Hours to minutes converter, from whole hours to decimal hours.

To convert hours to minutes, multiply the hours by 60. So 2 hours is 120 minutes, 90 minutes is 1.5 hours and 8 hours is 480 minutes. The same rule works for decimal hours. 1.75 hours × 60 = 105 minutes, which is 1 hour 45 minutes.

How to use the converter

1. Type the amount in the Hours (h) box. A decimal such as 2.5 or a fraction such as 3/4 works.
2. The big result shows Minutes (min). Use Decimals in the side column to fix the number of places.
3. The cards under the result show the same time in other forms. Hours and minutes shows a decimal hour as a clock time.
4. Type in the second box, or press the swap button, to go the other way.
5. Click a row in Common values to load it. Copy result, Copy link, Copy table and Print chart keep the answer. Start again resets the box.

What a decimal hour means in minutes

Time sheets and project tools often store time in tenths and hundredths of an hour. The table shows what those parts are worth in minutes. One tenth of an hour is 6 minutes, and one hundredth is 0.6 minutes, or 36 seconds.

Whole hours in minutes

Worked examples

• A 2.5 hour class. 2.5 × 60 = 150 minutes.
• A flight of 7 hours 20 minutes. Turn 7 hours into 420 minutes and add 20. The total is 440 minutes. In decimal hours that is 7.3333.
• An 8 hour shift with a 45 minute break. 8 × 60 = 480 minutes. Take off 45 and you have 435 minutes of work, which is 7.25 hours.
• 0.33 hours. 0.33 × 60 = 19.8 minutes, a little under 20 because 0.33 is a rounded third.
• Back the other way. 210 minutes ÷ 60 = 3.5 hours. Press the swap button and type 210.

Where the numbers come from

A minute is 60 seconds, an hour is 3,600 seconds and a day is 86,400 seconds. NIST SP 811, Appendix B.9 prints all three as exact factors. Checked 27 Oct 2026. The converter keeps them as exact fractions and rounds only the last digit shown.

Mistakes to avoid

The most common slip is reading 1.5 hours as 1 hour 50 minutes. The part after the point is a fraction of an hour. Half an hour is 30 minutes, so 1.5 hours is 1 hour 30 minutes, or 90 minutes. A second slip is rounding a third of an hour to 0.3. That is 18 minutes, not 20.

It also helps to know how a decimal splits. Each 0.1 of an hour is 6 minutes and each 0.01 is 36 seconds. So 0.45 hours is 27 minutes, which is 27 minutes. If a log shows 0.45 and you read it as 45 minutes, you are off by 18 minutes.

Related pages: Minutes to hours, Hours to seconds and the hours calculator for time cards.