Time Calculator
Add and subtract hours, minutes, and seconds.
Two durations
Result
4 h 35 min
Total minutes
275
Decimal hours
4.58
Base-60 arithmetic
Time adds in base 60: 2 h 45 m + 1 h 50 m carries the 95 minutes into 4 h 35 m. Converting everything to minutes first (as this calculator does) avoids carry mistakes entirely, then converts back at the end.
Decimal hours for billing
Timesheets usually want decimal hours: minutes ÷ 60, so 4 h 35 m = 4.58 h. Common shortcuts: 15 min = 0.25, 20 min = 0.33, 45 min = 0.75. The decimal figure shown here is ready for an invoice.
Frequently asked questions
- How does the Time Calculator work?
- Add and subtract hours, minutes, and seconds.
- Is the Time Calculator free to use?
- Yes. The Time Calculator is completely free, runs entirely in your browser, and requires no account or sign-up. Your inputs never leave your device.
Related calculators
EverydayEverydayEverydayEveryday
Age Calculator
Calculate exact age in years, months, and days between two dates.
Date Calculator
Add or subtract days from a date, or count days between dates.
Hours Calculator
Count hours between two times — great for timesheets.
GPA Calculator
Calculate your GPA from course grades and credit hours.