Voltti
Free tool

Hours and minutes calculator
to add up time.

Add or subtract as many durations as you need. Get the total in hours and minutes, decimal hours and total minutes, and multiply it if you want. No signup.

Minutes over 59 carry over, so 90 minutes counts as 1h 30m. Hours can be decimals, like 1.5.

Total0h 00m0:00
Decimal hours0.00hours
Total minutes0minutes
Stop guessing

Stop adding up your hours by hand.

If the times you add up are hours at your computer, Voltti adds them for you. It counts the real minutes in every app and work website on Mac and Windows, with no timer to start or stop, and gives you daily and weekly reports with the totals already done.

Download for Mac Download for Windows

Free · macOS 13 or later · Windows 10 and 11

How it works

How to add hours and minutes.

  1. Add the hours and the minutes separately. 2h 45m + 1h 30m + 0h 50m gives 3 hours and 125 minutes.
  2. Carry every 60 minutes into an hour. 125 minutes is 2 hours and 5 minutes, so the sum is 5h 05m.
  3. Take away anything you need to subtract. Taking off a 20 minute break leaves 4h 45m. If the minutes run short, borrow 60 from the hours first.
  4. Convert to decimal if you need it. Divide the minutes by 60. 45 minutes is 0.75, so 4h 45m is 4.75 hours, or 285 minutes.

Example: that is the sample filled in above. Set the multiplier to 5 and you get 23h 45m, the same task done on 5 days.

This adds up lengths of time, not clock times. To find how long it is from 9:15 AM to 5:40 PM, use the time duration calculator. To total a week of shifts with breaks, use the work hours calculator.

Reference

Minutes to decimal hours.

Timesheets and invoices often want decimal hours. Divide the minutes by 60, or use this chart.

MinutesDecimal hours
50.08
100.17
150.25
200.33
250.42
300.50
350.58
400.67
450.75
500.83
550.92
601.00
FAQ

Hours and minutes, answered.

How do I add hours and minutes together?

Add all the hours, then add all the minutes. Every 60 minutes makes one more hour. 1h 40m + 2h 35m is 3 hours and 75 minutes, which is 4h 15m. Type each one into a row above and the total updates as you go.

How do I subtract hours and minutes?

Switch a row to minus. If you take more minutes than you have, borrow an hour: 5h 10m minus 1h 30m is 4h 70m minus 1h 30m, which is 3h 40m.

What is 1 hour 45 minutes in decimal?

1.75 hours. 45 minutes divided by 60 is 0.75. The chart above lists the common values, and the calculator shows decimal hours for any total.

Can the total be negative?

Yes. If you subtract more than you add, the total shows with a minus sign, like -0h 30m.

What is the multiply field for?

It repeats the total. If a task takes 1h 20m and you do it 6 times, enter 1h 20m and multiply by 6 to get 8h 00m. It works with decimals too, like 1.5.

Is my data saved anywhere?

Your rows stay in your browser so they're still there when you come back. Nothing is sent to a server.

Is there a way to track my hours automatically?

If you work on a computer, yes. Voltti for Mac and Voltti for Windows record every real minute in your apps and work websites, with no timer to start or stop. The free plan includes automatic tracking.