Discover the UK's most popular calculators for 2025. Income tax, mortgage, salary, VAT, BMI and percentage calculators used by millions.
Our most-used calculators, trusted by millions of UK residents for accurate tax calculations, financial planning, and everyday maths. All tools are free, regularly updated with the latest HMRC rates for the 2025/26 tax year, and require no registration.
Calculate your UK income tax, see your tax bands, and work out your take-home pay after PAYE deductions.
Updated with April 2025 rates • Personal Allowance £12,570 #2Add or remove VAT instantly. Supports standard 20%, reduced 5%, and custom VAT rates for any amount.
Used by businesses & consumers • Instant results #3Calculate monthly mortgage payments, total interest, and see amortisation schedules for UK mortgages.
Repayment & interest-only • Current UK rates #4Convert between hourly, daily, weekly, monthly and annual salary. Includes tax and NI deductions.
Gross to net • All pay frequencies #5Calculate your Body Mass Index using NHS guidelines. See healthy weight ranges and get health advice.
NHS-compliant • Metric & Imperial #6Calculate percentages, percentage change, percentage of a number, and reverse percentage calculations.
Multiple calculation types • Instant results #7Calculate your NI contributions for 2025/26. See Class 1, Class 2, and Class 4 NI rates.
Employee & self-employed • Current thresholds #8See your actual net salary after Income Tax, National Insurance, pension, and student loan deductions.
Complete breakdown • All deduction types #9Calculate Stamp Duty Land Tax (SDLT) on property purchases in England and Northern Ireland.
First-time buyers • Additional properties #10Calculate compound interest, savings growth, and see how your money grows over time with different rates.
Compound interest • Goal planningThese ten calculators consistently rank as the most-used tools on our site because they address the everyday financial questions UK residents face. From working out your monthly take-home pay to calculating VAT on business expenses, these tools provide instant, accurate answers.
Our Income Tax Calculator and National Insurance Calculator are updated every April with the latest HMRC rates. For the 2025/26 tax year, the Personal Allowance remains at £12,570, with the basic rate threshold at £50,270. Our calculators reflect these figures and include the reduced NI rates introduced in January 2024.
With UK house prices and mortgage rates constantly changing, our Mortgage Calculator helps buyers estimate monthly payments before applying for a mortgage. Combined with our Stamp Duty Calculator, you can plan the full cost of buying a property in England, Wales, Scotland, or Northern Ireland.
The BMI Calculator uses NHS guidelines to help you understand your weight category and healthy weight range. It's one of our most-accessed health tools, alongside our Calorie Calculator and TDEE Calculator.
The most popular UK calculators in 2025 are: Income Tax Calculator (for calculating PAYE and take-home pay), VAT Calculator (for adding/removing 20% VAT), Mortgage Calculator (for monthly payment estimates), Salary Calculator (for comparing hourly/annual wages), BMI Calculator (for health assessments), Percentage Calculator, National Insurance Calculator, Take Home Pay Calculator, Stamp Duty Calculator, and Savings Calculator.
Yes, all calculators on UK Calculator are completely free to use with no registration required. We provide accurate, HMRC-compliant calculations for income tax, National Insurance, VAT, mortgage payments, and more. Our tools are regularly updated to reflect the latest UK tax rates for the 2025/26 tax year.
Our tax calculators are updated with official HMRC rates for the 2025/26 tax year. The Income Tax Calculator uses the current personal allowance (£12,570), basic rate (20% on £12,571-£50,270), higher rate (40% on £50,271-£125,140), and additional rate (45% above £125,140). We verify all rates against gov.uk sources.
For calculating your take-home pay in the UK, use our Salary Calculator or Take Home Pay Calculator. Enter your gross annual or monthly salary, and the calculator will deduct Income Tax, National Insurance, and optional pension contributions to show your net pay.
Last updated: January 2026 | All calculators verified with latest HMRC 2025/26 rates
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Is this calculator free?
Yes, all our calculators are 100% free to use with no registration required.
Are the results accurate?
Our calculators use verified formulas and are regularly updated for accuracy.
Can I use this on mobile?
Yes, all calculators are fully responsive and work on any device.