Overtime Calculator Uk
Work out overtime pay at any rate — time-and-a-half, double-time, or custom
⏱️ Overtime Calculator
📋 Embed This Calculator
Add the calculator widget (no navigation, no ads) to your website or blog. Copy the code below:
UK Overtime Calculator
This overtime calculator shows how extra hours on top of your contracted work affect your total weekly and monthly earnings. In the UK, there is no statutory right to overtime pay — it depends entirely on your employment contract. However, many employers pay enhanced rates for hours beyond your standard contract.
Common UK overtime structures include time-and-a-half (1.5×), double time (2×), and plain time (1×). Some employers offer TOIL (time off in lieu) instead of payment. Check your contract for the specific terms that apply to you.
Overtime Rate Examples
| Base Hourly | OT Hours | Rate | OT Pay | Total Week |
|---|---|---|---|---|
| £12.50 | 5 | 1.5× | £93.75 | £562.50 |
| £15.00 | 8 | 1.5× | £180.00 | £742.50 |
| £18.00 | 4 | 2× | £144.00 | £819.00 |
| £20.00 | 6 | 1× | £120.00 | £870.00 |
Overtime and Tax
Overtime earnings are taxed at your marginal rate — the same as your regular income. If your base salary is £30,000 and you earn £5,000 overtime, the combined £35,000 falls within the basic rate band (20% + 8% NI). However, if overtime pushes you over £50,270, the excess is taxed at 40%.
Consider whether overtime or salary sacrifice arrangements are more tax-efficient. For your base pro rata earnings, use our pro rata calculator. To check if overtime affects your holiday pay, see our dedicated holiday guide.
How to Use the Overtime Calculator Uk
Using our overtime calculator uk is straightforward. Follow these steps to get accurate results for your situation:
- Enter your full-time salary — This is the annual salary for the equivalent full-time role, before any deductions. You'll find this on the job advert or your contract.
- Set the full-time hours — The standard working week for the role. Most UK employers use 37.5 or 40 hours per week.
- Enter your actual hours — Your contracted weekly hours. This is the number you actually work.
- Click Calculate — The overtime calculator uk displays your results instantly, with annual, monthly, weekly, daily, and hourly breakdowns.
Worked Example: Overtime Calculator Uk
Here's a real-world example using the overtime calculator uk. James earns £14.50 per hour as a warehouse supervisor and works 10 hours of overtime per week at time-and-a-half.
Overtime rate: £14.50 × 1.5 = £21.75 per hour
Weekly overtime pay: £21.75 × 10 = £217.50
Monthly overtime: £217.50 × 52 ÷ 12 = £942.50
Annual overtime: £217.50 × 52 = £11,310
Combined with his standard 40-hour week (£14.50 × 40 = £580/week), James's total annual earnings are £30,160 + £11,310 = £41,470 before tax.
UK Overtime Rules You Should Know
- No legal right to overtime pay: UK law doesn't require employers to pay overtime — it depends on your contract. However, your average hourly pay must not fall below National Minimum Wage when overtime is included.
- Overtime and holiday pay: Since the Bear Scotland v Fulton ruling (2014), regular and systematic overtime must be included in holiday pay calculations. Use our overtime holiday pay calculator.
- Working Time Regulations: You cannot be forced to work more than 48 hours per week on average (over 17 weeks) unless you've opted out in writing.
- Tax on overtime: Overtime is taxed at your marginal rate — if it pushes you into the 40% bracket (above £50,270), you'll pay higher rate tax on the excess.
All calculations on this page follow ACAS pro rata pay guidelines and are consistent with the UK Employment Rights Act 1996. Tax figures use HMRC 2025/26 rates. The April 2025 National Living Wage of £12.21/hour is applied where relevant.
Related Salary Calculators
Our overtime calculator uk is just one of the tools available on ProRataCalculator. You may also find these useful: pro rata calculator, term-time salary calculator, holiday pay guide.
Last updated: February 2026. Verified against HMRC 2025/26 tax rates and April 2025 National Living Wage (£12.21/hour).
Frequently Asked Questions
Overtime is typically calculated as hours worked beyond your contracted hours, multiplied by an enhanced rate. Common rates are time-and-a-half (1.5×) or double time (2×), though there is no legal requirement for enhanced overtime pay.
Yes, overtime pay is fully taxable. It is added to your regular earnings and taxed at your marginal income tax rate, with National Insurance contributions also applied.
There is no legal right to overtime pay in the UK. However, your total pay (including overtime hours) must not fall below the National Minimum Wage when averaged across all hours worked.
Regular, compulsory overtime should be included in holiday pay calculations. Voluntary overtime that follows a regular pattern may also need to be included, following the Bear Scotland case ruling.