About OvertimeCalculator.uk

OvertimeCalculator.uk was built to answer one recurring question for UK workers: "how much is my overtime actually worth?" Rather than leaving that to guesswork or a pocket calculator, we built a free, mobile-friendly tool that works out gross overtime pay instantly, alongside plain-English guidance on how UK overtime rates, tax and holiday pay actually work.

What we do

Our main calculator lets you enter an hourly rate or annual salary, your normal weekly hours, and one or more overtime entries with their own multiplier (1x, 1.25x, 1.5x, 2x or a custom rate). It instantly works out your normal hourly rate, overtime hourly rate, gross overtime pay, total weekly pay, and estimated annual figures. We also publish focused calculators for time and a half, double time, salary-to-hourly conversion, and a rough overtime tax estimate, for when you only need one specific figure quickly.

Why we built it this way

Overtime rules in the UK are often misunderstood. Many people assume there is a legal right to time and a half or double time; there is not. We deliberately explain this clearly throughout the site, rather than implying a fixed legal rate exists, because getting this wrong can lead to real confusion with an employer. Our content links back to GOV.UK and Acas wherever a legal point is made, so you can always check the primary source.

What OvertimeCalculator.uk is not

We are not a payroll provider, an accountancy firm, or a source of legal advice. Our calculators produce estimates to help you understand your pay, not exact payslip figures, and our guidance is general information rather than advice tailored to your specific contract. For anything contractual or legally binding, always check your own employment contract, staff handbook, or speak to Acas or a qualified adviser.

Get in touch

If you spot an error, have a suggestion, or want to ask about the site, visit our contact page. We read every message.