Time calculator
Add or subtract durations — days (optional), hours, and minutes. Handy for timesheets, travel buffers, and deadline math. Everything stays in your browser — files are not uploaded to our servers for processing.
Tool processing runs in your browser — your numbers/inputs are not uploaded to our servers for processing.Details
Starting time
Second time
Result
4h 15m
255 minutes total · 4.25 decimal hours
Embed this calculator
Paste this iframe on your site. Includes a backlink to Time Calculator. Opens chrome-less with ?embed=1.
Frequently asked questions
How do I add hours and minutes?
Convert everything to minutes, add (or subtract), then convert back. Example: 2h 45m + 1h 30m = 4h 15m. Optional days count as 24 hours each.
Can the result be negative?
Yes, if you subtract more time than you started with. The result shows a minus sign with the absolute duration.
Is this the same as the hours calculator?
No. The hours calculator finds the gap between two clock times (e.g. shift length). This tool adds or subtracts durations you enter.
Is my data uploaded?
No. TryCalculatingNow runs entirely in your browser. Your numbers are not uploaded to our servers for processing.