Time Calculator
Calculate total time by adding or subtracting hours, minutes and seconds, or find the time after a duration with this free online time calculator.
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How to use Time Calculator
- 1Choose Add / subtract durations or Time from a clock time
- 2Enter days, hours, minutes and seconds, adding as many rows as you need and toggling + or −
- 3Read the total as hh:mm:ss, decimal hours and minutes, or the resulting clock time, then copy it
Frequently asked questions
How do I add hours and minutes together?▾
Add each duration as a row. The calculator carries every 60 seconds into a minute and every 60 minutes into an hour, so 2:45 plus 1:30 gives 4:15.
How do I convert minutes to decimal hours?▾
Divide the minutes by 60: 4 hours 15 minutes is 4.25 hours. The result box shows decimal hours automatically, which is handy for timesheets.
Can it tell me what time it will be after a duration?▾
Yes. Switch to Time from a clock time, enter a start time and the hours and minutes to add or subtract, and it shows the time and whether it falls on another day.
Embed Time Calculator on your website▾
Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.