Calculate a total from multiple durations, subtract elapsed times or convert between hours and minutes in your browser.
01 / CALCULATION MODE
02 / TIME VALUES
Minutes and seconds in duration rows may exceed 59; they are normalized automatically. Subtraction takes every later row away from the first and can return a negative time. Decimal and total-minute conversions round to the nearest whole second.
03 / YOUR RESULT
04 / FORMULA
Each duration is converted to whole seconds before addition or subtraction. Decimal hours = seconds ÷ 3,600; total minutes = seconds ÷ 60. A negative result means the subtracted durations exceed the first one.
All time calculations stay in your browser.
Enter the values you want to compare; processing happens in your browser.
Adjust optional settings and review validation feedback before relying on the estimate.
Review the formulas and equivalent values, then copy the result you need.
Choose addition, subtraction or a conversion mode. Enter whole hours, minutes and seconds, signed decimal hours or signed total minutes, then review normalized time.
Up to twenty duration rows, signed subtraction results, normalized overflow minutes and seconds and transparent decimal-hour equivalents.
Duration values are calculated in browser memory only; no time entries are uploaded or stored.
Enter at least two duration rows, then select Add times. Durations are converted to seconds, added and displayed as normalized hours, minutes and seconds.
Yes. Select Subtract times; the calculator subtracts each later row from the first and shows a negative duration if the result is below zero.
Yes. Whole minutes and seconds in duration rows can exceed 59; the result carries excess values into minutes or hours automatically.
Select Time to decimal hours and enter one duration. Decimal hours equal the total seconds divided by 3,600.
Select Decimal hours to time or Total minutes to time. The amount is converted to seconds and rounded to the nearest whole second.
No. Time arithmetic and conversions run locally in your browser; entries are not uploaded or stored.