Free UK Calculators
Simple. Fast. Accurate.
Salary, mortgage, VAT, tax, BMI and more — all sourced from official HMRC and gov.uk data. No sign-up needed.
How do you compare to UK workers?
eBay & Vinted Tax Calculator
Selling online? Find out exactly what you owe HMRC — and whether eBay, Vinted or Etsy has already reported you under new DAC7 rules. All sourced from gov.uk.
All Calculators
Pick a calculator below — all free, all updated for 2025-26.
💼 Tax & Income
🏠 Property
💰 Savings & Investments
Pension Tax Relief
See exactly how much pension contributions save you in tax
Capital Gains Tax
Calculate CGT on shares, property and other assets
Compound Interest
See how your savings and investments grow over time
NEWFIRE Calculator
Find out when you can retire early — based on your savings rate
NEWBudget Planner
Track monthly income vs expenses with the 50/30/20 rule — auto-saved
🧮 VAT & Business
🎓 Student & Benefits
🔢 Everyday
Percentage Calculator
Calculate percentages, discounts and changes instantly
Discount Calculator
Calculate final price after any discount instantly
Tip Calculator
Split the bill and calculate tips for any group
Loan Calculator
Monthly repayments and total cost of any personal loan
BMI Calculator
Calculate your Body Mass Index using NHS guidelines
NEWDays Working for HMRC
See how many of your 260 working days go to the government
NEWCost of Living by City
Does your salary go further in Manchester or London?
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Why CalcSimplr?
Instant results
No waiting, no sign-up. Results update as you type.
Works on mobile
Designed for phones first — not an afterthought.
UK 2025-26
Always up to date with the latest HMRC tax rates.
Tax-saving tips
Each calculator shows you how to legally pay less tax.
Save your work. Access it anywhere.
Create a free account to save your calculations across devices and get personalised insights.
Budget Planner
Saved across all your devices
FIRE Projections
Track your retirement timeline
Salary History
Compare year on year
Tax Alerts
Personalised tips for your situation
Not sure where to start?
The salary calculator is the most popular — find out your exact take-home pay in seconds.
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