⏰ Time Calculator

Enter your time values, select 'Add', and click Calculate. The calculator handles carrying over: 90 minutes automatically becomes 1 hour 30 minutes. It works with hours, minutes, and seconds.

Enter your start time and end time in the fields, select the difference operation, and calculate. This is useful for calculating work hours, meeting durations, or time elapsed between events.

1 hour = 60 minutes = 3,600 seconds. To convert 2.5 hours: 2.5 × 60 = 150 minutes, or 2.5 × 3,600 = 9,000 seconds. The calculator handles these conversions instantly.

Time math is base-60, not base-10, which is exactly where manual addition trips people up — "1:45 + 0:30" isn't 1:75, it's 2:15, and it's easy to get that carry-over wrong when you're tired or doing it quickly. The calculator handles the carrying automatically so there's no mental arithmetic to double-check.

Yes — enter a clock-in and clock-out time to get the exact duration, which is one of the most common uses for this calculator. For adding up a full week of shifts, use the addition mode to total multiple entries together.