Time Duration Calculator
How long is it from one time to another? Subtract two clock times and get the exact duration in hours and minutes.
A little clarity. A lot of time saved.
To find the time between two clock times, you subtract them - but borrowing minutes across the 60 boundary is where mental math slips. TCalc does true time subtraction: 13:05 − 08:47 correctly borrows and returns 4h 18m.
The result is a real duration you can keep calculating with: subtract a break, multiply it, or convert it to decimal hours, minutes, or seconds with one tap.
Real Examples
Duration between a start and end time.
Tricky minute borrowing handled correctly.
Duration minus a break in one expression.
The reverse question: what time is it 8 hours after 22:00?
Answers as you type
Both widgets live on the widgets page.
Frequently Asked Questions
How do I calculate the duration between two times?
Subtract the earlier time from the later one: 17:45 − 09:15 = 8h 30m. In TCalc you type it exactly like that and can subtract breaks in the same expression.
Can I see the duration as decimal hours?
Yes - TCalc has 15 output formats. Switch to the hours format and 8h 30m displays as 8.5h; minutes and seconds formats are one tap away too.
What about durations across midnight?
Split at midnight and add the parts (22:00 to 06:00 = 2h + 6h = 8h), or flip the question and add the duration to the start: 22:00 + 8h shows 6:00 AM the next day.