Decimal Hours Converter

Flip any time between h:mm and decimal instantly — 8:30 becomes 8.50, 6.4 becomes 6:24. Includes the full minutes-to-decimal chart payroll teams keep taped to the monitor.

Convert both ways

Edit either field — the other converts instantly.

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8:30 = 8.50 decimal hours = 510 minutes

The formula

Minutes → decimal: divide by 60. Decimal → minutes: multiply the fraction by 60. So 8:45 is 8 + 45÷60 = 8.75 hours, and 6.4 hours is 6 hours + 0.4 × 60 = 6:24.

Payroll tip: the most common timesheet error is writing 8 hours 30 minutes as "8.30". In decimal, 8.30 means 8 hours 18 minutes — a 12-minute underpayment every day it happens.

Full minutes-to-decimal conversion chart

MinDecMinDecMinDec
10.02210.35410.68
30.05240.40440.73
60.10270.45450.75
90.15300.50480.80
120.20330.55510.85
150.25360.60540.90
180.30390.65570.95
200.33400.67601.00

Converting a whole week of punches? The time card calculator shows every daily and weekly total in both formats automatically.

Frequently asked questions

What is 8 hours 30 minutes in decimal?

8.50 hours. Divide the minutes by 60: 30 ÷ 60 = 0.50. Writing it as 8.30 is the classic payroll error — that means 8 hours 18 minutes.

What is 45 minutes in decimal hours?

0.75 hours. The quarter-hour anchors are 15 min = 0.25, 30 min = 0.50, 45 min = 0.75.

Why does payroll use decimal hours?

Pay is rate × hours, and multiplication needs a decimal number. 7:45 at $16/hour is 7.75 × 16 = $124.00.

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