Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Weekly Sleep Debt Calculator

Compares the sleep you need each night with the sleep you actually get and totals the shortfall across a week. The result is your accumulated sleep debt — the number of hours you owe your body over seven days.

Sleep You Need Per Night (hours)

Sleep You Actually Get Per Night (hours)

Sleep

Sleep Cycle Calculator

Find your ideal bedtime by working backward from your wake-up time in complete 90-minute sleep cycles. Waking at the end of a cycle (rather than mid-cycle) leaves you feeling more refreshed than the same total hours timed less carefully.

Desired Wake Time (hours (24h format))

Number of Sleep Cycles (cycles)

Key differences

	Weekly Sleep Debt Calculator	Sleep Cycle Calculator
Category	Sleep	Sleep
Inputs required	2	2
Result	Weekly Sleep Debt (hours)	Optimal Bedtime (hours)
What it does	Compares the sleep you need each night with the sleep you actually get and totals the shortfall across a week. The result is your accumulated sleep debt — the number of hours you owe your body over seven days.	Find your ideal bedtime by working backward from your wake-up time in complete 90-minute sleep cycles. Waking at the end of a cycle (rather than mid-cycle) leaves you feeling more refreshed than the same total hours timed less carefully.