Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Total hours
8.00
Pay
$200.00
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter shift 1 — start (hours, decimal).
- 2Enter shift 1 — end.
- 3Enter shift 2 — start.
- 4Enter shift 2 — end.
- 5Enter hourly rate ($).
- 6Read your total hours on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Add up to four shifts in 24-hour format and get total hours worked plus pay if you set an hourly rate.
Worked example
Using the values the calculator loads with:
Inputs
- Shift 1 — start (hours, decimal): 9
- Shift 1 — end: 17
- Shift 2 — start: 0
- Shift 2 — end: 0
- Hourly rate: 25 $
Results
- Total hours: 8
- Pay: $200.00
What each field means
Inputs
- Shift 1 — start (hours, decimal)
- The shift 1 — start (hours, decimal) used in the calculation. Starts at 9 so you have a working example on load. Accepted range: 0–24.
- Shift 1 — end
- The shift 1 — end used in the calculation. Starts at 17 so you have a working example on load. Accepted range: 0–24.
- Shift 2 — start
- The shift 2 — start used in the calculation. Starts at 0 so you have a working example on load. Accepted range: 0–24.
- Shift 2 — end
- The shift 2 — end used in the calculation. Starts at 0 so you have a working example on load. Accepted range: 0–24.
- Hourly rate ($)
- The hourly rate used in the calculation, measured in $. Starts at 25 $ so you have a working example on load.
Results
- Total hours
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Pay
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the hours calculator work?
Add up to four shifts in 24-hour format and get total hours worked plus pay if you set an hourly rate.
What do I need to enter?
5 values: shift 1 — start (hours, decimal), shift 1 — end, shift 2 — start, shift 2 — end, and hourly rate. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the total hours result mean?
It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary.
Who is this tool for?
It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Hours Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/hours
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/hours" target="_blank" rel="noopener">Hours Calculator — RevenueLab</a> (2026).</p>
Source: [Hours Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/hours) (2026).