Hours to Days Converter

About the h to d calculation

One hour is exactly 0.041667 days, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Sixty minutes, or 3,600 seconds. The basis of timekeeping and of most pay calculations. Twenty-four hours, or 86,400 seconds — one full rotation of the Earth relative to the Sun.

Formula

d = h × 0.041667

1 h = 0.041667 d
1 d = 24 h

Worked example

To convert 24 h, multiply by 0.041667: 24 × 0.041667 = 1 d.

Frequently asked questions

How many days are in a hour?

There are 0.041667 days in one hour. To convert any amount, multiply the number of hours by 0.041667.

How do I convert days back to hours?

Divide instead of multiplying, or equivalently multiply by 24. One day is 24 hours.

Is this conversion exact?

For seconds through weeks, yes — they are fixed multiples. The year is the mean Gregorian year of 365.2425 days, which is an average rather than the length of any particular calendar year.

Where is each of these units used?

Hours: sixty minutes, or 3,600 seconds. The basis of timekeeping and of most pay calculations. Days: twenty-four hours, or 86,400 seconds — one full rotation of the Earth relative to the Sun.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units