Hours Calculator

Duration between times, overnight shifts, breaks

Quick Answer

Hours Calculator: Duration between times, overnight shifts, breaks. Hours Calculator uses standard date & time formulas to compute accurate results instantly.

Start time

End time

Break (min)

Hourly rate (optional)

Net duration

8h 30m

= 8.50h decimal

Gross span9h 30m

Break deducted60min

Decimal hours8.50

vs 8h standard+0h 30m

Span breakdown

Net work510min (35.4%)Break60min (4.2%)Rest of day870min (60.4%)

Steps

109:00 → 18:30 = 9h 30m gross
2Minus break 60min → net 8h 30m
3As decimal: 510min ÷ 60 = 8.50h (timesheets use this)
40h 30m beyond the 8h standard — overtime territory

💡 Decimal hours trip up payroll constantly: 1h30m = 1.5h, but 1h45m = 1.75h (not 1.45!). Night shifts crossing midnight need +24h on the end time. Under China labor law, standard work is 8h/day & 44h/week; weekday OT pays 150%, rest days 200%, public holidays 300%.

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How to Use

Pick dates or a mode: select start/end dates or switch modes in the Hours Calculator.
Instant calculation: results appear immediately with day/week/month equivalents.
Solve both ways: change any field and everything updates — forward or reverse.
Check the context: read the solar-term/holiday/rule notes on this page.

Key Points

Hours Calculator is a free online date & time tool — open and use, no sign-up.
All calculations run locally in your browser; your data never leaves the device.
Key capability: Duration between times, overnight shifts, breaks.
Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Hours Calculator formula

Hours Calculator uses standard date & time formulas to compute accurate results instantly.

FAQ

How do I use the Hours Calculator?

Open the page and fill in the input fields — results update automatically. Duration between times, overnight shifts, breaks.

Are the results accurate?

Yes. Standard formulas and conversion factors are used and verified.

Is it free? Do I need to sign up?

Completely free. No registration, login or download required.

Does it work on mobile?

Yes. The responsive design works on phones, tablets and desktops.

Is my data saved?

No. Everything runs locally in your browser.

Related Guides

Source & Updates

Based on standard calendar arithmetic. Last updated: 2025-07

Authoritative sources:

Purple Mountain Observatory, CAS

Last updated: 2026-08-04

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Cite this page: YiJianSuan. Hours Calculator[EB/OL]. https://www.yijiansuan.com/en/c/date/hours-calc

Results provided by this tool are for reference only and do not constitute professional advice.