Time Card Calculator
Total up hours worked across a week from clock-in and clock-out times, with break deductions and overtime pay.
How to use this calculator
- 1List each day worked: a label, clock-in time, clock-out time, and break minutes, one per line.
- 2Set your hourly rate and overtime rules to see total pay.
How the calculation works
Hours per day = (Clock out − Clock in) − Break. Overtime = max(0, Total hours − Threshold)- Threshold
- The weekly hours after which overtime pay applies — commonly 40 in the US
- Overtime multiplier
- The pay rate multiplier for overtime hours — commonly 1.5× ("time and a half")
A shift where clock-out is earlier in the day than clock-in is treated as crossing midnight (an overnight shift) rather than an error, adding a full day to the calculation.
Worked example
A standard 5-day week with 30-minute lunch breaks
- 1.Mon: 9:00 AM–5:00 PM = 8h, − 30 min break = 7.5h. Tue: 8.5h − 0.5h = 8h.
- 2.Wed and Thu: 7.5h each. Fri: 7h − 0.5h = 6.5h.
- 3.Total: 7.5 + 8 + 7.5 + 7.5 + 6.5 = 37 hours — under the 40-hour threshold, so no overtime.
- 4.Pay: 37 × $20 = $740.00.
Result: 37 hours, $740.00
What a time card actually tracks
A time card — or timesheet — is a record of when someone started and stopped working, used to calculate pay and, in many workplaces, to satisfy legal record-keeping requirements. At its simplest it is a log of clock-in and clock-out times for each shift, with unpaid breaks subtracted to arrive at hours actually worked.
The format has stayed conceptually the same for well over a century even as the technology behind it changed completely, because the underlying question — how many hours did this person actually work — hasn’t changed.
From punch clocks to software
Mechanical time clocks, where a worker inserted a paper card to stamp the exact time, were a fixture of factories and offices through much of the twentieth century, and gave rise to the phrase “punching in.” They were popular because a machine-stamped time was harder to dispute or alter than a handwritten log.
Modern time tracking has mostly moved to software — badge systems, mobile apps and biometric scanners — but the goal is identical: an accurate, tamper-resistant record of hours worked that both employee and employer can rely on for pay and for resolving disputes.
What belongs on a timesheet
A useful time card captures more than just a start and end time.
- Clock-in and clock-out times — the raw start and end of each shift, ideally to the minute rather than rounded on the way in.
- Unpaid breaks — meal breaks and other unpaid time are subtracted from the shift, since only time actually worked is paid.
- Daily and weekly totals — hours are usually summed both per day and per week, since overtime rules in many places depend on one or both figures.
- Overnight and split shifts — shifts that cross midnight need to be handled explicitly so the hours don’t come out negative or wrong.
Why accurate tracking matters for both sides
For employees, an accurate time card is the basis for correct pay, including any overtime owed — errors tend to compound quietly if a rounding habit or a missed break deduction repeats every week. For employers, accurate records are often a legal requirement, not just good practice: many jurisdictions require employers to keep time and pay records for non-exempt employees, with penalties possible for records that are missing or unreliable.
Disputes over hours worked are also far easier to resolve with a contemporaneous written record than with memory alone, which is part of why both sides generally benefit from keeping careful timesheets even in informal workplaces.
Good habits for keeping time
A few consistent habits keep a timesheet accurate without turning it into a chore.
- 1Log times as they happen — rather than reconstructing a week from memory at the end of it — memory is a poor substitute for a contemporaneous record.
- 2Record breaks explicitly — even short ones, if they’re unpaid — an unrecorded break either overpays the worker or underpays them, depending on which way the assumption defaults.
- 3Note anything unusual — a split shift, an overnight shift, a late clock-out — right away, while the reason is still clear.
- 4Reconcile before submitting — check the week’s total against the schedule before submitting it, catching obvious errors before they reach payroll rather than after.
What this assumes, and where it stops
Assumptions
- Every shift is entered in chronological order for that day, and breaks are unpaid.
Limitations
- Does not model daily overtime rules (some jurisdictions pay overtime after 8 hours in a single day, not just 40 in a week) or shift differentials for nights, weekends or holidays.
Common questions
Does this handle overnight shifts?
Yes — if the clock-out time is earlier in the day than the clock-in time (for example, in at 10:00 PM and out at 6:00 AM), it is treated as a shift that crosses midnight rather than a negative duration, and a full 24 hours is added before subtracting to get the correct worked time.
Is overtime always calculated after 40 hours a week?
Under US federal law (the Fair Labor Standards Act) for non-exempt employees, yes — but some states and countries use different rules, including daily overtime thresholds. Adjust the threshold and multiplier fields to match your actual situation.
Sources
- Overtime pay — US Department of Labor
Formula and content last reviewed on .
Results are estimates for information only, not professional advice.
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