About our sleep-planning tools

Bedtime Calculator brings three everyday sleep-planning questions together. Use a tool for the time math, then read a focused guide when you need to understand the result.

Choose the tool for your question

• Bedtime Calculator: work backward from a required morning alarm.
• Wake-Up Time Calculator: compare alarms from a bedtime you already know.
• Sleep Debt Calculator: compare up to seven nights of sleep with your nightly target.

Clear estimates, useful next steps

The timing tools use approximate 90-minute blocks and an adjustable fall-asleep allowance. The sleep-debt tool totals reported sleep against a target you choose. Our methodology explains the formulas and limits.

These tools cannot measure sleep stages, determine your exact sleep need, or diagnose a sleep problem. Getting enough sleep comes before matching an estimated cycle boundary.

Guidance you can check

Our sleep planning guides answer specific questions with examples and sources. The editorial team checks clarity and sourcing; we do not claim clinical review. See our editorial standards and corrections process.

No account needed

Calculations run in your browser. Timing tools remember your clock settings and entered times locally; sleep-debt entries are not saved between visits. Our privacy policyexplains browser storage, shared links, and this website's use of Google Analytics.

Contact

Send questions or feedback to support@bedtimecalculator.rest.