Time duration calculator
Find the time between two moments, add or subtract time, or add up a timesheet. Everything updates live — nothing is uploaded.
Start time
End time
Start date (optional)
End date (optional)
—Duration
—Decimal hours
—Total minutes
Base time
Hours
Minutes
Seconds
—Result time
0:00Total
Everything runs in your browser. No upload, no sign-up.
How it works
STEP 1
Pick a mode
Duration between two times, add or subtract time, or sum a list of durations.
STEP 2
Enter the times
Use 24-hour HH:MM. Crossing midnight is handled automatically.
STEP 3
Read the result
Hours and minutes, decimal hours and total minutes — all private, nothing leaves your device.