How Overtime Pay Is Calculated

The Core Federal Formula: How to Calculate Overtime Pay

At its core, federal overtime law established by 29 U.S.C. § 207(a)(1) states that any non-exempt covered worker who works more than 40 hours in a single workweek must receive overtime compensation at a rate not less than one and one-half times (1.5×) their regular rate of pay for all hours exceeding 40.

Many workers and payroll administrators mistakenly assume that "regular rate" is simply identical to the employee's base hourly wage. While this is true for employees with a single, unvarying hourly wage who receive no other compensation, the statutory definition is much broader. Under 29 C.F.R. § 778.109, the regular rate is determined by dividing the total straight-time earnings in the workweek by the total hours actually worked:

Once the regular rate is established, the total gross pay for the week can be determined using either of two legally recognized equations:

• Method 1 (Standard Cumulative): (40 regular hours × regular rate) + (overtime hours × [regular rate × 1.5]) = Gross Pay
• Method 2 (Straight-Time plus Premium): (Total hours worked × regular rate) + (overtime hours × [0.5 × regular rate]) = Gross Pay

Both methods yield the exact same legal result down to the cent.

Step-by-Step Worked Example: The $945 Paycheck

To see how this arithmetic operates in practice, consider a standard shift worker earning an agreed hourly rate of $18.00 per hour who logs 45 hours during a 7-day payroll cycle without additional bonuses or differentials.

Here is how to calculate overtime pay time and a half step by step:

What Counts as "Hours Worked" (and What Doesn't)

A frequent source of payroll disputes is determining exactly how is overtime hours calculated when a worker takes time off during the workweek. Under federal regulations (29 C.F.R. Part 785), overtime is governed strictly by hours actually and physically worked.

What Counts as Compensable Work Time

Compensable hours worked include all time an employee is required to be on duty, on the employer's premises, or at a prescribed workplace. This includes:

• Productive shift work at your primary workstation or jobsite;
• Mandatory training sessions, morning safety tailgates, and staff meetings;
• Travel between multiple jobsites during the scheduled workday;
• Donning and doffing specialized protective equipment essential to the job;
• On-duty waiting time where the employee is not free to leave or use the time effectively for their own purposes.

What Does Not Count Toward Overtime

Conversely, compensation paid for periods where no actual labor was performed does not accumulate toward the 40-hour overtime trigger:

• Paid Time Off (PTO): Accrued vacation days and personal days;
• Paid Sick Leave: Medical absences compensated through company sick banks;
• Unworked Paid Holidays: Holiday pay for Thanksgiving, Christmas, or Labor Day when the employee did not perform physical labor;
• Ordinary Commute: Normal daily travel between home and the regular workplace;
• Bona Fide Meal Periods: Scheduled lunch breaks of 30 minutes or longer where the worker is completely relieved of all job duties.

The Workweek: A Fixed 7-Day Accounting Period

Under 29 C.F.R. § 778.105, an employee's workweek is a fixed and regularly recurring period of 168 hours—seven consecutive 24-hour periods. It can begin on any designated day and hour (e.g., Sunday at 12:01 AM or Wednesday at 8:00 AM), but once established by the employer, it remains permanent.

Federal law strictly forbids averaging hours across pay periods. If an employer uses a bi-weekly (80-hour) payroll schedule, they cannot average 50 hours worked in Week 1 with 30 hours worked in Week 2 to report 80 total hours and avoid paying overtime. In that scenario, the worker is legally entitled to:

• Week 1: 40 regular hours + 10 overtime hours (paid at 1.5×);
• Week 2: 30 regular hours (paid at straight time).

Each workweek stands entirely on its own individual footing.

Why Daily Overtime Is NOT a Federal Rule

One of the most widespread employment myths is that working more than 8 hours in a single shift automatically earns overtime pay. Under the federal FLSA, how does overtime pay work on long single-day shifts? It does not trigger overtime at all unless the employee's weekly total surpasses 40 hours. An employee working a single 16-hour shift in a week is paid straight time under federal law.

However, state laws can establish more protective rules than the federal floor. Four states mandate daily overtime:

• California: Under Labor Code § 510, daily overtime is triggered after 8 hours in a day (1.5×), double time is triggered after 12 hours (2.0×), and double time applies on the 7th consecutive day. Review our complete guide to California Overtime and Double-Time Rules or test your shifts with the dedicated California Overtime Calculator.
• Alaska: Under AS 23.10.060, overtime is required for hours over 8 per day or 40 per week.
• Colorado: Under COMPS Order #39, overtime is triggered after 12 hours worked in a single workday or 40 hours in a workweek.
• Nevada: Under NRS 608.018, employees earning less than 1.5× the minimum wage receive daily overtime after 8 hours in a 24-hour period.

Common Mistakes When Determining Overtime Pay

Payroll audits conducted by the U.S. Department of Labor Wage and Hour Division (WHD) consistently uncover three major errors that leave workers underpaid:

1. Excluding Non-Discretionary Bonuses from the Regular Rate

When an employer awards bonuses linked to production goals, safety records, or shift attendance, those payments must be factored into the overtime rate. For example, if an employee works 50 hours at $20.00/hour ($1,000 base) and earns a $100 attendance bonus, their total straight-time earnings equal $1,100.

Their true regular rate is $1,100 ÷ 50 hours = $22.00 per hour, not $20.00. The 10 overtime hours must be compensated with an additional half-time premium of $11.00/hour ($110.00), bringing total weekly pay to $1,210.00. Ignoring the bonus underpays the employee by $20.00.

2. Skipping the Weighted Average for Two Different Pay Rates

If an employee works two distinct roles in the same workweek—for example, 30 hours as a warehouse worker at $16.00/hr and 20 hours as a forklift operator at $22.00/hr (50 total hours)—the employer cannot arbitrarily choose the lower $16.00 rate for the 10 overtime hours.

Under 29 C.F.R. § 778.115, the employer must compute a weighted blended rate:

• Warehouse Earnings: 30 hrs × $16.00 = $480.00
• Forklift Earnings: 20 hrs × $22.00 = $440.00
• Total Straight-Time: $480.00 + $440.00 = $920.00
• Weighted Regular Rate: $920.00 ÷ 50 total hours = $18.40/hr
• Overtime Premium (0.5×): 10 overtime hours × $9.20 = $92.00
• Total Gross Compensation: $920.00 + $92.00 = $1,012.00

3. Assuming All Salaried Employees Are Automatically Exempt

Receiving a fixed salary does not legally extinguish your right to overtime. To be legitimately exempt under federal regulations, a salaried employee must pass two separate tests:

• The Salary-Level Test: The employee must receive a guaranteed salary of at least $684 per week ($35,568 annually under restored federal baseline rules, or significantly higher in states like California and New York).
• The Duties Test: The actual daily responsibilities must meet specific statutory criteria for executive, administrative, or professional roles. Job titles alone mean nothing.

Salaried non-exempt workers who work over 40 hours must be paid 1.5× overtime based on their salary divided by their standard weekly hours. For complete details, see our guide to Overtime for Salaried Employees.