Time Calculations. Made Simple.

Enter a number and select the hour, min, or sec key to assign its unit. For example, enter 2, select hour, then enter 30 and select min to create a duration of 2 hours and 30 minutes. Choose an operator such as + or − to continue your calculation. The calculator automatically converts the values and updates the result.

Decimal values are interpreted according to the selected time unit and automatically converted into hours, minutes, and seconds. For example, 1.5 hours equals 1 hour and 30 minutes, while 1.5 minutes equals 1 minute and 30 seconds. Results are also displayed in decimal hours, making it easier to use them in timesheets. For example, 1 hour and 15 minutes equals 1.25 hours.

Yes. You can multiply or divide a time duration by a number. For example, multiplying 1 hour and 15 minutes by 4 gives 5 hours, while dividing 8 hours by 3 gives 2 hours and 40 minutes.

Percentage operations scale a time duration proportionally. For example, adding 10% to 2 hours and 10 minutes adds a 13-minute buffer, resulting in 2 hours and 23 minutes. This can be useful for calculating schedule allowances, overhead, or additional time.

Yes. You can use parentheses to group parts of an expression and control the order of operations according to BODMAS. For example, (45m + 15m) × 5 adds the durations inside the parentheses first, then multiplies the result by 5 to give 5 hours.

Every calculation provides three formats: a standard duration (1h 20m 30s), a digital time format (01:20:30), and decimal hours (1.3417 h). These formats make it easy to read durations, work with digital time values, and use results in decimal-based calculations or timesheets.