Tooloolis691

🧮 Calculator Tools (244)

The biggest collection on Toololis: calculators for health markers, life decisions, time and dates, percentages and everything in between. Use the filter pills to jump to a topic. Every tool states its sources and limitations — honesty over engagement bait.

🧮

Calculator

244 tools · all client-side

Age Calculator

Calculate exact age in years, months, days, hours

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BMI Calculator

Body Mass Index — metric and imperial

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Tip Calculator

Calculate tips and split bills between people

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Temperature Converter

Celsius ↔ Fahrenheit ↔ Kelvin — instant

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Length Converter

Meters, feet, inches, kilometers, miles and more

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Weight Converter

Kilograms ↔ pounds ↔ ounces ↔ grams

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Countdown Timer

Count down to any date or time — live

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Calorie Calculator (TDEE)

Daily calorie needs using Mifflin-St Jeor formula

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Compound Interest Calculator

See how money grows over time — with monthly contributions

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Solar Panel ROI Calculator

Payback period + lifetime savings of solar panels

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EV vs Gas Cost Calculator

Compare 5-year total cost: electric vs gasoline car

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Carbon Footprint Calculator

Estimate your annual CO2 emissions

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Intermittent Fasting Timer

Track 16:8, 18:6, OMAD, 5:2 — all protocols

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Macro Calculator

Protein, carbs, fat for your fitness goal

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A/B Test Significance Calculator

Is your A/B test result statistically significant?

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Timezone Meeting Finder

Find a time that works for global teams

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Schengen 90/180 Calculator

Track Schengen Area stays for digital nomads

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Scientific Calculator

Full scientific calculator — trig, log, exp, memory

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Area Calculator (All Shapes)

Area of rectangle, circle, triangle, polygon + more

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Cooking Conversion Calculator

Cups to ml to tbsp to oz — all cooking units

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Pool Volume Calculator

Gallons or liters for any pool shape

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Pythagorean Theorem Calculator

a squared plus b squared equals c squared

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Circle Calculator

Radius, diameter, circumference, area from any input

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Fraction Calculator

Add, subtract, multiply, divide fractions

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Roman Numerals Converter

Convert numbers to Roman and back

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Dog Age Calculator

Convert dog age to human years (breed-aware)

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Running Pace Calculator

Pace, time, distance — all three connected

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Concrete Volume Calculator

Cubic yards or meters plus bags of cement

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Paint Calculator

Gallons or liters needed for any room

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BTU Calculator (AC Heater Sizing)

AC or heater BTU needed for any room

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Wire Size AWG Calculator

AWG size for any current, distance, voltage drop

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Voltage Drop Calculator

Voltage loss over wire length

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Ohms Law Calculator

V = I times R — solve for any of the three

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Fuel Economy Calculator

MPG, L per 100km, km per L + trip cost

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Tire Size Calculator

Compare two tire sizes — diameter, speedo error

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Periodic Table Interactive

Click any element — atomic data, properties, uses

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Molar Mass Calculator

Molecular weight from any chemical formula

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Chemical Equation Balancer

Auto-balance any chemical reaction

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Volume Calculator (3D Shapes)

Cube, cylinder, sphere, cone, pyramid, prism

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Trigonometry Calculator

sin, cos, tan + inverse functions

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Pregnancy Due Date Calculator

Due date + week-by-week trimester

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Quadratic Equation Solver

Solve ax squared + bx + c = 0

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Right Triangle Solver

All sides and angles from any 2 inputs

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Standard Deviation Calculator

sigma, variance, mean, median for any dataset

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ABV Calculator (Brewing)

Alcohol by volume from OG and FG readings

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Stair Calculator

Rise, run, stringer length for any staircase

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Tile Calculator

Tiles + waste needed for any floor/wall

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Roofing Calculator

Shingle bundles and square footage for your roof

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Lumber Board Feet Calculator

Board feet from length, width, thickness

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Flooring Calculator

Boxes of flooring needed for any room

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Drywall Calculator

Sheets, screws, mud, tape for any room

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Deck Calculator

Joists, deck boards, footings for any deck

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Fence Calculator

Posts, panels, rails, concrete for any fence

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Gravel / Mulch Calculator

Cubic yards of gravel, mulch, or topsoil

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Wallpaper Calculator

Rolls of wallpaper for any room

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Torque Calculator

Torque = Force × Distance (N·m, ft·lb)

