How to Calculate Overtime Hours

Basic formula

Regular hours are the smaller of total hours and threshold hours. Overtime hours are the hours above the threshold. Once those two pieces are separated, gross pay can be estimated from the hourly rate and overtime multiplier.

The formula is a math model. It does not decide which overtime threshold, multiplier, workweek, daily rule, holiday rule, or exception applies. Enter the threshold and multiplier that match the situation you are reviewing.

• Regular Hours = Min(Total Hours, Threshold)
• Overtime Hours = Max(Total Hours - Threshold, 0)
• Overtime Pay = Overtime Hours x Hourly Rate x Multiplier

Step-by-step overtime example

Suppose a weekly timesheet totals 47.5 paid hours. The threshold entered is 40 hours. The regular portion is 40 hours, and the overtime portion is 47.5 - 40 = 7.5 hours.

If the hourly rate is $20 and the overtime multiplier is 1.5, regular pay is 40 x $20 = $800. Overtime pay is 7.5 x $20 x 1.5 = $225. The estimated gross pay is $1,025 before taxes, deductions, reimbursements, or payroll adjustments.

How to choose the threshold

Many examples use a 40 hour weekly threshold because it is common and easy to understand. That does not mean every job, jurisdiction, contract, or worker uses the same threshold. Some situations may involve daily overtime, alternative schedules, different pay periods, or no overtime calculation at all.

For a calculator estimate, use the threshold that should be tested. If you are not sure, keep the assumption visible instead of hiding it. A note such as "estimated with 40 hour weekly threshold" helps another reviewer understand the result.

What counts as total hours

The total hours used for overtime review should usually be paid work hours, not the raw clock span before unpaid breaks. If a shift is 9 hours long but includes a 30 minute unpaid lunch, the paid time is 8.5 hours. Use the paid time when building the weekly total unless the applicable policy says otherwise.

This is why overtime review often starts with a time card or timesheet calculation. First confirm the daily paid hours, then add the week, then split the total into regular and overtime hours.

Common overtime calculation mistakes

One common mistake is calculating overtime from a two-week total instead of reviewing each week separately when a weekly threshold is intended. Another is forgetting that unpaid breaks reduce paid hours before the overtime split is calculated. A third is using gross pay as if it were take-home pay.

Also watch for decimal hour errors. Seven hours and 45 minutes is 7.75 hours, not 7.45. If the total hours are wrong, the overtime split and gross pay estimate will also be wrong.

• Confirm paid hours before splitting regular and overtime.
• Use the intended threshold and multiplier.
• Keep daily, weekly, and biweekly assumptions separate.

Caution

Actual overtime rules can vary. Use this as a math tool, not payroll or legal advice. TimesheetKit does not determine whether a worker is eligible for overtime, whether a rule applies, or whether a payroll result is compliant.

For official payroll, use the employer policy, contract, payroll system, or professional guidance that applies. The calculator is best used to make the arithmetic transparent before that review.

How to document an overtime estimate

When an overtime estimate is reviewed by another person, document the assumptions beside the result. Include the total paid hours, the threshold, the hourly rate, the multiplier, and whether the total was built from exact clock times or from already-rounded entries. That context prevents the result from looking like an unexplained number.

If the estimate is for planning, label it as an estimate. If it is for payroll, compare it with the official source records and applicable policy. The same arithmetic can be used in both situations, but the review standard is higher when money is actually being paid.

How overtime connects to timesheets

Overtime should usually be reviewed after the timesheet total is confirmed. If the timesheet total includes a missed lunch, duplicate break, or wrong decimal conversion, the overtime estimate will inherit that mistake. Start with accurate paid hours, then split regular and overtime hours.

For two-week or biweekly records, check whether the overtime review is supposed to happen week by week. Combining two weeks into one large total can produce a different result than reviewing each week separately.

Related tools

FAQ