Break Deduction Calculator
Enter the hours you worked before breaks, the break length, and how many breaks to take off, to see the hours that remain.
Break Deduction Calculator calculates in your browser.
Take breaks off hours you already know
Sometimes you already have the hours — 8.5 on a schedule, 42.5 for the week, 8 hours 15 minutes from a time clock — and just need the breaks taken off. Enter that time as decimal hours or as hours and minutes, the length of the break, and how many breaks to subtract: one lunch from a single shift, or a lunch on each of five days from a weekly total. The calculator shows the time left in hours and minutes and in decimal hours, and catches the common mistake of subtracting 0.30 for a 30-minute break. If you’re starting from clock-in and clock-out times instead, the Shift Length Calculator With Breaks works out the shift first.
How to use the Break Deduction Calculator
- Type the time before breaks: decimal hours such as 8.5 in Hours, or whole hours plus minutes.
- Type the break length in minutes, or tap 15, 30, 45, or 60 min.
- Type how many breaks of that length to take off. Use 0 for none.
- Read the time after breaks, its decimal hours, the total deduction, and the time you started with.
The formula
Time before breaks (minutes) = hours × 60 + minutes
Break deduction = break length × number of breaks
Time after breaks = time before breaks − break deduction
Decimal hours = minutes ÷ 60
A 30-minute break is 0.5 hours, not 0.30: minutes are sixtieths of an hour. Decimal hours are rounded to 2 places and marked ≈ when they don’t come out exactly. If the decimal hours you type include part of a minute — 8.51 hours is 510.6 minutes — the hours and minutes are rounded to the nearest minute and marked ≈ too.
| Time before breaks | Breaks | Time after breaks | Decimal hours |
|---|---|---|---|
| 8.5 hours | 1 × 30 min | 8 hours | 8 hours |
| 8 hours 15 minutes | 2 × 20 min | 7 hours 35 minutes | ≈ 7.58 hours |
| 10 hours | 2 × 15 min | 9 hours 30 minutes | 9.5 hours |
| 24 hours | 4 × 30 min | 22 hours | 22 hours |
| 42.5 hours (a week) | 5 × 30 min | 40 hours | 40 hours |
Calculated on your device
- The calculation runs in your browser as you type; nothing is sent to a server.
- Your hours, breaks, and results are not sent to Looty Tools or stored.
- The calculator area is masked from session-recording analytics, so what you enter isn’t captured in recordings.
Limitations
- It doesn’t say whether a break is paid or counts as work time — that depends on your employer’s policy and the rules where you work. It subtracts only the break time you enter.
- All the breaks in one calculation are the same length. For breaks of different lengths in one shift, use the Shift Length Calculator With Breaks, or add them up first.
- Up to 10,000 hours before breaks, breaks of up to 1,440 minutes, and up to 1,000 breaks. The breaks can’t add up to more than the time entered.
- It works out time, not pay; it doesn’t apply overtime or any other payroll rule.
Related calculators
- Shift Length Calculator With BreaksFind shift length after subtracting breaks.
- Timesheet Hours to Decimal ConverterTurn timesheet hours and minutes into decimal hours.
- Time Duration CalculatorAdd or compare lengths of time.
Guides
- Subtract DurationsSubtract one length of time from another by borrowing minutes and hours, handle negative results, and take a break off a shift total.
- Subtract Lunch From HoursTake a lunch break off hours worked in hours and minutes or in decimals, with lunch lengths as decimals and the mistakes that change a total.
- Breaks on a Weekly TimesheetTake daily breaks off a weekly total in one step, handle days with no break or longer breaks, and check the result against daily entries.
- Break Deduction ChartWorking time left after 15- to 60-minute breaks on 4- to 12-hour shifts, in hours and minutes and in decimal hours.
Break Deduction Calculator FAQ
- How do I subtract a lunch break from my hours?
- Turn the break into hours by dividing the minutes by 60, then subtract. 8.5 hours minus a 30-minute lunch is 8.5 − 0.5 = 8 hours.
- Why isn’t a 30-minute break 0.30 hours?
- Minutes are sixtieths of an hour, not hundredths. 30 minutes is 0.5 hours, so taking off 0.30 instead would leave 0.2 hours — 12 minutes — too many.
- How do I take breaks off a weekly total?
- Multiply the break length by the number of breaks and subtract once. 42.5 hours with a 30-minute lunch on each of 5 days is 42.5 − 2.5 = 40 hours.
- Can I enter my hours as hours and minutes?
- Yes. Use the Hours and Minutes boxes together: 8 hours 15 minutes with two 20-minute breaks leaves 7 hours 35 minutes, about 7.58 decimal hours.
- Are breaks paid or unpaid?
- That depends on your employer’s policy and the rules where you work, and the calculator doesn’t decide it. It subtracts only the break time you enter.
- Are the hours and dates I enter sent anywhere?
- No. The calculation runs in your browser as you type. Your hours, dates, and results are not sent to Looty Tools or stored, and the calculator area is masked from session-recording analytics. Refreshing the page clears it.
