Hourly Rate Change Calculator
Calculate your new annual salary when your weekly hours change
Your Details
By using this calculator, you agree to our Privacy Policy and Terms.
Results
Hourly rate and new annual salary
Enter your salary and hours to see results.
How to Use This Calculator
This calculator is for anyone whose weekly hours are changing — whether you're going part-time, moving to full-time, or negotiating a new schedule. Enter three numbers and see the full tax impact instantly.
- Current annual salary — your gross salary at your current hours.
- Current weekly hours — how many hours per week you work now (e.g. 37.5).
- New weekly hours — the hours you're moving to. The calculator will work out your new pro-rata salary and its full tax breakdown.
What the Calculator Shows
- New annual salary — your gross pay scaled to the new hours.
- Hourly rate — your equivalent hourly rate derived from your current salary and hours.
- Difference — the annual gross change between old and new salary.
- Full tax breakdown — income tax, National Insurance, and net take-home on the new salary, annually and monthly.
When This Is Useful
- Going part-time — see exactly how much less you'll take home before agreeing to reduced hours. The after-tax drop is often smaller than the gross figure suggests, since your tax and NI bills also fall.
- Returning from parental leave — model different hours arrangements to find the right balance between income and flexibility.
- Overtime or extra hours — check whether additional hours push you into a higher tax band, and how much of each extra hour you actually keep.
- Negotiating a condensed week — same total hours, different schedule. Verify the salary stays the same.
UK Income Tax Rates 2025/26
| Band | Taxable Income | Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic Rate | £12,571 – £50,270 | 20% |
| Higher Rate | £50,271 – £125,140 | 40% |
| Additional Rate | Above £125,140 | 45% |
England, Wales & Northern Ireland rates. NI: 8% on £12,570–£50,270, 2% above. Personal Allowance tapers above £100,000.
Frequently Asked Questions
How is my new salary calculated?
Your new salary is calculated pro-rata: (new hours ÷ current hours) × current annual salary. For example, reducing from 37.5 to 30 hours gives you 80% of your current salary.
Will going part-time change my tax band?
It may. If your new salary falls below a tax band threshold (e.g. below £50,270), you'll drop to a lower marginal rate. The calculator shows your full tax breakdown at the new salary so you can see exactly where you land.
Does the calculator account for pension contributions?
This calculator shows the standard PAYE position without pension deductions. To model pension contributions use the full UK Salary Calculator which supports salary sacrifice, net pay, and relief-at-source pensions.
What if my hours vary week to week?
Enter your average weekly hours as the new figure. If you have a guaranteed minimum contract, use the minimum hours to see your worst-case take-home.