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Bolt Torque Calculator

Torque spec for any bolt grade + size

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Gear Ratio Calculator

Ratio, speed, torque across gear sets

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Belt Length Calculator

V-belt or timing belt length from pulley geometry

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Stress / Strain Calculator

σ = F/A, ε = ΔL/L, Young’s modulus

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Tap Drill Size Chart

Pilot hole size for any tap thread

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Cutting Speed Calculator

RPM from surface speed and tool diameter

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Resistor Color Code Calculator

4, 5, 6 band resistor color → value

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LED Resistor Calculator

Current-limiting resistor for any LED

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Battery Capacity (Ah to Wh)

Convert between Ah, Wh, mAh, runtime

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kW / kWh / HP Converter

Power units — watts, kilowatts, horsepower

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Series / Parallel Resistance

Combined resistance of any resistor network

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Motor Power Calculator

Electric motor power, current, efficiency

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Force Calculator (F=ma)

Newton’s second law — force, mass, acceleration

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Density Calculator

ρ = m / V — mass, volume, density any two

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Projectile Motion Calculator

Trajectory, range, time-of-flight, max height

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Kinetic / Potential Energy

KE = ½mv², PE = mgh — energy calculations

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pH Calculator

pH from [H⁺] concentration, pOH, pKa/pKb

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Molarity Calculator

Molarity = moles / liters — lab solution prep

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Dilution Calculator (C1V1=C2V2)

Stock to working concentration — lab dilutions

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Body Roundness Index (BRI)

BMI is outdated — BRI is 2024 science

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Personal Carbon Footprint Pro

Scope 1 + 2 + 3 with DEFRA factors

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Solar + Battery + Inverter Sizer

Complete off-grid system in one shot

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Heat Pump Room-by-Room Sizer

BTU per room with climate zone

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EV Range — Real Conditions

Temp + terrain + AC + age = honest range

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Insulation R-Value Loss Calculator

Heat loss + payback period for upgrades

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Beekeeping Hive Calculator

Honey yield + frames + winter survival

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Sous-Vide Time + Temp Calculator

Food safety × texture × thickness

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Kombucha Brew Timer

pH curve, sugar, second-fermentation

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Sourdough Hydration + Timing

Bakers percentage, fermentation timing

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Pizza Dough Hydration Calculator

Neapolitan, NY, Roman — different math

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Cocktail Dilution Calculator

Stir time, ice melt, target ABV

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BBQ Smoking Wood Calculator

Wood × meat × time = perfect smoke

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TikTok Coin / Diamond Calculator

Live gifts → real € after Apple/Google cut

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YouTube AdSense by Niche

Real RPM data — not the inflated guess

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Twitch Sub Revenue Net Calculator

After Twitch cut + tax + payment fees

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Patreon Tier Pricing Optimizer

Psychological pricing for max conversion

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Shopify Real Profit Calculator

After ALL fees: Stripe + Shopify + apps + ads

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Stripe / Payment Fee Calculator

Cross-region fees + currency conversion

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Launch Day Master Audit

SEO + Perf + A11y + Security + Legal in 1

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Content Production Pipeline

Topic → Title → Desc → Tags in one flow

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AI Image Asset Pipeline

Prompt → Cost → Aspect → Size → CDN

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Compliance Master Stack

EU AI Act + GDPR + Cookies + ePrivacy in 1

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Video Production Stack

Story → Cost → Voice → Format

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AI Stack Real Cost Total

Models + Embeddings + Vector DB + Compute

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Personal Health Multi-Score

6 metrics from 1 input set: BMI/BRI/BMR/TDEE...

