Three time sums in one place: how long between two times, adding durations together, and what time it will be after a given stretch.
Start time → End time
Unpaid time to subtract — leave empty for none.
Total
Decimal hours—
For payroll and hourly billing — 2:45 is 2.75, not 2.45.
Add this much
Total
Decimal hours—
Time
Time
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Why an ordinary calculator gets time wrong
Type 2.45 + 3.30 into any calculator and it answers 5.75. If those were 2 hours 45 and 3 hours 30, the right answer is 6:15. The calculator is not broken — it counts in tens, and clocks count in sixties. Sixty minutes make an hour, so 45 + 30 is 75, which is one hour and fifteen, not seventy-five hundredths.
That is the whole reason this page exists, and it is also why the results below show decimal hours next to the h:mm figure. Payroll wants 2.75; a timesheet says 2:45. They are the same duration written two ways that look alike and differ by eighteen minutes.
The three calculators here answer different questions. Between two times is the one for shifts and timesheets, and it handles the night shift that runs past midnight. Adding durations is the base-60 sum itself. And the last one moves a clock forward or back, wrapping around midnight into the next day.
Frequently asked questions
How do I add hours and minutes correctly?
Add the minutes first, then carry every 60 into an hour. 2:45 + 3:30 gives 75 minutes, which is one hour and 15, so the total is 6:15. Doing it as decimals gives 5.75, which is not a time at all — it is 5 hours and 45 minutes, an entirely different number.
What is 2:45 in decimal hours?
2.75. Divide the minutes by 60: 45 ÷ 60 = 0.75. The trap is writing it as 2.45, which is 2 hours 27 minutes. Any timesheet that mixes the two conventions loses or gains time on every line.
Is my data sent anywhere?
No. Everything is worked out in your browser. There is no server to send it to — this site is static files.
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