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Time Duration Calculator

Add up a list of times, convert a duration between hours, minutes and seconds, and work out the hours between two clock times.

Runs in your browser · No uploads

Add up times

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Convert a duration

Time between two clock times

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  • Nothing leaves your device
  • No server-imposed size limits
  • No sign-up, no watermark
  • Free

How to add up hours and minutes

  1. Type one time per line, like 1:30, 45m or 2h 15m (start a line with − to subtract it).
  2. Read the total in hours:minutes:seconds and in decimal hours.
  3. Use the other sections to convert a duration or count the hours between two times.

Ways to write a time

You typeIt means
1:301 hour 30 minutes (or 1 minute 30 seconds, if you choose minutes:seconds)
1:30:151 hour, 30 minutes and 15 seconds
2h 15m2 hours 15 minutes
1.5hone and a half hours
45m, 90s, 3dminutes, seconds, days
-0:20subtract 20 minutes

Decimal hours

Timesheets and invoices often need hours as a decimal: 1 hour 30 minutes is 1.5 hours, and 1 hour 45 minutes is 1.75 hours (minutes ÷ 60). The total is shown both ways.

Frequently asked questions

What if a shift goes past midnight?

When the end time is earlier than the start time, the calculator counts it as the next day, so 22:00 to 06:00 is 8 hours.

Is anything sent anywhere?

No. The calculation happens in your browser as you type; nothing is sent anywhere.