See how much sleep you need for your age and calculate your sleep debt or surplus.
Enter your age and average sleep, then click Calculate
This free sleep calculator shows how many hours of sleep is recommended for your age based on National Sleep Foundation guidelines, and calculates your sleep debt (or surplus) by comparing your actual average nightly sleep against that recommendation over any number of days.
Enter your age to see your age group's recommended sleep range, then enter your average hours of sleep per night and the number of days you want to evaluate. The calculator compares your actual average against the midpoint of your recommended range and multiplies the difference by the number of days to estimate your total sleep debt (if you're sleeping less than recommended) or surplus (if you're sleeping more).
Anyone tracking whether they're getting enough sleep, parents checking recommended sleep for a child's age group, and people curious how a week of short nights adds up in total lost sleep hours.
Comparing actual sleep against your age-based recommendation
The calculator uses the midpoint of your age group's recommended range as a single target value for comparison.
Even a small nightly shortfall compounds significantly over a week or month.
The same formula captures both directions — sleeping less than recommended creates debt, sleeping more creates a surplus.
From your age to your total sleep debt
Type your age to see the recommended sleep range for your age group.
Type how many hours you actually sleep on an average night.
Enter the number of days you want to calculate sleep debt or surplus over.
See your recommended range and total sleep debt or surplus instantly.
A week of short nights for a 30-year-old adult
Based on National Sleep Foundation guidelines
| Age Group | Recommended Sleep |
|---|---|
| Newborn (0-3 months) | 14-17 hours |
| Infant (4-11 months) | 12-15 hours |
| Toddler (1-2 years) | 11-14 hours |
| Preschool (3-5 years) | 10-13 hours |
| School Age (6-13 years) | 9-11 hours |
| Teen (14-17 years) | 8-10 hours |
| Young Adult (18-25 years) | 7-9 hours |
| Adult (26-64 years) | 7-9 hours |
| Older Adult (65+ years) | 7-8 hours |
These are general population guidelines from the National Sleep Foundation — individual needs can vary somewhat within each range based on health, activity level, and genetics.
Where tracking sleep quantity matters
Quantify how much total sleep debt a demanding week has created.
Check recommended sleep for a child's specific age group.
Set a concrete extra-sleep target for the weekend after a short week.
See the real sleep cost of a demanding project or exam period.
Combine with NeftCal's Sleep Cycle Calculator to time your bedtime around sleep cycles too.
What this calculator does well, and where it has boundaries
Get an accurate picture of your sleep debt
Summary: This calculator shows your age-based recommended sleep range and quantifies your sleep debt or surplus over any period — free and instant. Pair it with the Sleep Cycle Calculator to also plan bedtime around 90-minute sleep cycles.
Common questions about sleep needs and sleep debt
Official references to complement this calculator
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