Sleep Debt Calculator — How Tired Are You Really?
Quick answer: Enter hours slept each night for the last week. See total debt, average, and how many days to recover.
Calculate your cumulative sleep debt over the last week. Sleep debt accumulates when you consistently sleep less than your body needs — the science says it doesn't fully reset on weekend lie-ins, so tracking the running total matters.
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Last reviewed: April 2026Report an error
Hours slept each of the last 7 nights
Moderate sleep debt
9.0 hrs owed
Average: 6.7 hr/night. Total debt: 9.0 hours. To recover, add 1 extra hour to your nightly target for ~9 days.
Avg per night
6.7 hr
Total debt
9.0 hr
Days to recover
9 days
Hours Slept vs Target
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How to Use This Sleep Debt Calculator
- 1Enter hours slept each of the last 7 nights.
- 2Set your recommended sleep target (typical 7-9 hours).
- 3Read your total debt and average.
- 4Plan to recover at +1 hour/night above target.
Frequently Asked Questions
- CDC and AASM recommend 7+ hours per night for adults 18-60. Some need 8-9 to feel rested. Most people who think they only need 5-6 hours are running a chronic deficit.
- Partly. Studies show recovering recent sleep debt over a few extra-long nights helps. Chronic long-term debt may permanently affect cognitive performance and mood.
- Even mild debt impairs memory, reaction time, decision-making, and immune function. Heavy debt is associated with weight gain, depression, and accident risk equivalent to legal intoxication.
- For ~95% of adults, no. Studies tracking cognitive performance under 6 hours show steady decline that the subject doesn't notice — you feel "fine" while performing measurably worse.
- A 20-minute nap can restore alertness without rebound grogginess. 90-minute naps capture a full sleep cycle. Both can offset modest debt, but neither replaces consistent night sleep.
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