How Is Overtime Pay Calculated in the USA?

If your paycheck ever looked bigger than expected after a busy week, overtime is usually why. But the way it actually gets calculated trips a lot of people up, not because the math is hard, but because nobody explains it in plain terms. This is that explanation, with the formula, real numbers, and the exceptions that usually cause confusion.

What Overtime Pay Actually Means

Overtime pay is the extra compensation an eligible employee earns for hours worked beyond a set threshold, in the U.S., that threshold is 40 hours in a single workweek. It's not a bonus or a discretionary perk; for employees who qualify, it's a legal requirement under the Fair Labor Standards Act (FLSA), the federal law that governs minimum wage and overtime rules nationwide.

The standard rate is 1.5 times your normal hourly pay, commonly called "time and a half." Work 45 hours in a week at $20 an hour, and those last 5 hours aren't paid at $20, they're paid at $30.

The Federal 40-Hour Rule

The FLSA's overtime rule is built around the workweek, not the workday. A workweek is a fixed, recurring period of 168 hours, seven consecutive 24-hour days, that an employer sets and can't change on a whim to dodge overtime obligations. It doesn't have to run Monday to Sunday; it just has to stay consistent.

Once total hours worked in that window cross 40, every hour after that is overtime. Working four 10-hour days, for instance, doesn't trigger overtime on its own under federal law, because the weekly total is still 40 hours, even though a single day exceeded 8 hours.

Who's Eligible, and Who Isn't

Eligibility comes down to a classification: non-exempt or exempt.

Non-exempt employees are covered by the FLSA's overtime rule. Most hourly workers fall into this bucket by default, and so do many salaried employees, depending on their job duties and pay level.

Exempt employees fall outside the overtime requirement. This usually applies to salaried workers in executive, administrative, professional, outside sales, or certain computer-related roles who meet both a minimum salary threshold and a "duties test" set by the Department of Labor. Job title alone doesn't decide this, a "manager" who spends most of their time on non-managerial tasks may still be legally non-exempt.

If you're unsure which category you fall into, check your offer letter or ask HR directly, misclassification happens more often than people assume, and it directly affects whether you're owed overtime at all.

Regular Rate of Pay vs. Overtime Rate

Your regular rate is your standard hourly pay, straightforward if you're paid hourly, a little more involved if you're salaried or earn commissions and non-discretionary bonuses (more on that below).

Your overtime rate is that regular rate multiplied by 1.5. It's the rate that applies specifically to hours worked past 40 in the workweek, your first 40 hours are still paid at your normal rate.

The Overtime Pay Formula

Here's the calculation broken into three steps:

1. Regular pay = hourly rate × 40 hours
2. Overtime rate = hourly rate × 1.5
3. Overtime pay = overtime rate × (total hours − 40)

Add regular pay and overtime pay together, and you get total weekly pay.

Worked Examples

$20/hour, 45 hours worked: Regular pay is $20 × 40 = $800. Overtime rate is $20 × 1.5 = $30. Overtime pay is $30 × 5 = $150. Total: $950.

$25/hour, 48 hours worked: Regular pay is $25 × 40 = $1,000. Overtime rate is $37.50. Overtime pay is $37.50 × 8 = $300. Total: $1,300.

$30/hour, 50 hours worked: Regular pay is $30 × 40 = $1,200. Overtime rate is $45. Overtime pay is $45 × 10 = $450. Total: $1,650.

Under 40, Exactly 40, and Over 40 Hours

Work fewer than 40 hours and there's no overtime, you're paid your regular rate for however many hours you actually worked (assuming you're hourly; salaried employees are typically paid their full salary regardless, within reason). Hit exactly 40 hours, and you're still in regular-pay territory; overtime only applies once you go past that number. Cross 40, and every additional hour, not the whole week, gets the 1.5x treatment.

Does Weekend or Holiday Work Count?

