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Date & Time

Decimal Hours Calculator

Convert clock times (7:45) to payroll decimals (7.75) and back, with a reference table of the minute values that trip people up most often.

Two-way conversion updates live: 0.25 h = 15 min · 0.5 h = 30 min · 0.75 h = 45 min. Everything else divides minutes by 60.

Minutes to Decimal Hours

MinutesDecimalMinutesDecimal
50.08350.58
100.17400.67
150.25450.75
200.33500.83
250.42550.92
300.50601.00

How the Dates Are Calculated

  1. Enter a time in h:mm format to get its decimal equivalent, or paste a decimal to get h:mm back.
  2. The conversion is exact: minutes divided by 60, shown to as many places as needed.
  3. A reference table covers the standard minute values used across timesheet systems.
  4. The two-way field updates in real time as you type — no calculate button to press.
Formula & Technical Standard
Decimal = h + m/60. Reverse: h = floor(dec), m = round(60 × (dec − h)). 15 min = 0.25 h, 30 min = 0.5 h, 45 min = 0.75 h.

Worked Example

The classic payroll entry
Input: 7:45
Output: 7.75 hours
45 minutes is three-quarters of an hour. Entering "7.45" instead of 7.75 is one of the most common payroll errors.
Reverse conversion
Input: 6.4 decimal hours
Output: 6 h 24 min
0.4 × 60 = 24 minutes. Decimal 6.4 means six hours twenty-four minutes, not six hours forty.

Common Questions

Why do payroll systems use decimal hours?

Multiplying wages by h:mm strings is error-prone; decimals make 7:45 × $16 = 7.75 × 16 = $124 a single multiplication. Almost all time-and-billing systems store minutes as decimal fractions.

Is 0.3 hours 30 minutes?

No — 0.3 hours is 18 minutes (0.3 × 60). Thirty minutes is 0.5. The reference table exists precisely because this intuition fails constantly.

How should I round my timesheet?

Follow your employer policy. Common conventions round to the nearest quarter hour (7/7.25/7.5/7.75), nearest tenth, or exact minute. Rounding rules are a compliance matter, not a math one.

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