What this calculator does
Sleep debt tracker works out cumulative sleep shortfall over several nights against a target amount of sleep. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaSleep debt = Σ(target hours − actual hours) across the nights logged
The inputs explained
| Field | What to enter |
|---|---|
| Target sleep per night (hours) | A number, measured in hours. Starts at 8. |
| Hours slept each night (comma-separated) | A list of numbers, separated by commas or spaces. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with target sleep per night
Every other input is held at the calculator’s starting values while target sleep per night varies. Select any row to load that scenario into the calculator.