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SaaS Health Dashboard

ARR + churn + CAC + LTV + Magic Number

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Relocation Decision Calculator

City A → City B: full picture

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Marketing Budget Allocator

Auto-split: SEO/Ads/Content/Tools

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Metabolic Adaptation Calculator

Why diet stalls — TDEE drops 5–15% after weight loss

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Tolerance Stack-Up Analyzer

RSS + worst-case for assembly tolerance

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Sheet Metal Bend Allowance Calculator

K-factor, BA, BD — flat pattern length

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CNC Feed & Speed Optimizer

SFM, IPM, RPM — by tool + material

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Welding Heat Input Calculator

kJ/mm — voltage × current ÷ travel speed

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Pipe Pressure Drop Calculator

Darcy-Weisbach friction loss in pipes

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Engineering Material Property Lookup

Density, yield, modulus — 30+ common materials

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HRV Recovery Score Interpreter

Paste 7-day HRV — see recovery + readiness

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Sleep Debt Calculator

Cumulative sleep deficit over 14 days

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Glucose Spike Predictor per Food

GI + carbs + protein → spike estimate

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Hydration Needs Calculator (Climate-Aware)

Beyond "8 glasses" — body + climate + activity

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Vitamin D Sun Exposure Calculator

Latitude + season + skin = mins needed

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Activity to Steps Equivalent

Convert any activity to step-count equivalents

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Life Percentage Left Calculator

Brutal truth: how much of life remains?

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Hearing Age Test (Frequency Sweep)

Live audio — what age are your ears?

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Reaction Time vs Age Cohort

5-round test — how fast are your reflexes?

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Travel-Day Bundle (Mobile-First)

Visa + currency + plug + tip + roaming in one tap

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Heart Rate via Phone Camera

PPG via flash + camera — mobile-only, no wearable needed

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PHQ-9 Depression Self-Screen

Validated 9-question scale — score + crisis resources

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GAD-7 Anxiety Self-Screen

Validated 7-question generalized anxiety screen

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Burnout Self-Screen (Oldenburg)

Exhaustion + disengagement — 16 items

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ADHD ASRS Adult Self-Screen

WHO-validated 6-item ADHD screening

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STOP-BANG Sleep Apnea Screen

Validated 8-question sleep apnea risk

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ACE Childhood Trauma Score

10-question Adverse Childhood Experiences

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Carbon Decision Impact Ranker

Which lifestyle change cuts most CO2? Ranked by impact

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Paris 1.5°C Personal CO2 Budget

Your share of remaining global carbon budget

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Meal Carbon Tracker

CO2 per meal — beef vs chicken vs plant

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Flight vs Alternative CO2

Train, bus, EV, video-call alternatives

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Home Renovation CO2 Payback

Insulation/heat-pump CO2 break-even years

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Secondhand vs New Impact

Clothes, electronics, furniture CO2 saved

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EU vs China EV Comparator

BYD/NIO vs VW/BMW — tech, software, price honest

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EV Charging Time — Realistic

Real 10→80% with charge curve, weather, pre-conditioning

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EV Battery State-of-Health Predictor

SoH from age + cycles + charging habits

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V2G (Vehicle-to-Grid) ROI Calculator

Can your EV earn money as home battery?

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BEV vs PHEV vs Hybrid TCO

3-way 5-year cost comparison

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EV Charging Network Coverage Score

Tesla SC vs Ionity vs Allego — where you actually drive

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Motor Efficiency Class IE1-IE4 ROI

Premium efficiency motor lifecycle savings

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VFD Energy Savings Calculator

Variable Frequency Drive ROI for pumps/fans

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Three-Phase Motor Sizing Calculator

kW + V + cos φ + efficiency → current + protection

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Cable Sizing per IEC 60364

Voltage drop + ampacity + derating

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Heat Sink Thermal Calculator

Junction temp from thermal resistance R_θ

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PCB Trace Width Calculator (IPC-2221)

Current vs trace width vs temp rise

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Phone Performance Live Test

CPU + GPU + RAM benchmark in your browser

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Phone vs Cohort Benchmark

Your phone vs avg same-age devices

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Mobile Storage Smart-Cleanup Advisor

What to delete first for max GB freed

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Cooking Conversions (Precise per Ingredient)

100+ ingredients: cup ↔ g ↔ ml ↔ oz

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Recipe Substitution Helper

Out of eggs? Lemon juice? Get smart swaps

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Visa Requirements by Citizenship

Country pairs — visa-free, e-visa, embassy required

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Biological Age Clock

Phenotypic-age vs chrono-age — Levine 2018 formula

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VO2max Estimator (Live)

