Work Hours Calculator

About this Work Hours Calculator

The Work Hours Calculator measures a shift from start time to end time and subtracts an optional unpaid break. It also handles a shift that passes midnight, making it useful for simple timesheet checks.

Calculating actual paid work duration requires subtracting unpaid break time from the raw clock-in to clock-out span, a step that is easy to forget when quickly estimating hours worked, but that materially affects payroll totals.

For related tasks, try Pomodoro Timer, Time Duration Calculator or Hours & Minutes to Decimal.

How the calculation works

The raw duration is calculated in minutes. If the end time is earlier, the tool assumes the shift ends the next day. Break minutes are then subtracted from the duration.

How to use it

1. Enter shift start and end times.
2. Enter unpaid break minutes, if any.
3. Calculate to see paid hours and total paid minutes.

Practical example

A 09:00 to 17:30 shift with a 30-minute break produces 8 paid hours.

A shift from 9:00 AM to 5:30 PM with a 30-minute unpaid lunch break spans 8.5 hours in total clock time, but only 8 paid hours once the unpaid break is subtracted, a distinction that matters directly for hourly pay calculations.

Things to double-check

Whether a break is paid or unpaid depends on your employer's specific policy and, in many places, on local labor law; a short paid break typically should not be subtracted from paid hours, while a longer unpaid meal break typically should be.

Calculating paid hours

Paid hours equal the time between clock-in and clock-out minus unpaid breaks. A day from 9:00 to 17:30 with a 45 minute unpaid break is 7 hours 45 minutes, or 7.75 hours. Five such days make 38 hours 45 minutes, or 38.75 hours. Enter break time as minutes. Decide in advance whether a break is paid, as rules and contracts vary.

Overtime

Overtime rules differ by country and contract. If overtime applies after 40 hours a week at one and a half times the rate, someone working 44 hours at 20 an hour earns 40 times 20 plus 4 times 30, which is 920. Some places count overtime by day as well as by week. Use the weekly total from the calculator and apply the rule in your own agreement.

Keeping accurate records

Record start and finish times each day rather than reconstructing them later. Include travel time that counts as work, such as moving between sites, and note whether lunch was taken. If you work across midnight, the calculator handles the day change. Keep records for as long as your local rules require, as they protect you if there is a dispute about pay.

Rounding and breaks

Employers often round times to the nearest 5, 10 or 15 minutes. Over a month, even small rounding differences can add up to an hour or more. In many places a minimum rest break is required after a certain number of hours, and the rules about whether it is paid vary. If your calculated hours do not match your payslip, ask payroll to explain the rounding and break policy.

Weekly totals and pay

To estimate weekly pay, multiply the total hours by the hourly rate. A week of 38.75 hours at 20 an hour pays 775. If the hours vary from day to day, calculate each shift, add them and then multiply once. For part-time work, such as 20 hours a week, the yearly equivalent is 1,040 hours. Keep a record of unpaid breaks and overtime separately so that you can match it with the payslip, and raise any difference with payroll early.

Worked example: a varied week

Suppose you work Monday 9:00 to 17:30 with a 45 minute unpaid break, Tuesday 8:30 to 17:00 with 30 minutes, Wednesday 9:00 to 15:00 with 30 minutes, Thursday 9:00 to 18:00 with 60 minutes and Friday 9:00 to 16:30 with 30 minutes. The paid hours are 7.75, 8.0, 5.5, 8.0 and 7.0, a total of 36.25 hours. At an hourly rate of 18.50, the week pays 670.63. Calculating each day separately and adding is the best method when shifts and breaks vary, and it gives you a figure to compare with the payslip.

Overtime and averaging rules

Overtime rules vary. Some places pay a premium after a certain number of hours a day or a week, others average hours over several weeks, and some set maximum weekly hours and minimum daily rest. Night work and weekends may carry extra pay. Your contract and local law decide the rule, so read them carefully. The calculator gives the paid hours before premiums. Use it to see whether you have crossed a threshold, then apply the rate that your agreement gives for the extra hours.

Part-time, shift and flexible work

Part-time and shift workers often have hours that change from week to week. A roster may use a pattern of earlier and later shifts, and annualised hours contracts spread a fixed number of hours across the year. For these arrangements, calculate the hours for each period and keep a running total. Compare it with the contracted hours, and remember that statutory entitlements such as paid leave may depend on the average hours worked. If you are on flexible hours, record the days and times that you actually work.

Keeping records and resolving differences

Keep your own timesheet with the start time, end time and breaks for each day, and save a copy of each payslip. If the hours on the payslip do not match yours, show your record to the person in charge of payroll and ask for a correction. Check how rounding is applied and whether unpaid breaks are deducted at the right time. Written records are the strongest support if there is a dispute, and many employers are required to keep time records by law, so ask to see theirs.

Key terms explained

Paid hours are the hours that count toward pay, excluding unpaid breaks. A shift is a scheduled period of work. A break is a rest period and may be paid or unpaid. Overtime is time beyond the normal hours. A roster is the schedule of shifts. Part-time work means fewer hours than the standard week. Annualised hours spread a fixed total across the year. A timesheet is the record of hours worked, and payroll uses it to calculate pay.

Rules of thumb and quick checks

Paid time equals the finish time minus the start time minus unpaid breaks. A 40 hour week is eight hours a day for five days. Time worked per week multiplied by the hourly rate gives gross weekly pay. For overtime at time and a half, multiply the extra hours by 1.5 times the rate. Keep your own record of start, finish and break times each day, and compare it with the payslip.

Quick reference and sanity checks

To check a result, work through one day by hand. Subtract the start time from the end time and then subtract unpaid breaks. For example, 9:00 to 17:30 is 8.5 hours, and a 30 minute unpaid lunch leaves 8 hours. A shift that crosses midnight needs one day added to the end time, so check that the tool treats 22:00 to 06:00 as 8 hours. Paid breaks, overtime rules, rounding policies and minimum shift lengths differ between employers and countries, and they are not part of a simple calculator. For payroll or a dispute, rely on the employment contract and the official time records.

Frequently asked questions