How hours worked are calculated
For each day, subtract the clock-in time from the clock-out time and remove the break. From 8:30 to 17:15 with a 45-minute break: 17:15 − 8:30 = 8 h 45 min, minus 45 minutes = 8 hours. If you finish after midnight (a night shift such as 22:00 to 6:00) the calculator understands that you clocked out the next day and counts 8 hours; the row is marked with 🌙.
The weekly total is shown in hours and minutes (for example 38 h 30 min) and in decimal hours (38.50): multiply the decimal hours by your hourly rate, 38.5 × 10 = 385. If you enter your contract hours per week (often 40, or 36–38 in many contracts) you also see the hours above them; whether and how they are paid as overtime depends on your contract.
Hours and minutes to decimal hours
Payroll, invoices and spreadsheets often use decimal hours: 7 hours 45 minutes is not 7.45 but 7.75, because 45 minutes are three quarters of an hour. To convert, divide the minutes by 60 (45 ÷ 60 = 0.75); to go back, multiply the decimal part by 60 (0.3 × 60 = 18 minutes, so 7.3 hours = 7 h 18 min).
| Minutes | Decimal hours |
|---|---|
| 5 | 0.08 |
| 10 | 0.17 |
| 15 | 0.25 |
| 20 | 0.33 |
| 25 | 0.42 |
| 30 | 0.5 |
| 35 | 0.58 |
| 40 | 0.67 |
| 45 | 0.75 |
| 50 | 0.83 |
| 55 | 0.92 |
| 60 | 1 |
Adding and subtracting hours and minutes
When you add times, minutes carry over every 60, not every 100: 2 h 40 min + 1 h 30 min = 4 h 10 min (not 3.70). The "Add hours" tab does the carrying for you, handles subtractions (choose "−" in a row) and, when the total goes over 24 hours, also shows it in days: handy for monthly hours, project time or flight hours.
Frequently asked questions
What is 7 hours 30 minutes in decimal?
7.5. Divide the minutes by 60: 30 ÷ 60 = 0.5. Likewise 15 minutes are 0.25 and 45 minutes 0.75.
How do I calculate a night shift?
Enter clock-in and clock-out as they are: if clock-out is earlier than clock-in (for example 22:00 and 6:00) the calculator counts across midnight.
Can I work out my weekly pay?
Yes: enter your hourly rate and it is multiplied by the decimal hours. It is a gross estimate: taxes, contributions and premiums depend on your contract.
Does the calculator save my times?
No: the data stays on the page and disappears when you close it. You can copy the summary with the button.