How do I add hours and minutes together?

Enter each time value in HH:MM:SS format in the rows, then click "Calculate Total". The tool sums all entries and presents the result in hours, minutes, and seconds.

Can I add more than two time values?

Yes — click "Add Row" to insert as many time entries as you need. The tool supports unlimited rows.

How do I calculate elapsed time?

Use the "Subtract Time" tab. Enter the start time and the amount of time to subtract, then click "Subtract" to find the remaining time.

How do I convert minutes to hours?

Divide minutes by 60. For example, 135 minutes = 135 ÷ 60 = 2 hours 15 minutes = 2.25 decimal hours. The time calculator handles this automatically when you sum time entries.

Can I calculate payroll hours with this tool?

Yes — enter clock-in and clock-out times for each day, add them together, and the total shows exact hours worked. For pay calculations, use the decimal hours output (e.g., 38.5 hours × hourly rate).

Time Calculator — Add, Subtract & Convert Hours, Minutes, Seconds

What Is a Time Calculator?

A time calculator adds, subtracts, and totals time values expressed in hours, minutes, and seconds. Unlike standard calculators, it correctly handles time's non-decimal nature — there are 60 seconds per minute and 60 minutes per hour, not 100. This makes time arithmetic prone to errors when done manually.

Common Uses for a Time Calculator

Payroll: Total employee work hours across a week, including breaks and overtime.
Project tracking: Sum time logged across multiple tasks for accurate billing and reporting.
Sports timing: Add lap times or segment durations to get total race or training session time.
Media production: Total clip durations to match a target run time.
Travel planning: Add up flight segments, layovers, and transfer times.
Cooking: Time multiple dishes with different durations to coordinate meal readiness.

Time Addition Formula

Convert all times to seconds, add the totals, then convert back:

Convert each entry: Hours × 3600 + Minutes × 60 + Seconds
Sum all converted values
Convert result back: ÷ 3600 for hours, remainder ÷ 60 for minutes, remainder for seconds

Example: 1:45:30 + 2:20:45 = (6330 + 8445) seconds = 14775 seconds = 4 hours, 6 minutes, 15 seconds.