Timesheet Hours Calculator

A timesheet hours calculator totals a working week from daily start and end times, subtracts the daily break, and converts the total into decimal hours and pay. A five-day week of 9:00 AM to 5:00 PM with a 30-minute break each day totals 37 hours 30 minutes, which is 37.50 decimal hours, and at $25 an hour that is $937.50 of pay. The time calculator above is the timesheet calculator on this site, with a row for each weekday, a break field, and an hourly rate, and this page explains the weekly total step by step.

A timesheet is a record, not just a calculation: it shows each day’s hours, the break taken, and the running total, so the week can be checked day by day. The daily pattern here is the standard one: 9:00 AM to 5:00 PM is 8 hours, less a 30-minute break is 7 hours 30 minutes, and five such days is 37 hours 30 minutes. This page works through the week day by day, shows the pay at two rates, and explains the checks that catch the common timesheet errors.

How Time Arithmetic Works: Adding, Subtracting, and Pay

Time arithmetic is base-60 arithmetic, which is why it feels unfamiliar: 60 minutes make an hour, so 2 hours 45 minutes plus 1 hour 30 minutes is 4 hours 15 minutes, not 3 hours 75 minutes, because the 75 minutes carry one hour. The reliable method is to convert everything to minutes, add or subtract, and convert back: 165 + 90 = 255 minutes, and 255 ÷ 60 = 4 hours with 15 minutes left over. The calculator above does this conversion for you, and it also converts the result to decimal hours, so 7 hours 30 minutes is 7.50 hours for pay and billing.

The time between two clock times is a subtraction with the same carry rule. From 9:00 AM to 5:00 PM is 8 hours, and with a 30-minute break the working time is 7 hours 30 minutes. Overnight spans need one extra step: from 10:00 PM to 6:00 AM is 8 hours, because the clock passes midnight, so the end time belongs to the next day. A five-day week of 9:00 AM to 5:00 PM with a 30-minute break each day totals 37 hours 30 minutes, which is 37.50 decimal hours, and at $25 an hour that is $937.50 of pay.

The United States time standards behind these calculations are maintained by the National Institute of Standards and Technology, whose time and frequency work is published at nist.gov. The arithmetic on this page is the same base-60 arithmetic that clocks, timesheets, and payroll systems all use.

Step 1 — Convert Every Duration to Minutes

Multiply the hours by 60 and add the minutes: 2 hours 45 minutes is 165 minutes, and 1 hour 30 minutes is 90 minutes. Working in minutes removes the base-60 confusion entirely, and it is the step the calculator performs internally.

Step 2 — Add or Subtract the Minutes

Add the minute totals: 165 + 90 = 255 minutes. For a time between two clock times, subtract the start minutes from the end minutes, adding 1,440 minutes (24 hours) to the end first if the span crosses midnight.

Step 3 — Convert Back to Hours and Minutes

Divide by 60: 255 ÷ 60 = 4 hours with 15 minutes left over, so the answer is 4 hours 15 minutes. For pay, divide the total minutes by 60 to get decimal hours: 450 minutes is 7.50 hours, and 7.50 × $25 = $937.50.

Worked Example: A Full Timesheet Week

Each row is one day of the standard week, with the break subtracted and the paid hours shown, and the total at the bottom.

The total is the figure to check: five days of 7 hours 30 minutes is 5 × 450 = 2,250 minutes, which is 37 hours 30 minutes, or 37.50 decimal hours. At $25 an hour the week’s pay is 37.50 × $25 = $937.50, and at $30 an hour it is 37.50 × $30 = $1,125.00. The on-site time is 40 hours, the break time is 2 hours 30 minutes, and the paid time is the difference, which is the check that the timesheet adds up. Try the same week in the calculator above and confirm the total and the pay.

How to Use the Time Calculator

The calculator has modes for adding and subtracting durations, for the time between two clock times, and for a full weekly timesheet with daily breaks and an hourly rate. Enter your times and it shows hours, minutes, decimal hours, and pay.

1. Choose the mode. Add durations for totals, between two times for a single span, or timesheet for a full week with a break each day.
2. Enter the hours and minutes. The default durations add to a clean example; change any field and the total updates immediately.
3. Set the break for timesheet mode. The default 30-minute daily break is subtracted from each day before the weekly total is computed.
4. Enter an hourly rate to see pay. The calculator multiplies decimal hours by your rate, so 37.50 hours at $25 an hour shows $937.50.
5. Read the decimal hours. Payroll and billing use decimal hours, so 7 hours 30 minutes is 7.50 hours, not 7.30, and the calculator shows both forms.

Weekly Totals and Pay at Two Rates

This table shows what the standard week pays at two common rates, and what a longer week pays at the same rates.

