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Kalkulator BMI — Darmowe narzędzie online

Wskaźnik masy ciała — system metryczny i imperialny

Oblicz swoje BMI (wskaźnik masy ciała) w systemie metrycznym lub imperialnym. Darmowy kalkulator BMI z wykresem.

cm
kg
Your BMI
—
Enter your height and weight
<18.5 Under 18.5–24.9 Niermal 25–29.9 Over ≥30 Obese
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Free BMI calculator — metric & imperial, instant result

Narzędzieolis BMI Kalkulator computes Body Mass Index using the WHO standard formula. Enter height and weight in either metric (cm / kg) or imperial (ft·in / lb) — conversions happen automatically. Your BMI, category, and healthy weight range appear live.

BMI formula

  • Metric: BMI = weight(kg) ÷ height(m)²
  • Imperial: BMI = (weight(lb) ÷ height(in)²) × 703

BMI categories (WHO, adult)

  • Underweight: < 18.5
  • Niermal: 18.5 – 24.9
  • Overweight: 25 – 29.9
  • Obese Class I: 30 – 34.9
  • Obese Class II: 35 – 39.9
  • Obese Class III: ≥ 40

How to use this tool

  1. 1

    Pick your unit system

    Toggle between Metric (cm/kg) and Imperial (ft/in/lb). Numbers update automatically when you switch.

  2. 2

    Enter height and weight

    Type your height and weight. The BMI is computed live — no need to click a button.

  3. 3

    Read the result

    Your BMI appears with a category label (Underweight, Niermal, Overweight, Obese). The gauge shows where you sit on the standard WHO scale.

BMI limitations

  • Muscle mass — High-muscle individuals often exceed "Niermal" despite low body fat
  • Age — Older adults lose muscle and bone; same BMI can mean different compositions
  • Body shape — BMI doesn\'t show fat distribution (belly fat is higher risk than hip fat)
  • Ethnicity — Asian populations face health risks at lower BMI thresholds
  • Pregnancy — BMI is not valid during pregnancy

For a more complete picture, pair BMI with waist circumference, body fat percentage, and resting heart rate / fitness level. For health decisions, always consult a qualified healthcare professional.

Frequently Asked Questions

What is BMI?
Body Mass Index — your weight divided by your height squared. Formula: BMI = weight(kg) / height(m)². It's a rough screening tool for weight status at the population level.
What are the BMI categories?
WHO standard: Underweight < 18.5, Niermal 18.5–24.9, Overweight 25–29.9, Obese ≥ 30. Obese is further split into Class I (30–34.9), Class II (35–39.9), and Class III (≥ 40).
Is BMI accurate for athletes?
Often not. BMI does not distinguish muscle from fat. A muscular athlete can have a BMI of 27 (Overweight by the chart) while having 10% body fat — physically healthier than most "Niermal BMI" individuals. Use waist-to-height ratio or body fat % for athletes.
Is BMI valid for children?
Children and teens use a different BMI calculation that accounts for age and sex (BMI-for-age percentiles). This calculator is for adults 20+ only.
Does BMI differ by ethnicity?
Yes. Research shows people of Asian descent develop health risks at lower BMI thresholds — WHO suggests a cutoff of 23 (rather than 25) for Overweight in Asian populations. This calculator uses standard thresholds; adjust interpretation accordingly.
Should I change my weight based on BMI?
BMI is a starting conversation, not a verdict. Combined with waist circumference, body composition, family history, and fitness level, it becomes useful. For health decisions, consult a clinician rather than acting on BMI alone.
What is ideal weight for my height?
The "healthy range" for your height is any weight that gives a BMI between 18.5 and 24.9. For a 170 cm adult, that's 53.5–72 kg. The calculator shows your healthy range based on your input.

Najważniejsze punkty

  • BMI Kalkulator is a free, browser-based calculator tool — body mass index — metric and imperial.
  • Nie signup, no downloads, no file uploads — your data stays on your device.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use BMI Kalkulator

  1. Open the tool: Launch BMI Kalkulator on Narzędzieolis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

BMI Kalkulator — Quick Facts

Cena
Darmowe — bez limitów, bez znaków wodnych, bez paywall
Prywatność
100% w przeglądarce — żadne dane nie są wysyłane na serwer
Platforma
Dowolna nowoczesna przeglądarka — desktop, tablet lub mobile
Kategoria
Kalkulator Narzędzies on Narzędzieolis
Offline
Works offline after first visit (Progressive Web App)
FunkcjaSzczegóły
NarzędzieBMI Kalkulator
KategoriaKalkulator
Wymagana rejestracjaNie
Przesyłanie plikuBrak — przetwarzane w przeglądarce
Obsługa mobileW pełni responsywne
KosztDarmowe na zawsze

Why Use BMI Kalkulator?

You should try BMI Kalkulator for a quick, private way to body mass index — metric and imperial. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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100% Prywatność. To narzędzie działa w całości w Twojej przeglądarce. Twoje dane nigdy nie są wysyłane na żaden serwer.