date-time calculator
Time Card Calculator
Calculate elapsed, regular, overtime, and decimal work hours from explicit time and break inputs.
Calculate time card hours
Result
Enter values and calculate.
How to use this calculator
- Enter start and end as minutes after midnight.
- Enter any unpaid break in minutes.
- Enter a mathematical overtime threshold in hours.
- Calculate and review regular, overtime, and total hours.
Symbols and units
| Symbol | Meaning | Unit or domain |
|---|---|---|
start/end | Elapsed clock positions | Minutes after midnight |
break | Unpaid time removed | Minutes |
threshold | Point separating regular and overtime | Hours |
worked | End minus start minus break | Minutes |
Checked examples
Standard shift
Inputs: Start 540; end 1020; break 30; threshold 8
Calculation: 1020−540−30=450 minutes
Result: 7.5 hours
All time is below the eight-hour threshold.
Check: work-media.test.ts — time-card known answer
Overtime threshold
Inputs: Start 480; end 1080; break 30; threshold 8
Calculation: 570−480=90 overtime minutes
Result: 9.5 hours; 1.5 overtime
This is arithmetic only, not a pay-rule determination.
Check: work-media.test.ts — overtime split
Assumptions, rounding, and limits
- End must follow start; overnight shifts can use end minutes above 1440.
- Breaks are subtracted exactly.
- No automatic rounding is applied.
- Overtime rules, pay periods, meal rules, premiums, and labor law are excluded.
Frequently asked questions
Is this payroll advice?
No. It performs disclosed arithmetic only.
Can it handle overnight work?
Yes, enter an end value above 1440 for the next day.
Does it round punches?
No. Enter already-authorized values if an employer uses a rounding policy.
Sources and review
- BIPM: International System of Units (SI Brochure) — Units of time and the second
- Formula version
- time.card@1.0.0
- Formula review
- Equatara formula review
- Editorial review
- Equatara editorial review
- Last verified
- 2026-10-25
- Applicability
- Global time arithmetic; no payroll or legal rule.
- Next review
- On material change, or by 2028-10-25.
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Found a problem?
Report a formula, result, example, source, or accessibility issue through the calculator correction process. Do not include sensitive input values.