Days to Hours

Multiply by 24. This one is exact and needs no table — but the reason people look it up is usually a deadline or a billing period, so the rows below cover the intervals that come up: a working week, a fortnight, a thirty-day month, a quarter and a year.

One caution. A calendar day is not always 24 hours. Where daylight saving applies, one day a year is 23 hours and another is 25, so an interval that crosses a clock change is out by an hour. For anything contractual, count the actual timestamps rather than multiplying.

The formula

hours = days × 24

Days to Hours table

Days	Hours
1	24
2	48
5	120
7	168
14	336
30	720
90	2160
180	4320
365	8760