Hours calculator.

An hours calculator adds and subtracts times in hh:mm and returns the total in hours and minutes plus decimal hours. The sum 08:30 + 02:45 + 01:15 − 00:40 comes to 11:50, or 11.83 hours. To turn minutes into a decimal, divide by 60: 50 minutes is 0.83 of an hour.

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Type several times separated by + or −. Totals can pass 24 hours with no problem.

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Totalcalterix
11:50
11.83 hours in decimal (710 minutes), 4 values
  • Hours and minutes11:50
  • Decimal hours11.83
  • Total minutes710

How to add and subtract hours and minutes

Hours and minutes use base 60, not base 10. The safest method turns everything into minutes, adds or subtracts, and converts back. An hour has 60 minutes, so 150 minutes is 2 hours and 30 minutes.

08:30 + 02:45 = 510 + 165 = 675 min = 11:15
Decimal hours = minutes ÷ 60 (675 ÷ 60 = 11.25 hours)
Total minutes ÷ 60 gives the whole hours, and the remainder is the minutes.

To convert between minutes, decimals, and hh:mm, use the hours and minutes converter. To measure the gap between two dates, use the days between dates calculator.

Worked examples

MathResultDecimal
08:30 + 02:45 + 01:15 − 00:4011:5011.83
10:15 − 07:5002:252.42
07:50 − 10:15−02:25−2.42
10:30 PM to 6:15 AM (crosses midnight)07:457.75
40:00 + 08:30 (total passes 24 hours)48:3048.50
Every sum is done in minutes and converted back.

Time card and timesheet math

For a weekly time card, find the paid hours for each day, then add the days. Clocking in at 9:00 AM and out at 5:30 PM with a 30-minute unpaid lunch is 8 paid hours. Five of those days make 40:00, and a full-time year at 40 hours a week adds up to 2,080 hours.

  • Payroll systems usually want decimal hours: 7 hours 45 minutes is 7.75, not 7.45.
  • Some employers round punches to the nearest quarter hour. Ask your payroll or HR contact how your company does it.
  • Enter the break as unpaid minutes only. A paid break stays inside your hours.
Under the federal Fair Labor Standards Act, most hourly employees get overtime at 1.5 times their regular rate after 40 hours in a workweek. Some states add daily overtime rules, and some jobs are exempt. This calculator only adds up time, so check the rules that apply to you.

Common mistakes with hours

  • Treating minutes as decimals: 2h30 is 2.5 hours, not 2.30. Divide the minutes by 60.
  • Subtracting column by column: 10:15 − 07:50 is not 03:−35. Borrow 1 hour (60 minutes) and the answer is 02:25.
  • Forgetting that the clock passed midnight: 10:30 PM to 6:15 AM is 7 hours 45 minutes, not a negative number.
  • Mixing decimal hours with hh:mm: to add 1.5 hours to 00:45, turn 1.5 into 01:30 first.
Negative results show a minus sign, which helps when you track a comp time balance that is running short.

Go deeper

ConversionHours and minutes to decimalMinutes, decimal hours, and hh:mm, with a chart of 1 to 59 minutes

Frequently asked questions

How do I add hours and minutes?

Convert everything to minutes, add, and divide by 60. For 08:30 + 02:45, that is 510 + 165 = 675 minutes, or 11:15. The calculator does it for any number of times.

How do I subtract hours and minutes?

Subtract in minutes and convert back to hh:mm. 10:15 minus 07:50 is 615 − 470 = 145 minutes, or 02:25. If the second value is bigger, the result is negative.

How do I calculate hours worked on a time card?

Subtract clock in from clock out, take off the unpaid break, and add the days. From 9:00 AM to 5:30 PM with a 30-minute break is 8 hours a day, or 40 hours over 5 days.

How do I convert hours and minutes to decimal?

Divide the minutes by 60 and add the result to the hours. 11:50 is 11 + 50/60 = 11.83 hours. The hours and minutes page has a full chart.

How do I calculate the time between two times?

Use the Between two times tab. If the end time is earlier than the start time, the math assumes you crossed midnight: 10:30 PM to 6:15 AM is 7 hours 45 minutes.

Can the total go past 24 hours?

Yes. The total shows as accumulated hours, like 48:30, and is not turned into days. That works for timesheets and monthly totals.

Sources and method

Standard public-domain formulas. Every calculation is checked against independent numeric tests before it goes live.