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.
Conversion Formula
Converting between HH
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:
Decimal Hours = Hours + (Minutes ÷ 60)
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:
Hours = floor(Decimal Hours)
Minutes = round((Decimal Hours − Hours) × 60)
Example: 2.25 decimal hours → Hours = 2, Minutes = round(0.25 × 60) = 2
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
× $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 AM to 5 PM — a total of 8 hours 45 minutes.
- Convert 8 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 | 7.50 | $150.00 |
| 7 | 7.75 | $155.00 |
| 8 | 8.00 | $160.00 |
| 8 | 8.25 | $165.00 |
| 8 | 8.50 | $170.00 |
| 8 | 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
). Always verify your employer's specific rounding policy.
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