Timesheet & work hours calculators
Add up a week of hours, convert minutes to decimals, or split regular and overtime — these free calculators handle the time math payroll runs on. Pick the one that matches your task. No sign-up, and they all show decimal hours so you can multiply straight by a pay rate.
Add up a full week from clock in/out, breaks, and overtime.
HoursDuration between a start and end time, minus breaks.
HoursConvert hours and minutes to decimal hours, both ways.
HoursAdd up several hours-and-minutes entries to a total.
HoursSplit a week into regular vs overtime hours.
HoursTime and pay lost to unpaid lunches each week.
HoursWorking days between two dates.
How timesheet math works
Every timesheet comes down to three steps. First, find each day's hours: end time minus start time, minus any unpaid break. Second, add the days for a weekly total. Third, convert to decimal hours so payroll can multiply by a rate — divide the minutes by 60, so 8:30 becomes 8.50.
Overtime sits on top of that. Under federal law (FLSA), anything over 40 hours in a week is paid at 1.5× your regular rate. A few states — California, Colorado, Alaska and others — also pay daily overtime once you pass 8 or 12 hours in a single day. The overtime pay calculator and the state overtime rules cover those cases.
Which calculator should I use?
- Time Card Calculator — a full week of clock in/out times, breaks, and overtime in one total.
- Hours Calculator — a single span of time, like 9:15 AM to 5:45 PM minus a 30-minute lunch.
- Decimal Hours Calculator — turn hours and minutes into a payroll-ready decimal, or back again.
- Overtime Hours Calculator — split a week into regular and overtime hours.
- Unpaid Break Calculator — see what unpaid lunches cost you over a week and a year.
Frequently asked questions
Subtract the start time from the end time for each day, take off any unpaid break, then add the days together. A 9:00 AM–5:00 PM day with a 30-minute lunch is 7.5 hours. The time card calculator does the whole week for you.
Divide the minutes by 60. So 15 minutes is 0.25, 30 is 0.50, and 45 is 0.75. Payroll uses decimals because you can multiply them straight by a pay rate — 7.5 hours × $20 = $150.
In the U.S., full-time is usually 40 hours a week, or about 2,080 hours a year. Overtime under federal law (FLSA) starts after 40 hours in a week, paid at 1.5× your regular rate.
Use the time card calculator for a full week, the hours calculator for a single span of time, the decimal hours calculator to turn time into a payroll-ready number, and the overtime hours calculator to split regular from overtime.