Hours, minutes, and (optionally) seconds — payroll-ready decimals.
Turn a decimal like 8.75 back into clock time.
What a duration is worth — decimal conversion included.
Timesheets are written on a 60-minute clock, but payroll systems multiply in hundredths — and mixing the two up is the most common timesheet mistake there is. This calculator converts time to decimal hours (and back) with seconds-level precision, multiplies a duration by an hourly rate, and includes the full minute-by-minute chart payroll clerks keep taped to their monitors. Everything runs in your browser, using the exact formulas below.
Each unit divides by its size in an hour:
Decimal = h + m÷60 + s÷3600 8:30 = 8 + 0.50 = 8.50 7:45 = 7 + 0.75 = 7.75
Going back, multiply the fraction by 60 for minutes.
The four quarter-hours cover most timesheets:
:15 = 0.25 :30 = 0.50 :45 = 0.75 :06 = 0.10 :20 = 0.33 :40 = 0.67
Everything else is in the chart above, to two decimal places.
Decimal hours exist so pay is one multiplication:
Pay = Decimal hours × Rate 8:30 × $20 = 8.50 × 20 = $170.00
Multiplying 8.30 by the rate instead would short the check by $4 an hour of error.
Divide the minutes by 60 and add them to the hours: 8:30 is 8 + 30÷60 = 8.50 decimal hours. If you're tracking seconds too, they divide by 3,600. The top card does all of it live, and shows the total in minutes and seconds as well.
7:45 is 7.75 decimal hours — 45 minutes is 45÷60 = 0.75 of an hour. The quarter-hours are worth memorizing: :15 = 0.25, :30 = 0.50, :45 = 0.75. For every other minute, use the color-coded chart above.
Because clocks count 60 minutes to the hour while decimals count in hundredths. The ":30" means 30 sixtieths — which is 50 hundredths, so 8.50. Writing 8.3 would actually mean 8 hours 18 minutes (0.3 × 60). This is exactly the mistake that shorts paychecks, and the reason this calculator exists.
Most use two decimal places, which is precise to 36 seconds — that's what this page and the chart show. Some employers round to the nearest quarter hour (0.25) instead, so 7:52 might be paid as 7.87 or as 8.00 depending on policy. If a check doesn't match your math, rounding policy is the first thing to ask about.
Everywhere: the time card calculator converts your whole week to decimal hours for pay, the work hours calculator converts single shifts, and the hours & minutes calculator shows decimal totals for any duration math. This page is the deep-dive with seconds precision, the pay-rate card, and the full chart.
Results are estimates for general guidance only and are not professional advice. Please double-check anything that affects pay, safety, or spending — see our full disclaimer.