Sleep Debt Calculator: How Much Sleep Do You Owe This Week?
Enter how many hours you need and how long you actually slept on each of the last 7 nights to see your weekly sleep debt.
- Nothing you type is stored
- Free
- No signup
Your sleep debt this week
5:30hours
High sleep debt- Total slept
- 50:30 hours
- Average per night
- 7:13 hours
- Nights below your need
- 5
An estimate for general information, not medical advice.
Catch up gradually: go to bed 30–60 minutes earlier for a few nights rather than one long lie-in.
Night by night
| Night | Hours slept | vs need |
|---|---|---|
| 1 | 6.5 | −1.5 |
| 2 | 7 | −1 |
| 3 | 6 | −2 |
| 4 | 6.5 | −1.5 |
| 5 | 7 | −1 |
| 6 | 8.5 | 0.5 |
| 7 | 9 | 1 |
How to use
- Enter how many hours of sleep you need (7–9 for most adults).
- Enter the hours you slept each night for the last week.
- See your total debt, average and short nights.
Good to know
Sleep debt = (hours needed × 7) − total hours slept. Longer nights pay back some of it. Example: needing 8 hours but sleeping 50.5 hours in a week leaves a debt of 5.5 hours.
A weekend lie-in helps a little but does not fully undo a week of short sleep, and can shift your body clock. Adding 30–60 minutes a night (an earlier bedtime) for several days is a gentler way to catch up.
Use quarter hours for partial hours (7.25 = 7 h 15 min). If you regularly cannot get enough sleep, have trouble falling asleep, or feel very sleepy in the day despite enough time in bed, talk to a doctor.
Questions
What is sleep debt?
The difference between the sleep you need and the sleep you got, added up over several nights.
Can I pay back sleep debt on the weekend?
Partly. Long lie-ins can upset your schedule; adding an extra 30–60 minutes a night for a few days works better.
How many hours do I need?
Most adults need 7–9 hours. If you wake up refreshed without an alarm on holidays, that amount is a good guide.
Is a sleep debt of 10 hours a week bad?
It is large: like losing well over a full night. Over time it can hurt mood, focus and health.
Is my data saved?
No. Everything is calculated on your device.