A common misconception: working Saturday, Sunday, or a holiday doesn't automatically mean overtime pay under federal law. What matters is your total weekly hours. If those weekend hours push you past 40 for the week, they're overtime, not because they fell on a weekend, but because of the running total. Some employers voluntarily offer weekend or holiday premiums as a matter of company policy, which is separate from the federal requirement.

Does Your Pay Period Matter?

Overtime is always calculated per workweek, regardless of how often you're actually paid. If your company runs biweekly payroll, that pay period still contains two separate workweeks, and overtime is figured for each one individually, hours can't be averaged across the two weeks to dodge the 40-hour threshold.

State Rules Can Go Further Than Federal Law

Federal law sets the floor, not the ceiling. Several states layer on additional protections, California and Alaska, for example, require daily overtime after 8 hours in a single day, separate from the weekly 40-hour rule, and California also mandates double time in specific situations. If you're in a state with its own labor code, whichever rule benefits the employee more, state or federal, is the one that applies. It's worth a quick check of your specific state's labor department site if your hours vary a lot day to day.

Can Overtime Be Paid at More Than 1.5x?

Yes. 1.5x is the federal minimum, not a cap. Some employers pay double time for holidays, extreme hours, or under union agreements, and some states mandate it in particular circumstances. Always check your specific employment contract or company handbook rather than assuming time-and-a-half is the final word.

How Salaried Nonexempt Employees Calculate Overtime

Being salaried doesn't automatically mean no overtime, that depends on the exempt/non-exempt classification covered earlier. For salaried non-exempt employees, the trick is converting salary into an hourly equivalent first. A common method: divide the weekly salary by 40 to get a regular hourly rate, then apply the standard 1.5x formula from there. The exact method can vary depending on how the salary is structured (weekly, biweekly, monthly), so this is an area where it's worth double-checking against your company's specific payroll practice.

Bonuses and the Regular Rate

Non-discretionary bonuses, ones tied to performance, attendance, or production targets, generally have to be factored into the regular rate used for overtime calculations, which can push the effective overtime rate slightly above a simple 1.5x of base hourly pay. Purely discretionary bonuses (a surprise holiday gift, for example) typically don't need to be included. This is a nuanced area of payroll, and it's one of the more common sources of underpaid overtime when it's overlooked.

A Quick Note on Overtime and Taxes

Overtime pay is taxed as ordinary income, there's no special "overtime tax rate." It can look more heavily taxed on a given paycheck because of how payroll withholding treats larger checks, but it evens out at tax filing time. We've covered this in more depth in a separate article on overtime and taxes, if you want the full breakdown.

Common Overtime Calculation Mistakes

• Averaging hours across two weeks in a biweekly pay period instead of calculating each workweek separately
• Assuming a salaried role is automatically exempt from overtime
• Leaving non-discretionary bonuses out of the regular-rate calculation
• Assuming weekend or holiday hours are automatically paid at a premium
• Ignoring state-specific daily overtime rules where they apply

Using an Overtime Pay Calculator

Doing this by hand is fine for a single check, but it gets tedious fast if you're comparing scenarios or double-checking a pay stub. Plug in your hourly rate, hours worked, and overtime multiplier into our Overtime Pay Calculator, and it handles the regular pay, overtime pay, and total in one go, useful for quickly sanity-checking whether a paycheck looks right.

For example, entering $22/hour and 46 hours worked returns regular pay of $880, overtime pay of $198 (6 hours × $33), and a total of $1,078 for the week.

Limitations Worth Knowing

An overtime calculator estimates pay based on standard federal assumptions. It won't automatically account for state-specific daily overtime rules, union contract terms, or how your particular employer treats bonuses in the regular-rate calculation. Treat the output as a solid estimate to check your math against, not a replacement for your actual pay stub or a conversation with HR if something looks off.

Frequently Asked Questions

This article is for general informational purposes and isn't legal or tax advice. Overtime rules can vary by state and employer policy, check with your HR department or a qualified professional for guidance on your specific situation.