Overtime Calculator UK
Our overtime calculator helps you estimate gross overtime pay using either an hourly rate or an annual salary. You can add multiple overtime rows to reflect different overtime rates, including time and a half, double time, custom multipliers or a custom overtime hourly rate.
This makes the tool useful if your overtime is not all paid at the same rate. For example, you may have worked some extra hours at 1.5×, some at 2×, and some at a custom premium. Instead of calculating each one manually, the calculator combines them into a single total.
What this overtime calculator shows
This tool can estimate:
- Equivalent hourly rate from salary
- Total overtime pay across multiple overtime entries
- Total overtime hours
- Average overtime hourly rate
- Gross total for all overtime rows combined
The calculator focuses on gross overtime pay before deductions, so it is best used to compare overtime amounts rather than estimate final take-home pay.
How to use the overtime calculator
Start by choosing whether you are paid hourly or by annual salary. If you are paid hourly, enter your standard hourly rate. If you are salaried, enter your annual salary together with your normal weekly hours and weeks worked per year so the calculator can estimate an equivalent hourly rate.
You can then add one or more overtime rows. For each row, enter the overtime hours and choose how those hours are paid. This allows you to model mixed overtime patterns more realistically than a basic single-rate overtime calculator.
How overtime pay is worked out
Overtime pay is generally calculated by applying an overtime rate to your base hourly rate. If you are salaried, the calculator first estimates an hourly rate using:
Annual salary ÷ (hours per week × weeks worked per year)
Each overtime row is then calculated separately and added together to produce the final gross overtime total.
Can this work for salaried employees?
Yes. If you are salaried rather than paid by the hour, the calculator can estimate a base hourly rate from your salary and working pattern. This is useful if your overtime is paid as a multiple of your normal hourly equivalent.
Because different employers calculate overtime differently, this tool is best used as a guide rather than an exact payroll match.
Why overtime totals can vary
Two people working the same number of overtime hours can still receive different overtime pay. That can happen because of:
- Different base hourly rates
- Different contracted hours or salary assumptions
- Different overtime multipliers
- Custom overtime rates for certain shifts or days
- Different numbers of overtime rows at different rates
What this tool does not include
This calculator does not estimate take-home pay and does not include deductions such as Income Tax, National Insurance, pension contributions, salary sacrifice, unpaid breaks, bonuses or employer-specific payroll rules.
If you want to estimate what overtime leaves you with after deductions, you would need to combine this with a separate take-home pay calculation.
Who this calculator is useful for
This tool may be helpful if you are:
- Checking how much extra pay overtime hours should generate
- Comparing time-and-a-half versus double-time earnings
- Working out overtime from a salaried role
- Adding together multiple overtime rates in one calculation
- Sense-checking an employer overtime estimate
Important note
This calculator provides an estimate of gross pay before deductions. It does not include income tax, National Insurance, pension contributions, salary sacrifice, unpaid breaks, bonuses or employer-specific payroll rules. Actual pay may differ depending on your contract, overtime policy and payroll setup.
Use the UK Fin Lab overtime calculator
Use the UK Fin Lab overtime calculator above to estimate overtime pay quickly and compare how different overtime rates affect your total gross overtime earnings.