Overtime Calculator UK

Calculate Overtime Pay Regular + Overtime

Hourly Rate (£)

Your standard hourly rate.

Regular Hours Per Week

Your standard contracted hours per week.

Overtime Hours Per Week

Additional hours worked beyond regular.

Overtime Multiplier

1.5 = time-and-a-half, 2.0 = double-time.

Weeks Worked Per Year (for annualisation)

Number of weeks you work per year.

Tax Year: 2025/26 — Includes estimates for Income Tax & NI

Example £15/hr, 37.5hrs regular, 5hrs overtime (1.5x) → £675 total weekly

Overtime Summary

Enter your hours and rate, then click Calculate Overtime.

What Is an Overtime Calculator?

An overtime calculator helps you calculate your overtime pay, regular pay and total earnings. This overtime calculator UK shows you how much extra you earn when you work overtime, and how it affects your take-home pay after tax and National Insurance.

How to Use the Overtime Calculator

Enter your hourly rate, regular hours, overtime hours and overtime multiplier. Click Calculate Overtime to see your regular pay, overtime pay, total pay and tax/NI estimates.

How Overtime Pay Is Calculated

Regular Pay = Hourly Rate × Regular Hours
Overtime Pay = Hourly Rate × Overtime Hours × Overtime Multiplier
Total Pay = Regular Pay + Overtime Pay

Overtime Example

Example: Hourly rate £15, regular hours 37.5, overtime hours 5, overtime multiplier 1.5

Regular pay: £15 × 37.5 = £562.50
Overtime pay: £15 × 5 × 1.5 = £112.50
Total weekly pay: £675.00
Increase: +£112.50 (20% more)

Common Overtime Rates

Time-and-a-half: 1.5 × hourly rate (most common)
Double-time: 2.0 × hourly rate (weekends, bank holidays)
Time-and-a-quarter: 1.25 × hourly rate (less common)
Normal rate: 1.0 × hourly rate (if overtime isn't at a premium)

How Overtime Affects Tax and NI

Overtime pay is subject to Income Tax and National Insurance just like regular pay. The additional earnings may push you into a higher tax bracket. This calculator estimates the tax and NI on your overtime earnings.

Overtime vs Regular Pay Comparison

Comparison: £15/hour, 37.5 regular hours, 5 overtime hours at 1.5x

Regular weekly pay: £562.50
Overtime pay: £112.50
Total pay: £675.00
Increase: +20%

Annualised Overtime Earnings

If you work overtime regularly, it can significantly increase your annual earnings. This calculator shows you the annualised impact of your overtime.

Overtime and Take-Home Pay

Your take-home pay from overtime is less than the gross overtime pay due to tax and National Insurance. This calculator estimates your net overtime earnings.

Common Overtime Mistakes

Forgetting the overtime multiplier — overtime is usually paid at a higher rate.
Not including overtime in annual income — it increases your total earnings.
Ignoring tax and NI — overtime is subject to deductions.
Using the wrong multiplier — check your employment contract.
Not accounting for hours worked — ensure hours are accurate.

Important: This calculator provides estimates only. Actual overtime pay may differ based on your employment contract, tax code and employer policies. Always check your payslip for exact figures.

Important Assumptions and Limitations

Tax year: 2025/26
Personal Allowance: £12,570 (standard)
Assumes regular overtime pattern
No other deductions (pension, student loans) are included
Results are estimates, not exact payroll calculations

Frequently Asked Questions

What is an overtime calculator? +

How is overtime pay calculated? +

What is the overtime multiplier? +

Does overtime pay include tax? +

How much is 5 hours overtime at £15? +

Does overtime affect my take-home pay? +

Are the results exact? +

Written and reviewed by Abdul Wahid

Financial content specialist with a focus on UK tax, payroll and personal finance tools.

For more detailed calculations, visit our Tax Calculator UK or Salary Calculator UK. For hourly to salary conversion, try our Hourly to Salary Calculator.