Overtime Pay Calculator

This overtime pay calculator estimates gross pay from a base hourly rate, regular hours, overtime hours, and overtime multiplier. It shows the overtime rate, overtime pay, regular pay, total pay, and total hours.

Use Regular + OT when you want a full gross pay total, OT Only when you only need the value of extra hours, or From Total when you have a total pay amount and want to estimate the overtime hours implied by it.

The calculator uses the multiplier you choose; it does not decide whether you are legally entitled to overtime, which multiplier applies, or how tax and payroll deductions affect take-home pay.

If your normal rate is GBP 18 per hour and overtime is paid at time and a half, your overtime rate is GBP 27 per hour. Five overtime hours would add GBP 135 before tax and deductions.

If overtime is paid at double time, the same five hours would add GBP 180 before tax and deductions.

Compare the calculator result with your contract, rota, and payslip. Check whether overtime is rounded, capped, paid later, or treated differently on weekends and holidays.

Remember that gross overtime pay is not the same as take-home pay after tax, pension contributions, and other payroll deductions.

The calculator uses the multiplier you enter, such as 1.25x, time and a half, or double time. It does not decide which rate your employer must use.

Regular plus overtime mode gives a gross total for the period, while overtime-only mode isolates the value of the extra hours.

From Total mode is useful for checking whether a gross pay figure implies a certain number of overtime hours, but payslip deductions can still change net pay.

Use the result as a pay check, rota comparison, or negotiation aid, then compare it with your contract, policy, and actual payslip.

Using a time-and-a-half or double-time rate because it sounds standard, instead of using the rate that applies to your job.

Comparing gross overtime pay with take-home pay after tax, pension, student loans, benefits, or other payroll deductions.

Assuming overtime is guaranteed. If hours vary, run conservative and optimistic scenarios rather than relying on one busy week.

Use hourly to salary if you want to annualise regular hourly work before adding occasional overtime.

Use pay raise when the question is a permanent rate or salary increase rather than extra hours for one period.

Use salary after tax when the key question is how much of overtime pay may remain after deductions.

Rerun the calculation whenever your base rate, overtime multiplier, rota, paid period, or total pay figure changes.

Check both a typical week and a busy week if overtime is irregular, because annualising one unusual period can exaggerate earnings.

Keep the base rate and multiplier visible when discussing pay, because those two assumptions drive the overtime result.