Duration Converter
Convert between hours, minutes, seconds and total values in either direction.
Results
Video editors, runners, musicians and developers constantly need to convert between hours:minutes:seconds and flat totals. A 1h 30m 45s video is exactly how many seconds for a progress bar? A race time of 5,445 seconds is how many hours and minutes? This tool converts in both directions instantly.
Explore all our countdown and duration calculator tools, or browse the full time and date converters & calculators.
Frequently asked questions
Multiply hours by 3600, minutes by 60 and add seconds. For example, 1:30:45 = (1 × 3600) + (30 × 60) + 45 = 3600 + 1800 + 45 = 5,445 seconds.
Select 'HH:MM:SS from total seconds' and enter the total in the seconds field. For example, 5445 seconds = 01:30:45.
Video timelines often show durations in HH:MM:SS but effects and transitions use frame counts or total seconds. Converting between formats helps with precise timing and synchronization.
Enter hours, minutes and seconds of the finish time. A 3:45:30 marathon converts to 13,530 total seconds or 225.5 total minutes. This is useful for pace calculations.
Decimal hours use fractions: 1.5 hours = 1h 30m. HH:MM uses the 60-minute clock. Payroll systems prefer decimal (1.75 hours), while clocks display HH:MM (1:45).