Quick Conversion Reference
| Minutes | Decimal Hours |
|---|---|
| 15 min | 0.25 |
| 20 min | 0.333 |
| 30 min | 0.50 |
| 45 min | 0.75 |
| 50 min | 0.833 |
Hours to Decimal Calculator
Convert hours and minutes to decimal hours for timesheets, payroll, and billing. Also convert decimal hours back to hours and minutes. Essential for tracking work hours accurately.
Time to Decimal Converter
Frequently Asked Questions
How do you convert minutes to decimal hours?
Divide the minutes by 60 to get the decimal fraction. For example: 30 minutes ÷ 60 = 0.5, so 7 hours 30 minutes = 7.5 decimal hours. For 45 minutes: 45 ÷ 60 = 0.75, so 3 hours 45 minutes = 3.75 decimal hours. This is the format used by most payroll systems and billing software.
Why use decimal hours for timesheets?
Decimal hours make arithmetic simple — you can add, subtract, and multiply directly. For example, multiplying 7.5 hours by your $20/hour rate gives $150. Working with hours:minutes would require converting first. Most modern payroll software stores time in decimal format. Billing at 6-minute (0.1 hour) increments is common in legal and consulting.
Why conversion is needed
Payroll systems multiply hours by a rate, and that requires decimal hours. Clock time is base 60, so 7 hours 30 minutes must be entered as 7.5, not 7.30.
Decimal hours = hours + (minutes ÷ 60)
Conversion table
| Min | Dec | Min | Dec |
|---|---|---|---|
| 5 | 0.083 | 35 | 0.583 |
| 10 | 0.167 | 40 | 0.667 |
| 15 | 0.25 | 45 | 0.75 |
| 20 | 0.333 | 50 | 0.833 |
| 25 | 0.417 | 55 | 0.917 |
| 30 | 0.5 | 60 | 1.0 |
The cost of getting it wrong
Entering 7.30 instead of 7.50 understates the shift by 12 minutes. Repeated across five shifts a week for a year, that is roughly 52 hours of unpaid time per employee — the kind of error that becomes a significant back-pay liability across a workforce.
Rounding
Several minute values produce recurring decimals. 20 minutes is 0.3333… and 10 minutes is 0.1666…, so some rounding is unavoidable.
Two decimal places is standard for payroll and keeps the error under a second per entry. Rounding to one decimal place introduces up to three minutes of error per shift, which accumulates meaningfully over a year.
Round only once, at the end, rather than at each intermediate step — repeated rounding compounds the drift.
Billing in professional services often uses tenths of an hour (6-minute increments) by convention, which is why legal and consulting time is recorded as 0.1, 0.2 and so on.