How to Calculate Overtime Percentage: Hours, Payroll Share and Premium

Choose What the Percentage Measures

For the share of worked hours that are overtime, use overtime hours ÷ total worked hours × 100. A worker with 40 regular hours and ten overtime hours has an overtime-hours percentage of 10 ÷ 50 × 100 = 20%.

That is not the same as overtime's share of wages, or the percentage increase from an ordinary hourly rate. Define the measure before comparing workers, weeks or departments. This guide is about reporting ratios; our overtime rate guide explains the wage calculation itself.

Overtime Hours Divided by Total Hours

Let OT mean qualifying overtime hours and T mean all actual worked hours in the same reporting period:

Overtime-hours percentage = OT ÷ T × 100.

• 40 regular plus five overtime hours: 5 ÷ 45 × 100 = 11.11%.
• 40 regular plus ten overtime hours: 10 ÷ 50 × 100 = 20%.
• 40 regular plus twenty overtime hours: 20 ÷ 60 × 100 = 33.33%.

Use the same period for both numbers. An ordinary weekly overtime calculation should identify qualifying hours separately for each workweek before combining them for a monthly report. Averaging weekly hours first can erase overtime that was actually worked.

When no hours were worked, report the ratio as not applicable rather than dividing by zero. When worked hours are positive but overtime is zero, the percentage is 0%.

Why Dividing by Regular Hours Gives a Different Answer

Some reports compare overtime with regular hours instead of all hours. For 40 regular hours and ten overtime hours, that ratio is 10 ÷ 40 × 100 = 25%.

Both calculations can be mathematically correct, but they answer different questions:

• 20% of total worked hours were overtime.
• Overtime hours were 25% as large as regular hours.

Label the denominator explicitly. A report saying only “overtime is 25%” is ambiguous and can make two otherwise identical schedules look different.

Overtime's Share of Gross Wages

Suppose the regular rate is $20, the worker has no additional compensation changing that rate, and the week contains 40 regular plus ten overtime hours:

• Regular wages: 40 × $20 = $800.
• Full overtime wages: 10 × $30 = $300.
• Gross wages: $1,100.
• Overtime-wages share: $300 ÷ $1,100 × 100 = 27.27%.

The hours share was 20%, but the wages share is higher because overtime hours cost more per hour. Bonuses, shift differentials, mixed rates and other wage components can change the payroll ratio; use the actual relevant payroll totals rather than assuming every overtime hour has the same cost.

A 50% Premium Does Not Mean 50% of Payroll

Time and a half is 150% of the regular rate: a 50% increase over straight time. At $20, the overtime rate is $30 and the extra premium is $10 per overtime hour.

For the ten overtime hours above, the additional premium is $100. Its share of the $1,100 gross wages is 9.09%, not 50% or 27.27%. The $300 full overtime wages already include $200 of straight time plus that $100 premium; do not add the $100 twice.

Read our overtime premium explanation when interpreting a pay stub that lists the premium separately.

Calculate a Team's Ratio from Totals

Employee A works 50 hours including ten overtime hours. Employee B works 20 hours with no overtime. Together, overtime is 10 ÷ 70 × 100 = 14.29% of worked hours.

Simply averaging their individual percentages, 20% and 0%, gives 10%—not the team's ratio. Sum overtime hours and total worked hours first. Our average overtime hours guide explains a different measure: hours per employee.

Frequently Asked Questions

Is there a legally required “healthy” overtime percentage?

There is no universal target in the federal overtime rule. A reporting ratio does not establish compliance, safe staffing or a right to require extra work.

Should paid vacation go in the worked-hours denominator?

Not when reporting overtime as a share of actual worked hours. If a separate report includes paid leave, label it as paid hours and do not compare it directly with a worked-hours ratio.

Which figure should I use to track scheduling?

Overtime hours divided by total worked hours is a useful clearly labeled measure. For budgeting, also distinguish full overtime wages from the additional premium.

Use the overtime cost calculator for wage estimates and retain the underlying timesheets for the ratios. This article explains arithmetic, not a legal determination of which hours qualify.