Common Mistakes With Time Arithmetic

Time is the only everyday arithmetic that runs in base 60, and that is exactly where the mistakes come from.

• Writing 7.30 for 7 hours 30 minutes. In decimal hours, 30 minutes is 0.50, not 0.30, so 7 hours 30 minutes is 7.50 hours. The .30 error underpays by 12 minutes an hour.
• Forgetting to carry 60 minutes. 2 hours 45 minutes plus 1 hour 30 minutes is 4 hours 15 minutes, not 3 hours 75 minutes, because 75 minutes carries an hour.
• Forgetting midnight. A shift from 10:00 PM to 6:00 AM is 8 hours, not negative 16, because the end time belongs to the next day.
• Subtracting the break twice. A 30-minute break is subtracted once per day; subtracting it from the total as well as from each day double-counts it.
• Mixing 12-hour and 24-hour times. 5:00 PM is 17:00, and subtracting 9:00 from 5:00 without the PM gives a wrong or negative answer.

Where You Will Use Time Arithmetic

Adding hours, measuring spans, and totalling timesheets are the arithmetic of work, travel, and everyday planning.

• Timesheets and payroll. A week of 9:00 AM to 5:00 PM with a 30-minute break is 37 hours 30 minutes, and the pay follows from the decimal hours.
• Shift planning. The gap between a shift’s start and end, minus breaks, is the paid time, and it must be right before the roster is published.
• Travel. The time between departure and arrival, across time zones and overnight, is the journey length, and it decides connections and rest.
• Project tracking. Adding task durations in hours and minutes shows the total effort, and converting to decimal hours prices it.
• Daily routines. Adding a workout, a commute, and a lunch break shows how much of the day is spoken for, and how much is left.

Checking a Timesheet Before Submitting It

A timesheet should be checked the way a bank statement is checked: day by day, then in total. First, confirm each day’s start and end times, and that AM and PM are right, because a 9:00 AM start typed as 9:00 PM changes the day by 12 hours. Second, confirm the break was subtracted once per day, not twice and not never. Third, add the daily paid hours and confirm they equal the weekly total: five days of 7 hours 30 minutes must total 37 hours 30 minutes. Fourth, convert to decimal hours and multiply by the rate, and confirm the pay matches the expected amount for the week.

Tips for Accurate Results

Time arithmetic rewards a steady method. These habits keep the minutes honest.

1. Always work in minutes. Convert to minutes, do the arithmetic, and convert back; it removes the base-60 confusion at a stroke.
2. Write AM and PM explicitly. A 12-hour time without AM or PM is ambiguous, and the ambiguity always costs an hour or twelve.
3. Record the break once per day. In a timesheet, the break belongs to the day it was taken, not to the weekly total.
4. Use decimal hours for money. Multiply decimal hours by the rate, never hours-and-minutes notation, or the pay will be wrong.
5. Check overnight spans by adding. From 10:00 PM, add the hours forward past midnight to 6:00 AM and count: 2 hours to midnight plus 6 hours is 8.

Time Quick Answers

These are the time answers people look up most often, each one verified against the calculator above.

Related tools on this site: the main time calculator, salary calculator, days calculator, date difference calculator, and the time calculator again whenever you need a fresh check.

Frequently Asked Questions

How many hours are in a 9 to 5 week with a 30-minute break?

Each day is 7 hours 30 minutes, because 9:00 AM to 5:00 PM is 8 hours less a 30-minute break. Five days total 37 hours 30 minutes, which is 37.50 decimal hours, and at $25 an hour that is $937.50 of pay.

How do I calculate timesheet hours?

For each day, subtract the start time from the end time, subtract the break, and add the daily totals. Five days of 9:00 AM to 5:00 PM with a 30-minute break is 5 × 7 hours 30 minutes = 37 hours 30 minutes. The calculator above does the week in one step.

What is 37 hours 30 minutes in decimal hours?

It is 37.50 decimal hours, because 30 minutes is half an hour. Multiply the decimal hours by the hourly rate for the pay: 37.50 × $25 = $937.50.

How do I calculate pay from a timesheet?

Convert the weekly total to decimal hours and multiply by the hourly rate. For 37.50 hours at $25 an hour, the pay is $937.50, and at $30 an hour it is $1,125.00. Overtime rules may add more for hours over 40.

Should the break be paid time?

Usually not: a meal break of 30 minutes or more is generally unpaid, while a short rest break of 20 minutes or less is generally paid. The exact rule depends on your employer and the applicable labour law, so check the policy that governs your role.

Disclaimer: This calculator is for general information only. Pay figures are estimates from the hours and rate you enter; actual pay is governed by your employer, your contract, and applicable labour law, including overtime rules.