Hours to Decimal Calculator

Convert a clock time of hours, minutes, and seconds into decimal hours using Decimal Hours = H + M/60 + S/3600 — the standard formula behind payroll and timesheet conversions.

Quick Facts

Formula
Decimal Hours = H + M÷60 + S÷3600
15 min = 0.25 hr, 30 min = 0.5 hr, 45 min = 0.75 hr, 6 min = 0.1 hr.

Your Results

Calculated
Decimal hours (exact)
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H + M/60 + S/3600
Decimal hours (2 dp)
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Standard payroll precision
Rounded to increment
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Using your selected rounding step
Total minutes
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Decimal hours × 60

Ready

Enter a time and press Calculate to convert it to decimal hours.

About the Hours to Decimal Calculator

This tool converts a clock-format duration — hours, minutes, and seconds — into a single decimal number of hours, the format most payroll, invoicing, and spreadsheet systems expect. It applies the standard conversion formula directly, with no estimation involved.

The formula

Decimal hours are calculated as:

  • Decimal Hours = H + (M ÷ 60) + (S ÷ 3600), where H is whole hours, M is minutes (0–59), and S is seconds (0–59).
  • Each minute contributes 1/60 of an hour (about 0.016667), and each second contributes 1/3600 of an hour.
  • Example: 7 hours, 30 minutes, 0 seconds → 7 + 30/60 + 0/3600 = 7 + 0.5 = 7.5 decimal hours.

Payroll rounding

Because exact decimal hours can run to many digits (for example, 7h 22m = 7.366667), many timesheet and payroll systems round to a fixed increment before totaling pay. The most common increments are the nearest 0.25 hour (quarter hour) and the nearest 0.1 hour (six-minute) step; some systems use hundredths for near-exact tracking. This calculator shows the unrounded exact value alongside a value rounded to whichever increment you select, using standard round-half-up rounding.

Quick reference: minutes to decimal hours

  • 6 minutes = 0.10 hr
  • 15 minutes = 0.25 hr
  • 30 minutes = 0.50 hr
  • 45 minutes = 0.75 hr
  • 36 minutes = 0.60 hr

Frequently Asked Questions

What is the formula to convert hours and minutes to decimal hours?
Decimal hours = Hours + Minutes/60 + Seconds/3600. For example, 7 hours 30 minutes = 7 + 30/60 = 7.5 decimal hours. Each minute equals 1/60 (about 0.0167) of an hour, and each second equals 1/3600 of an hour.
Why do payroll systems round decimal hours?
Many timesheet and payroll systems round worked time to a fixed increment, commonly the nearest quarter hour (0.25) or tenth of an hour (0.1), to simplify pay calculations. This calculator rounds using standard round-half-up rounding to whatever increment you select, in addition to showing the exact unrounded value.
How do I convert minutes alone to a decimal hour value?
Divide the minutes by 60. So 15 minutes = 0.25 hours, 30 minutes = 0.5 hours, 45 minutes = 0.75 hours, and 6 minutes = 0.1 hours. This is the same Minutes/60 term used inside the full H + M/60 + S/3600 formula.

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