Work hours calculators
Calculate work hours, time cards, overtime, and pay instantly. Pick a calculator and get an answer without creating an account.
Choose a calculator
Every tool is free, works without signup, and calculates locally in your browser.
Work time
Clock entries, shifts, breaks, and weekly totals.
- Time Card Calculator
Total a weekly time card with breaks, overtime, and estimated pay.
- Work Hours Calculator
Calculate one shift's worked time after unpaid breaks.
- Clock Out Calculator
Find your clock-out time from a start time, duration, and break.
- Time Clock Calculator
Total multiple clock-in and clock-out periods for a workday.
Time conversion
Add durations and convert time formats.
- Decimal Hours Calculator
Convert between hours and minutes and payroll-style decimals.
- Hours Calculator
Add or subtract multiple hour-and-minute durations.
- Time Calculator
Add or subtract a duration from a clock time.
Pay estimates
Gross earnings, overtime, and salary equivalents.
- Overtime Calculator
Estimate regular pay, overtime pay, and total gross earnings.
- Hourly Pay Calculator
Estimate gross earnings from hourly and overtime work.
- Salary to Hourly Calculator
Convert annual salary to an hourly pay equivalent.
Built for instant answers
WorkHoursLab runs calculations in your browser. There is no signup and no server round-trip for core hour math — open a calculator, enter values, and get a result immediately.
A practical place to start
Use the Work Hours Calculator for one shift, the Time Card Calculator for a week, or the Hourly Pay Calculator when you already know the hours worked.
Work-time guides
Understand the formulas, assumptions, and common mistakes behind the calculators.
- How to Calculate Work Hours
A step-by-step work-hours formula with examples.
- How to Calculate Overtime Pay
Overtime formulas, a worked example, and key caveats.
- How Lunch Break Deductions Affect Work Hours
How to subtract lunch accurately without mixing time formats.
- Time Card Calculation Guide
A day-by-day method for accurate weekly time cards.
- How to Calculate Clock-Out Time
A clock-out formula with same-day and overnight examples.