Work Hours Calculator

Calculate your daily work hours from start time, end time, and breaks. Free, fast, and no signup required.

Enter Your Work Times

Net hours = elapsed shift time − entered break. End before start crosses midnight; equal times mean zero. Breaks, the 8-hour threshold and 1.5× multiplier are editable examples. Gross estimates use your entered rate and settings, before taxes and deductions; they do not determine entitlement.

Your Results

7.50 hrs
Total Work Hours
Start Time9:00 AM
End Time5:00 PM
Total Duration8h 0m
Break30 min
Net Work Hours7h 30m
Regular Pay$150.00
Overtime Pay$0.00
Total Pay$150.00
Interactive shift anatomy

Gross time becomes net time

9:00 AMBreak5:00 PM

8.0h gross− 0.5h break= 7.5h net

What is a work hours calculator?

A work hours calculator is a free online tool that computes your shift’s net work hours — the duration after subtracting entered breaks from your gross shift length. Often called a clock in clock out calculator, shift hours calculator, or time card calculator, it replaces manual math with instant, accurate results for any schedule.

Enter your start time, end time, and break deduction to see total hours in decimal format (e.g., 7 h 30 min = 7.50). The calculator also estimates gross amounts when you enter a rate and optional threshold. For weekly totals, use the timesheet calculator; for exact time differences, check the time duration calculator.

🔒 Your data stays private. All calculations are performed entirely in your browser — we never collect, store, or transmit any of your information.

Live formula

Watch hours flow through the calculation

Gross8.5h−Break0.5h=Net hours8.0h

How to Calculate Work Hours

The universal formula behind every calculator on this site

Net Work Hours = End Time − Start Time − Unpaid Breaks

  1. Record your clock-in time (e.g., 9:00 AM)
  2. Record your clock-out time (e.g., 5:30 PM)
  3. Subtract start from end: 5:30 PM − 9:00 AM = 8.5 gross hours
  4. Subtract unpaid breaks: 8.5 − 0.5 (30-min lunch) = 8.0 net work hours

This four-step process applies whether you use a time card calculator, a digital timesheet app, or this free online tool. The same formula works for overnight shifts — if your end time is earlier than your start time, the calculator adds 24 hours automatically.

Weekly & Monthly Totals

Add each day's net hours together for a weekly total. Our timesheet calculator does this automatically across 5–7 days. For monthly estimates, multiply weekly hours by the number of working weeks (typically 4.33).

Common Work-Hour Calculations

Real examples showing how the calculator works

☀️

Regular Work Day

Start Time9:00 AM
End Time5:00 PM
Break30 min
8h 0m gross − 30 min break = 7.5 hours worked
☕

Break Deduction

Start Time8:00 AM
End Time4:30 PM
Break60 min
8h 30m gross − 60 min break = 7.5 hours worked
🌙

Overnight Shift

Start Time10:00 PM
End Time6:00 AM
Break30 min
8h 0m gross − 30 min break = 7.5 hours worked
🔢

Decimal Hours

Start Time8:30 AM
End Time5:15 PM
Break0 min
8h 45m = 8.75 decimal 15 min = 0.25 45 min = 0.75

Frequently Asked Questions

Quick answers to common questions

How do I calculate my work hours?
Subtract your start time from your end time, then subtract any unpaid break time — that gives you your net work hours. For example, clocking in at 9:00 AM and out at 5:00 PM with a 30‑minute unpaid lunch gives 8.0 − 0.5 = 7.5 net hours. Use our Work Hours Calculator to do this instantly, including overnight shifts and multiple break periods.
How many hours did I work this week?
Add up each day’s net work hours after breaks to get your weekly total. Our Timesheet Calculator lets you enter daily start and end times for up to 7 days and produces the weekly total automatically.
How is extra-hour pay estimated?
The estimate equals hours above your selected threshold multiplied by your rate and chosen multiplier. The calculator lets you edit the threshold, multiplier, and rate used for the estimate.
How do I convert minutes to decimal hours?
Divide the minutes by 60 and add to the whole hours. For example, 7 hours 45 minutes = 7 + (45 / 60) = 7.75 decimal hours. Common conversions: 15 min = 0.25, 30 min = 0.50, 45 min = 0.75. Use our Decimal Hours Calculator for instant conversion.
How do lunch breaks affect my work hours?
Breaks you enter are subtracted from the total shift. If you work 9 AM to 5 PM and enter a 1‑hour break, the result is 7 net hours.
Can I calculate an overnight shift?
Yes. If your end time is earlier than your start time, the calculator assumes the shift crosses midnight and calculates accordingly — a 10 PM to 6 AM shift is correctly computed as 8 hours.
What is the difference between gross and net work hours?
Gross hours = total time from clock-in to clock-out, including all breaks. Net hours = gross hours minus the break minutes you enter. For example, clocking in at 8 AM and out at 5 PM gives 9 gross hours; subtract a 1-hour break and you have 8 net hours.
How many hours is 9 to 5?
A 9 AM to 5 PM shift is 8 gross hours. After subtracting a 30-minute break, you have 7.5 net work hours (or 7.5 decimal hours). After a 1-hour break, net hours drop to 7.0.
Are these calculators free to use?
Yes! All our calculators are 100% free, require no signup, and work entirely in your browser. Your data stays on your device — we never collect or store any information.
Do these calculators work on mobile?
Absolutely. All calculators are fully responsive and work on phones, tablets, and desktops with any modern browser. The interface adapts to your screen size for easy input on touchscreens.