Phone-accelerometer step-test — Tecumseh / Cooper

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Zone 2 Heart Rate Calculator

Tanaka 208−0.7×age — personalized zones

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Resting HR Mortality Cohort

Copenhagen Male Study percentile

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Grip Strength Cohort Score

Sarcopenia early-warning + percentile

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Walking Speed Mortality Score

Self-time 4m walk → 10-year survival

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Fasting Protocol Optimizer

OMAD vs 16:8 vs 5:2 vs ADF — by goal

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Glucose AUC Estimator

Area-under-curve from peak + duration

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HOMA-IR Insulin Resistance

Fasting glucose × insulin / 405

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Sleep Architecture Score

Estimate REM/NREM proportions from self-report

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Cold Plunge Protocol ROI

Time + temp + frequency vs evidence-grade

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Sauna Protocol ROI

Finland-data: 50% CVD reduction at 4-7×/wk

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Supplement Stack ROI (Evidence-Graded)

A/B/C/D evidence rating + cost vs benefit

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Creatine Loading vs Maintenance

20g×7 vs 5g/day — time to saturation

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Vitamin D by Latitude (Deep)

Lat × skin × season → personalized IU target

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Omega-3 EPA/DHA Quality

Brand oxidation + form (TG/EE) + target

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NAD+ Supplement ROI (Honest)

Should you take NMN/NR? — evidence-based answer

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Longevity Protocol Composite Score

⭐ Multi-biomarker readiness — 0-100

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Am I Autistic? AQ-10 Test

Allison 2012 validated screening — 10 questions

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Phone Addiction Test (SAS-SV)

Smartphone Addiction Scale Short Version — Kwon 2013

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Loneliness Test (UCLA-3)

Hughes 2004 — 3-item validated loneliness scale

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Workaholic Test (Bergen Scale)

Andreassen 2012 — 7-item Bergen Work Addiction

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Procrastination Test (Lay PPS)

Lay 1986 — 20-item General Procrastination Scale

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Where Do I Stand? — Life Composite

⭐ Combine all self-tests into one big-picture score

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Step Count Percentile — vs Age Cohort

Where do your daily steps rank?

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Screen Time Cohort Truth

Your screen time vs your generation

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Reading Speed Live Test

Live browser test + cohort percentile

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Typing Speed Test + Cohort

Live WPM test with percentile vs age

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Pomodoro Timer

Focus timer with work & break intervals — track your productivity

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Online Stopwatch

Precise stopwatch with lap times — millisecond accuracy

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Parent-Child Time Left

How many times will you see your parents before they're gone? — life-math you avoid

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Lifetime Trash Tonnage

How many tons of waste will you produce in your lifetime?

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Lifetime Plastic Burden

You'll throw away the weight of a blue whale — in plastic alone

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Lifetime CO2 Budget Burn

Your 1.5°C carbon budget runs out in 7 years — here's yours

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Hidden Water Footprint

You use 4 million liters in your lifetime — half of which you can't see

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Lifetime Sit Time Truth

You'll sit on a chair for 30 years of your life — and pay for it

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Lifetime Sleep Debt

You owe your body 2 years of sleep — and counting

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Lifetime Sugar Tonnage

You'll eat 3 tons of sugar — the weight of 320 car tires

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Lifetime Email Time Cost

Email will eat 3+ years of your life — only counting your career

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Lifetime Fast Fashion Waste

4,800 garments bought, 1,440 actually worn — you waste the rest

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Life Audit — 7 Brutal Truths

Your entire life in 7 numbers — the screenshot that recalibrates you

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Date Nights Left With Partner

Tim Urban-style math for couples — a humbling number

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Friendship Decay Calculator

At current contact rate — when do friendships effectively die?

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Lifetime Toilet Time

92 days of your life — sitting on a toilet. Plus phone-bonus.

