Utilities Suite
Time Calculator
Calculate the duration between two times, or add/subtract hours and minutes from a specific time.
Time Duration
Analytical Logic
Mastering Time Math
Time calculations use a base-60 system rather than the standard base-10 decimal system we use for normal math. This makes mental math with hours and minutes error-prone. This tool guarantees precision.
FAQ
Enter a start and end time. If the end time is earlier than the start time, the calculator assumes the end time is on the following day.
Yes, when adding or subtracting times, if the result crosses midnight, the calculator indicates the day offset (e.g., +1d or -1d).
The inputs depend on your browser and operating system settings, but typically display as 12-hour with AM/PM for ease of use. Calculations internally run on 24-hour time.