Employee Overtime Percentage Calculator: Overtime as a Share of Hours
Work out overtime as a percentage of hours worked — a workforce-planning metric that signals understaffing, demand spikes, and burnout risk, and that drives labor cost because overtime pays a 1.5x premium.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Overtime percentage | Regular hours share |
|---|---|---|
| 8 OT of 40 hours (20%) | 20.00% | 80.00% |
| 4 OT of 44 hours (9%) | 9.09% | 90.91% |
| 20 OT of 60 hours (33% high) | 33.33% | 66.67% |
| 2 OT of 42 hours (5%) | 4.76% | 95.24% |
How This Calculator Works
Enter overtime hours and total hours worked during the period. The calculator divides one by the other and multiplies by 100 to give the overtime percentage, with the regular-hours share shown alongside. A consistent overtime percentage above 15% to 20% usually signals a staffing problem rather than a temporary spike.
The Formula
Part as a Percentage of a Whole
Part is the portion, Whole is the total it belongs to
Worked Example
8 overtime hours against 40 total hours is a 20% overtime rate, with 80% regular hours. Because overtime pays 1.5x in the US (FLSA), that 20% of hours costs 30% of straight-time wages — meaning overtime is often cheaper to solve by hiring than by paying premium indefinitely. Sustained overtime above 20% is a strong indicator that adding headcount would lower total labor cost.
Key Insight
Overtime percentage is the cleanest signal of whether to hire. Temporary overtime (demand spikes, seasonal peaks) is cheaper than hiring because you avoid benefits and onboarding cost. But sustained overtime above 15% to 20% usually means a permanent role is needed — the 1.5x premium plus burnout-driven turnover and quality decline typically exceed the all-in cost of an additional hire. Many operations managers run chronic overtime because the OT cost is hidden in variable labor while a new hire is a visible fixed commitment.
Frequently Asked Questions
How is overtime percentage calculated?
Divide overtime hours by total hours worked, multiply by 100. 8 OT hours out of 48 total is a 16.7% overtime rate; 8 OT against a 40-hour base is 20%. Be consistent about whether the denominator includes OT.
How is overtime paid in the US?
Under the FLSA, non-exempt employees earn 1.5x their regular rate for hours over 40 per week. Some states (California) require daily overtime over 8 hours/day and double-time over 12 hours/day. Exempt (salaried) employees generally don't earn overtime.
When does overtime cost more than hiring?
Sustained overtime above roughly 15% to 20% usually exceeds the all-in cost of an additional hire once the 1.5x premium, burnout-driven turnover, and quality decline are counted. Temporary spikes are cheaper to handle with overtime than with hiring and later layoffs.
What's a healthy overtime percentage?
Under 5% is comfortable; 5% to 10% is normal for operations with demand variability; 10% to 20% signals stretched staffing; above 20% sustained is a strong hire signal and a burnout risk. Manufacturing, healthcare, and logistics commonly run higher than office work.
How does overtime affect labor cost percentage?
It inflates it disproportionately. 20% of hours at 1.5x pay equals 30% of straight-time wages for that portion. A workforce running 20% overtime has a labor cost roughly 10% higher than the same hours at straight time — money that often justifies hiring.
Related Calculators
Methodology & Review
Overtime percentage is overtime hours divided by total hours worked, multiplied by 100. The complement is the regular-hours share. High overtime percentages signal understaffing, demand spikes, or burnout risk — and inflate labor cost because overtime hours are paid at 1.5x (or 2x) regular rate.
Written by Ugo Candido · Last updated May 17, 2026.