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Sleep Debt Calculator

Cumulative sleep deficit over 14 days

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Learn more — how it works, FAQ & guide
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Cumulative Sleep Debt Calculator

Track 14-day sleep debt vs personal need. See cumulative deficit, equivalent cognitive impairment, recovery time. Beyond "8 hours" myth.

How to use this tool

  1. 1

    Set sleep need

    Personal need (not population avg).

  2. 2

    14-day sleep log

    Hours per night, comma-separated.

  3. 3

    See cumulative debt

    And recovery time needed.

Frequently Asked Questions

Can I "pay back" sleep debt?
Partially. Research (Walker, Why We Sleep): chronic 6h/night for 10 days = same impairment as 24h awake. Recovery sleep helps but not 1:1. Lost cognitive performance is permanent in part.
Do weekends help?
Some. "Social jet lag" (sleeping 9-10h Sat/Sun) recovers ~30% of weekly debt. But disrupts circadian — Monday is worst day for crash. Better: consistent schedule.
Individual sleep need?
Genetic + age + lifestyle. Most adults: 7-9h. ~5% are short sleepers (DEC2 gene mutation). Best test: 2 weeks vacation, sleep until natural wake — that's your real need.

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.