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Lifetime Notifications Received

3.4 million pings in your lifetime — your brain pays the price

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Lifetime Phone Replacement Carbon

15 phones, 1.1 tons CO2 — only from upgrading

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Worrying Hours Lifetime

85% of what you worried about never happened — here's the time cost

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Comparison-Envy Hours

Hours scrolling, comparing, feeling worse — over your remaining life

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Stairs vs Elevator Lifetime

Years gained from taking the stairs — positive lifetime math

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Anger Outbursts Lifetime

Hours fuming + relationships strained — the cumulative life-cost

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Books Read Lifetime

Positive math — knowledge gained, hours read, lifetime library

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Walking Distance Lifetime

How far have your feet taken you — and how far they will

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Family Dinners Left

How many family dinners do you have ahead — Tim Urban-style for families

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TV/Streaming Hours Lifetime

How many years of your waking life will Netflix consume?

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People-Pleasing Hours Lifetime

Hours saying yes when you meant no — the silent life-cost

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Self-Criticism Hours Lifetime

Time spent in negative self-talk — would you talk to a friend like this?

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Strangers Met Lifetime

Positive math — humans you'll briefly intersect with in your life

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Hugs Lifetime

How many hugs left — the warmest unit of human connection

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Meditation Hours Lifetime

Positive lifetime: hours spent in quiet — and what they buy you

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Attachment Style Test

Secure / Anxious / Avoidant / Disorganized — Bowlby+Bartholomew

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Trauma Response Test (4F)

Fight / Flight / Freeze / Fawn — Pete Walker 4F framework

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Eldest Daughter Syndrome Quiz

Parentified, hyper-responsible, perfectionist — TikTok-viral therapy concept

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Am I Burnt Out?

Maslach 3-dim — exhaustion + cynicism + inefficacy

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Heart Age Calculator

Your cardiovascular age vs chronological — NHS QRISK-style

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Body Type / Shape Calculator

Apple, pear, hourglass, rectangle — health-relevant body shape

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Real Biological Age

Multifactor bio-age — sleep + steps + smoking + stress + diet

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Vitamin D Deficiency Self-Test

Symptoms + risk factors — likelihood you're D-deficient

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Real Sleep Need By Age

Your actual hours-need by age + chronotype + sleep-quality

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Real Water Need By Day

Beyond "8 glasses" — weight + activity + climate + caffeine

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Should I Quit Drinking?

AUDIT-C + lifestyle math — evidence-based decision frame

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Should I Have Kids?

Multidimensional decision matrix — finance + relationship + readiness

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Should I Delete Social Media?

Hours + mood + comparison — evidence-based decision matrix

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Box Breathing Timer

4-4-4-4 calm-down breath with a visual lung gauge — no signup, no audio

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4-7-8 Breathing Timer

Dr. Weil sleep-onset breath — 4 in, 7 hold, 8 out

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Coherent Breathing 5-5

6 breaths per minute — HeartMath HRV-maximizing breath

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Alternate Nostril Breathing

Nadi Shodhana — pranayama for nervous-system balance

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5-4-3-2-1 Grounding Tool

Anxiety grounding via the 5 senses — anti-panic, anti-overwhelm

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Cyclic Sighing Timer

Huberman Lab protocol — double inhale + long exhale, 5min for mood

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20-20-20 Eye Rule Timer

Every 20 min, look 20 ft / 6 m away for 20 sec — for screen workers

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Body Scan Meditation Timer

Guided body-scan visualization — feet to head, 5 minutes

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Pomodoro Focus Timer

Visual 25/5 pomodoro with set tracking — focus + breaks

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Tabata Timer

20s work / 10s rest × 8 rounds — the original 4-minute HIIT protocol

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Pour-Over Coffee Timer

V60 4-stage timer with visual dripper — bloom, pour, drawdown

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Visual Metronome + BPM Tap

Pulsing metronome with tap-to-detect-BPM — for musicians

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Sleep Cycle Calculator

Find the right bedtime — 90-min cycles, visual clock

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Contraction Timer

Tap-to-time labor contractions · 5-1-1 rule indicator · privacy-first

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Random Number Generator

Cryptographically secure random numbers — any range, with or without duplicates

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Dice Roller

Roll d4 to d100 — crypto-fair virtual dice for D&D and board games

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Coin Flip

Heads or tails — a truly fair 50/50, unlike a real coin

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Wheel Spinner

Spin the wheel to decide — names, dinner, anything · raffle mode

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Random Name Picker

Draw winners from any list — giveaway-fair, thousands of names

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Unit Converter

Length, weight, temperature, volume, area & speed — exact factors

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