Time to Decimal Calculator — Convert Hours & Minutes to Decimal
Convert hours and minutes to decimal hours for payroll, timesheets, and billing — or convert decimal hours back to HH:MM format. Enter a time like 1:30 to get 1.5, or enter 2.75 to get 2:45. Results update instantly.
Time to Decimal Hours
Enter hours and minutes to convert to decimal hours for payroll, timesheets, or billing.
Quick Reference Table
| Time (HH:MM) | Decimal Hours |
|---|---|
| 0:15 | 0.25 |
| 0:30 | 0.50 |
| 0:45 | 0.75 |
| 1:00 | 1.00 |
| 1:15 | 1.25 |
| 1:30 | 1.50 |
| 2:00 | 2.00 |
| 2:30 | 2.50 |
| 4:00 | 4.00 |
| 7:30 | 7.50 |
| 8:00 | 8.00 |
| 10:00 | 10.00 |
Frequently Asked Questions
How do I convert hours and minutes to decimal hours?
To convert hours and minutes to decimal hours, divide the minutes by 60 and add the result to the whole hours. For example, 2 hours 30 minutes = 2 + (30 ÷ 60) = 2.5 decimal hours. Our calculator does this instantly — just enter the hours and minutes above.
How do I convert 1 hour 45 minutes to decimal?
1 hour 45 minutes equals 1.75 decimal hours. The calculation is: 45 ÷ 60 = 0.75, then 1 + 0.75 = 1.75. In payroll terms, if your hourly rate is $20, you would earn 1.75 × $20 = $35 for that period.
What is 8 hours 30 minutes in decimal?
8 hours 30 minutes equals 8.5 decimal hours. The conversion is: 30 ÷ 60 = 0.5, so 8 + 0.5 = 8.5. A full workday of 8:30 at $15/hr would pay 8.5 × $15 = $127.50.
How do I convert decimal hours back to hours and minutes?
To convert decimal hours to hours and minutes: the whole number is the hours, and the decimal fraction multiplied by 60 gives the minutes. For example, 3.75 hours → 3 hours + (0.75 × 60) = 3 hours 45 minutes. Use the 'Decimal → Time' mode in our calculator above.
Why do payroll systems use decimal hours?
Payroll systems use decimal hours because standard arithmetic works correctly with them. You cannot multiply 8:30 (hours:minutes) by $20 directly — you must first convert to 8.5 decimal hours. Decimal time allows straightforward multiplication: 8.5 × $20 = $170. Spreadsheets like Excel also require decimal hours for time-based calculations.
What is 0.25 hours in minutes?
0.25 hours equals 15 minutes. Since 1 hour = 60 minutes, 0.25 × 60 = 15 minutes. Similarly, 0.5 hours = 30 minutes, 0.75 hours = 45 minutes, and 1.0 hours = 60 minutes.
How do I convert time in Excel to decimal hours?
In Excel, time values are stored as fractions of a day (1.0 = 24 hours). To convert an Excel time to decimal hours, multiply it by 24. For example, if cell A1 contains 1:30 PM, the formula =A1*24 returns 13.5. Alternatively, use =HOUR(A1)+(MINUTE(A1)/60) to extract hours and minutes explicitly.
What is the formula to convert minutes to decimal hours?
The formula to convert minutes to decimal hours is: Decimal Hours = Total Minutes ÷ 60. For example, 90 minutes ÷ 60 = 1.5 hours. To go the other direction: Total Minutes = Decimal Hours × 60, so 2.25 hours × 60 = 135 minutes.
Time to Decimal Conversion Guide
Conversion Formula
Converting between HH:MM time and decimal hours is straightforward once you know the underlying formula.
Time to Decimal Hours
Divide the total minutes by 60 to get the decimal representation:
Example: 1 hour 45 minutes = 1 + (45 ÷ 60) = 1 + 0.75 = 1.75 decimal hours
Decimal Hours to Time
Separate the whole number (hours) from the decimal fraction, then multiply the fraction by 60:
Minutes = round((Decimal Hours − Hours) × 60)
Example: 2.25 decimal hours → Hours = 2, Minutes = round(0.25 × 60) = 2:15
Why This Matters
Clocks count time in base-60 (60 minutes per hour), but calculators, spreadsheets, and payroll systems work in base-10. Multiplying 1:30 × $20/hour incorrectly gives $1,030; the correct decimal conversion gives 1.5 × $20 = $30.
Common Conversions Table
Use this reference table for the most frequently encountered minute-to-decimal conversions:
| Minutes | Decimal (fraction of hour) | Fraction |
|---|---|---|
| 5 min | 0.0833 | 1/12 |
| 6 min | 0.1000 | 1/10 |
| 10 min | 0.1667 | 1/6 |
| 12 min | 0.2000 | 1/5 |
| 15 min | 0.2500 | 1/4 |
| 20 min | 0.3333 | 1/3 |
| 30 min | 0.5000 | 1/2 |
| 36 min | 0.6000 | 3/5 |
| 45 min | 0.7500 | 3/4 |
| 48 min | 0.8000 | 4/5 |
| 54 min | 0.9000 | 9/10 |
Note: 15 and 30 minutes are the most common values in payroll systems because they are exact quarters of an hour.
Payroll & Timesheet Use Case
Decimal hours are the standard format used by payroll software, billing systems, and project management tools because they allow straightforward multiplication with an hourly rate.
Step-by-Step Payroll Example
- An employee works from 9:00 AM to 5:45 PM — a total of 8 hours 45 minutes.
- Convert 8:45 to decimal: 8 + (45 ÷ 60) = 8.75 decimal hours.
- Multiply by hourly rate: 8.75 × $25/hr = $218.75 gross pay.
Common Timesheet Scenarios
| Clock Time | Decimal Hours | Pay @ $20/hr |
|---|---|---|
| 7:30 | 7.50 | $150.00 |
| 7:45 | 7.75 | $155.00 |
| 8:00 | 8.00 | $160.00 |
| 8:15 | 8.25 | $165.00 |
| 8:30 | 8.50 | $170.00 |
| 8:45 | 8.75 | $175.00 |
Rounding Rules in Payroll
Many US employers use the FLSA 7-minute rule: time worked up to 7 minutes is rounded down to the nearest quarter-hour; 8 minutes or more is rounded up. For example, 1 hour 7 minutes rounds to 1.00 hours, while 1 hour 8 minutes rounds to 1.25 hours (1:15). Always verify your employer's specific rounding policy.