Hours in a Day, Week and Year

- November 04, 2026

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Hours in common calendar periods

Period	Hours
1 civil day	24
7-day week	168
365-day common year	8,760
366-day leap year	8,784

Estimate annual work hours

Scheduled hours per week

Working weeks per year

Calendar totals use 24 hours per day. A local day during a daylight-saving change can contain 23 or 25 elapsed hours.

How many hours are in a day?

A standard civil day contains 24 clock hours. However, in a location that changes its clocks, the elapsed duration between one local midnight and the next can occasionally be 23 or 25 hours.

Hours in a week

Seven days contain 7 × 24 = 168 hours. A 40-hour work week is a schedule, not the full number Of calendar hours in a week.

Hours in a year

A 365-day common year contains 8,760 hours. A 366-day leap year contains 8,784 hours. These are calendar totals based on 24 hours per day; local daylight-saving transitions can affect elapsed-time calculations between zoned timestamps.

Annual work hours

Multiply scheduled weekly hours by the number of working weeks. For example, 40 hours across 52 weeks is 2,080 scheduled hours. Subtract holidays, leave or other non-working time separately when you need an estimate of hours actually worked.