Time Calculatorحاسبة الوقت
Add or subtract two durations in hours, minutes and seconds.أضف أو اطرح مدتين بالساعات والدقائق والثواني.
Enter durationsأدخل المدد
Resultالنتيجة
Adding and subtracting time correctly
إضافة وطرح الوقت بشكل صحيح
Time arithmetic trips people up because it isn't base-10 — 60 seconds make a minute and 60 minutes make an hour, so you can't add durations the way you'd add plain decimal numbers. This calculator sidesteps that entirely by converting both durations into total seconds first, performing the addition or subtraction on those plain numbers, then converting the result back into hours, minutes, and seconds for display.
That conversion step is what handles "carrying" correctly: if you add 45 minutes to 40 minutes, the calculator doesn't show "85 minutes" — it converts to seconds, adds, and converts back, correctly showing 1 hour 25 minutes. The same logic applies to subtraction; if the second duration is larger than the first, the result is negative, and the calculator displays a minus sign in front of the hh:mm:ss output rather than showing a nonsensical time.
This tool is meant for pure duration math — adding up chunks of elapsed time, like combining several workout segments, tallying video or audio clip lengths, or figuring out total practice time across sessions. If you instead need to know the number of hours worked between a start and end clock time (like 9:00 AM to 5:30 PM), the dedicated Hours Calculator on this site handles that clock-time scenario more directly, including break deductions.