Calculate accumulated sleep debt from nightly sleep deficit over a period of days
This is simple arithmetic (needed minus slept, times nights) for awareness only, not a clinical measure. Adults are advised to sleep at least 7 hours a night (AASM/SRS). Sleep debt is not repaid hour-for-hour, and chronic short sleep affects alertness and health. If you are persistently tired, talk to a doctor; do not drive when drowsy.
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No. Sleep Debt Calculator is free, with no signup required, and nothing you enter leaves your browser.
Sleep Debt Calculator is built on published formulas and reference ranges from established health sources. We revisit it periodically as guidance evolves; the "Last reviewed" date above shows when that last happened. If something looks wrong, tell us with the feedback button in the bottom-right corner.