Sleep Hours Calculator
Compares your nightly sleep with what your age band needs and works out the sleep debt you build over a set number of nights.
Recent
Formula
How the calculation works
The tool sets the nightly target from your age band, since children, teens, adults and seniors need different amounts of sleep.
The debt per night is the target minus the hours you actually sleep, and it never goes below zero because oversleeping is not counted as credit.
An adult target of 8 hours against 6 hours actually slept gives 2 hours of debt a night, which is 14 hours across a week.
Common mistakes
- Counting a weekend lie in as full repayment is wrong, because the body does not recover the whole shortfall in one long sleep.
- Using an adult target for a teenager understates the need, since adolescents generally need close to nine hours a night.
When to use it
- Use it to see how much sleep you are losing each week before the shortfall starts affecting mood and focus.
- Use it to set a realistic bedtime once you know the nightly gap you need to close.
Worked example
An adult needing 8 hours who sleeps 6 hours builds 2 hours of debt a night, which is 14 hours over a week.
Common questions
Can a long weekend sleep repay the whole debt?
No. A single long sleep helps but rarely clears a large accumulated debt, so steady nightly sleep is the reliable way to close the gap.
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