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Work Hours Calculator

Net work hours from start time, end time and break duration.

Best for: Logging a shift, checking hours before submitting a timesheet, or invoicing hourly work.

Complete guide

Input

How it's calculated & sources
The Work Hours Calculator uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Work hours = (end − start) − break. Times in HH:MM.

Example

09:00 to 17:30 with 30 min break = 8.0 hours.

Frequently asked questions

Cross midnight?+

If end is earlier than start, the calculator assumes the shift crosses midnight.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Work Hours?
A work hours calculator totals the hours between a start and end time, minus breaks, for a shift or a day.
Why does Work Hours matter?
Net paid hours for the period, ready to multiply by an hourly rate or roll into a timesheet.
How is Work Hours calculated?
It subtracts the start time from the end time and removes any unpaid break to give net hours. Convert minutes to decimal hours when needed — 30 minutes is 0.5 hours, not 0.30 — and handle shifts that run past midnight by carrying into the next day.
What are common work hours mistakes?
Reading minutes as decimals (45 minutes is 0.75 hours, not 0.45).
When should you use the Work Hours Calculator?
Logging a shift, checking hours before submitting a timesheet, or invoicing hourly work.

What is the Work Hours Calculator?

A work hours calculator totals the hours between a start and end time, minus breaks, for a shift or a day.

How the Work Hours Calculator works

It subtracts the start time from the end time and removes any unpaid break to give net hours. Convert minutes to decimal hours when needed — 30 minutes is 0.5 hours, not 0.30 — and handle shifts that run past midnight by carrying into the next day.

Common mistakes to avoid

  • Reading minutes as decimals (45 minutes is 0.75 hours, not 0.45).
  • Forgetting to deduct unpaid breaks.
  • Mishandling overnight shifts that cross midnight.

Keywords: work, hours, shift.

Sources: US Dept. of Labor — Hours worked

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Work Hours Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Work Hours Calculator?+

Work Hours Calculator uses the standard work hours formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Work Hours Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Work Hours Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Title: I built/used this free work hours calculator — instant, no signup

Body: Net work hours from start time, end time and break duration. Try it: https://freetoolsgalaxy.com/tools/work-hours-calculator
LinkedIn post
Work Hours Calculator on Free Tools Galaxy — Net work hours from start time, end time and break duration. https://freetoolsgalaxy.com/tools/work-hours-calculator
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# Work Hours Calculator — the free tool I keep coming back to

Net work hours from start time, end time and break duration.

Try it: https://freetoolsgalaxy.com/tools/work-hours-calculator
Quora answer
The fastest way is to use a free in-browser work hours calculator: https://freetoolsgalaxy.com/tools/work-hours-calculator. Net work hours from start time, end time and break duration.

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<iframe src="https://freetoolsgalaxy.com/tools/work-hours-calculator?embed=1" title="Work Hours Calculator" loading="lazy"
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[Work Hours Calculator — free online tool](https://freetoolsgalaxy.com/tools/work-hours-calculator)

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I kept needing a quick fraction calculator and most options online were slow or behind paywalls, so I built one that:

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