Overtime Calculator: Time-and-a-Half Pay Explained

An overtime calculator for time and a half estimates the pay for eligible overtime hours at 1.5 times a regular hourly rate. Enter your hourly rate and overtime hours to see the overtime rate and pay; the estimate does not determine whether a particular job qualifies for overtime.

Formula

Overtime pay = regular hourly rate × 1.5 × overtime hours. The time-and-a-half rate is the regular hourly rate multiplied by 1.5. In the calculator, rate is the regular hourly rate in dollars per hour, hours is the number of overtime hours, ot_rate is the overtime hourly rate in dollars per hour, and pay is overtime pay in dollars. The calculation assumes every entered overtime hour is paid at the same 1.5 multiplier.

Worked Example

Using the calculator’s default values—a regular rate of $20 per hour and 5 overtime hours:

1. Calculate the overtime rate: $20 × 1.5 = $30 per hour.
2. Multiply that rate by the overtime hours: $30 × 5 = $150.

The result is $150 in time-and-a-half overtime pay, before any deductions or other pay adjustments. This is the overtime portion only, not total pay for the work period.

What Time and a Half Means

“Time and a half” means 150% of the regular hourly rate: the worker receives the ordinary rate plus an additional half of that rate for each applicable overtime hour. If the regular rate is $24 per hour, for example, the time-and-a-half rate is $36 per hour. Four such overtime hours would produce $144 in overtime pay.

That $144 represents payment for the four overtime hours at the full 1.5 rate. If you are calculating the extra premium alone, rather than the full overtime-hour payment, the premium is half the regular rate multiplied by those hours: $12 × 4 = $48. Do not add the regular-rate portion a second time if your calculator or payroll figure already includes the full 1.5 rate.

How to Use the Calculator

• Enter the regular hourly rate in the same currency as the result. For example, enter 20 for $20 per hour, not 2,000 for an annual salary.
• Enter the number of hours that should be paid at the time-and-a-half rate. Use a decimal for partial hours, such as 2.5 for two hours and 30 minutes.
• Read the first result as the estimated overtime pay, then check the separate overtime-rate result.
• For a combined gross-pay estimate, add this result to the pay for ordinary hours and any other applicable compensation. Avoid counting overtime hours twice.

The calculator accepts hours as a decimal, not as clock notation. For instance, 1 hour 45 minutes is 1.75 hours, because 45 minutes is 45 ÷ 60 of an hour. Entering 1.45 would mean 1 hour and 27 minutes, not 1 hour and 45 minutes.

Eligibility, Workweeks, and Pay Rules

The arithmetic is straightforward, but deciding which hours and rate belong in it can be more complicated. Overtime rules differ by jurisdiction, job classification, and pay arrangement. In the United States, federal rules under the Fair Labor Standards Act generally use a workweek basis for covered, nonexempt employees, but exemptions and other requirements can affect the calculation. State or local rules may provide additional protections. Do not assume that hours beyond a daily schedule automatically count as overtime under every rule.

For a U.S. federal calculation, a workweek is generally a fixed, recurring period of 168 hours—seven consecutive 24-hour periods. Hours from separate workweeks generally cannot simply be averaged to decide whether a weekly overtime threshold was reached. The relevant threshold, coverage, exceptions, and any more protective local rules should be checked for the worker and location. This calculator supplies a mathematical estimate, not a legal eligibility decision.

Some workers are paid by salary, piece rate, commission, or a combination of methods rather than a simple hourly wage. In those cases, the regular rate used for an overtime calculation may not equal an obvious hourly figure; the applicable rules may require including certain compensation or using a particular method. A fixed salary alone does not establish that a worker is exempt from overtime. Check reliable government guidance or a qualified payroll or legal professional when classification or rate calculations are uncertain.

Common Calculation Problems and Limits

• Using the wrong rate: The input is the regular hourly rate relevant to the calculation, not necessarily take-home pay or a rate after deductions.
• Mixing up full pay and premium: The formula returns the full 1.5-rate payment for the hours entered. The extra half-rate premium is a different figure.
• Rounding too early: Keep the rate and hours precise through the multiplication, then round the final currency result to two decimal places. Payroll rounding practices can differ.
• Combining rates or periods: If hours are paid at different rates, or a work period includes multiple kinds of compensation, a single rate multiplied by all hours may not represent the correct calculation.
• Assuming every overtime hour uses 1.5: This tool calculates only the stated multiplier. It does not model other premiums, special schedules, deductions, taxes, or jurisdiction-specific rules.

For a quick check, calculate the hourly overtime rate first, then multiply by the qualifying hours. If the regular rate is $18.75, time and a half is $28.125 per hour; for 3 hours the unrounded product is $84.375, or $84.38 when rounded to cents. Actual payroll records may follow applicable rounding and pay rules.

Frequently Asked Questions

How do I calculate time and a half?
Multiply the regular hourly rate by 1.5 to get the overtime rate, then multiply that rate by the overtime hours. At $20 per hour for 5 hours, the calculation is $20 × 1.5 × 5 = $150.

Does time and a half mean an extra 50%?
Yes. It means the full payment rate is 150% of the regular rate. If you want only the additional premium, calculate 50% of the regular rate and multiply by the relevant hours.

How do I calculate time and a half from an annual salary?
You first need a suitable regular hourly rate. Dividing annual salary by expected annual work hours can give a rough hourly equivalent, but it may not be the legally applicable regular rate. Compensation, schedule, classification, and local rules can matter.

Is overtime calculated daily or weekly?
It depends on the applicable jurisdiction and rules. For U.S. federal overtime, the general framework is based on a workweek for covered, nonexempt employees; some state or local requirements may differ or add protections.

Does this result include taxes and deductions?
No. It is a gross-pay estimate for the entered overtime hours. It does not calculate withholding, deductions, ordinary-hours pay, or other compensation.

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in rate | Regular hourly rate | $/hour | 20 | 0
in hours | Overtime hours | hours | 5 | 0
out pay | Time-and-a-half overtime pay | $ | rate * 1.5 * hours | 2
out ot_rate | Overtime hourly rate | $/hour | rate * 1.5 | 2