Deficit/night
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Sleep Debt Calculator
Missed sleep last night? This week? See your total sleep debt — and whether you can realistically pay it back.
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Sleep debt accumulated
Total deficit
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Payback nights
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Severity
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What sleep debt means
Sleep debt accumulates when you sleep less than your body needs. Research shows that while you can partially catch up by sleeping longer on weekends, chronic debt causes cognitive decline, metabolic disruption, and weakened immunity. Recovery is linear: about 1 hour of extra sleep per 1 hour of deficit, spread across several days.
About the Sleep Debt
Accumulate your sleep deficit over time and see how much catch-up sleep you need to feel rested again. The tool runs entirely in your browser, so nothing you enter is uploaded or stored.
How to use the Sleep Debt
- Your ideal sleep per night (hours) — your your ideal sleep per night in hours.
- Days to calculate — enter your days to calculate.
- Average actual sleep (hours/night) — your average actual sleep in hours/night.
For general information only, not medical advice — see our disclaimer.
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