Hours and Minutes Calculator
Add or subtract hours and minutes, total up a week of timesheet entries, and convert between hours and minutes and decimal hours for payroll.
Results
| Item | Value |
|---|
Quick Answer
To add hours and minutes, add the minutes, carry every 60 minutes into an hour, then add the hours. A week of 7:45, 8:30, 6:50, 8:15 and 7:40 adds up to 39:00, which is 39.00 decimal hours. To turn minutes into decimal hours, divide by 60: 45 minutes is 0.75 hours.
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Table of Contents
- Hours and Minutes Calculator
- Quick Answer
- Related Calculators
- How This Hours and Minutes Calculator Works
- How to Use the Hours and Minutes Calculator
- Hours and Minutes Formulas
- Key Terms
- Worked Example
- Real-Life Examples
- Hours:Minutes vs Decimal Hours
- Minutes to Decimal Hours
- Timesheets and Rounding
- Everyday Uses
- Common Mistakes to Avoid
- Frequently Asked Questions
- References & Sources
How This Hours and Minutes Calculator Works
Enter up to seven times as hours and minutes. The calculator adds them up, carrying every 60 minutes into an hour, and shows the total in hours:minutes, as words, as decimal hours and as total minutes. Put a minus sign in front of a time to subtract it, such as an unpaid lunch break. Add an hourly rate to see the pay. Or switch the mode to turn decimal hours, such as 7.75, back into hours and minutes.
Quick explanation: time uses base 60, not base 10.
- 1 hour = 60 minutes, so 7:30 is 7.5 hours, not 7.3.
- 15 minutes = 0.25 hours; 30 minutes = 0.5; 45 minutes = 0.75.
- Payroll usually needs decimal hours.
How to Use the Hours and Minutes Calculator
- Choose ‘Add or subtract times’ or ‘Decimal hours to hours and minutes’.
- Enter each time as h:mm, putting a minus sign in front to subtract.
- Or enter decimal hours to convert them.
- Optionally, enter an hourly rate.
- Press Calculate to see the total in hours:minutes and decimal hours.
Hours and Minutes Formulas
- Total minutes: hours × 60 + minutes, added for every entry
- Back to hours and minutes: hours = whole part of (total minutes ÷ 60); minutes = the remainder
- Decimal hours: total minutes ÷ 60
- Decimal hours to minutes: decimal part × 60 (0.75 h = 45 min)
- Pay: decimal hours × hourly rate
Key Terms
- Decimal hours: time written as a decimal number of hours, such as 7.75.
- Hours:minutes: time written with a colon, such as 7:45.
- Carrying: turning every 60 minutes into one more hour.
- Timesheet: a record of hours worked, used for pay.
- Rounding rule: an employer’s rule for rounding time, such as to the nearest 15 minutes.
Worked Example
You need 40 hours this week and have worked 37 hours 25 minutes so far.
- Enter 40:00 and −37:25.
- 40:00 = 2,400 minutes; 37:25 = 2,245 minutes
- 2,400 − 2,245 = 155 minutes = 2:35
- You have 2 hours 35 minutes left, or 2.58 decimal hours.
Real-Life Examples
- Weekly timesheet: 7:45 + 8:30 + 6:50 + 8:15 + 7:40 = 39:00 (39.00 hours).
- Pay: at $22 an hour, 39.00 hours pays $858.00.
- Hours left: 40:00 − 37:25 = 2:35.
- Payroll conversion: 7.75 decimal hours is 7:45, and 8.2 hours is 8:12.
Hours:Minutes vs Decimal Hours
- Hours:minutes (7:45) is how clocks and timesheets show time.
- Decimal hours (7.75) is what payroll and invoices multiply by a rate.
- Common mistake: 7:45 is not 7.45 hours; it is 7.75.
Minutes to Decimal Hours
| Minutes | Decimal | Minutes | Decimal |
|---|---|---|---|
| 5 | 0.08 | 35 | 0.58 |
| 10 | 0.17 | 40 | 0.67 |
| 15 | 0.25 | 45 | 0.75 |
| 20 | 0.33 | 50 | 0.83 |
| 25 | 0.42 | 55 | 0.92 |
| 30 | 0.50 | 60 | 1.00 |
Timesheets and Rounding
Many employers record time in decimal hours, often rounded to the nearest tenth (6 minutes) or quarter hour (15 minutes). Converting each day to decimals before adding can cause small rounding errors, so it is better to add the hours and minutes first and convert the total. If you need daily totals from clock-in and clock-out times, use the Time Card or Time Duration Calculator, then total the days here.
Everyday Uses
Adding hours and minutes helps with timesheets and invoices for freelance work, totalling the running time of a playlist or video edit, planning travel with several legs, logging study or practice hours, tracking flight or driving hours, and splitting the time spent on a project between clients.
Common Mistakes to Avoid
- Reading 7:45 as 7.45 hours. It is 7.75 hours.
- Carrying at 100 instead of 60. 70 minutes is 1 hour 10 minutes.
- Rounding each day before adding. Add first, then round the total.
- Forgetting unpaid breaks. Subtract them with a minus sign.
- Mixing up a time of day with a duration. This tool adds durations; use Time Duration for clock times.
Frequently Asked Questions
Add the minutes, carry every 60 minutes into an hour, then add the hours.
Divide the minutes by 60. For example, 45 ÷ 60 = 0.75.
7.5 hours.
Multiply the decimal part by 60: 8.2 hours = 8 hours 12 minutes.
Yes, put a minus sign in front of the time to subtract.
Enter each day’s hours and minutes; the calculator adds them and gives decimal hours for payroll.
0.25 hours.
Yes. 1:75 is treated as 2 hours 15 minutes.
Convert to decimal hours and multiply by the hourly rate, or enter the rate here.
References & Sources
| Source | Used For | Link |
|---|---|---|
| NIST, Guide to the SI, Appendix B.8 | The hour (3,600 s) and minute (60 s). | https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 |