Time Calculators

Choose the tool that matches the values you already have and the result you need.

Durations and work hours

Add and subtract durations or move a known clock time forward or backward.

Find the elapsed time between two clock readings, including an interval that crosses midnight.

Convert hours, minutes, and seconds to decimal hours, or convert a decimal value back to a duration.

Total a week of start and end times after subtracting unpaid breaks.

Count the days between two calendar dates, with the option to include both dates.

Find the calendar date a set number of days before or after a starting date.

Estimate how long it takes to speak a given number of words at your own pace.

For formulas and supported input ranges, see the methodology.