All free UK calculators & tools
19 private, client-side tools for UK money maths and everyday tasks — mortgage and stamp duty, take-home pay and National Insurance, loans, fuel cost, plus JSON, Base64 and regex utilities. No signup. No database of your inputs.
Finance & Money
Mortgages, tax, stamp duty and money calculators for the UK.
- UK Mortgage CalculatorEstimate monthly mortgage repayments from loan amount, rate and term.
- UK Stamp Duty CalculatorCalculate SDLT, LBTT and LTT for England, NI, Scotland and Wales.
- UK Income Tax / Take-home Pay CalculatorEstimate income tax, National Insurance and take-home pay (UK).
- UK National Insurance CalculatorEstimate employee, employer and self-employed National Insurance from earnings.
- UK VAT CalculatorAdd or remove UK VAT at 20%, 5% or 0% — net, VAT and gross.
- Compound Interest / Savings CalculatorProject savings growth with compound interest and monthly contributions.
- UK Student Loan Repayment CalculatorEstimate Plan 1, 2, 4, 5 and postgraduate loan deductions from income.
- Credit Card Payoff CalculatorSee how long to clear a card balance and total interest at a fixed payment.
- Inflation & Real Return CalculatorSee how inflation erodes cash and what a return is worth in today’s money.
- Loan Repayment CalculatorEstimate monthly payments for personal loans, car finance and fixed-term credit.
Health & Fitness
Simple health metrics and wellness calculators.
Developer Tools
JSON, Base64, regex and other utilities for developers.
Everyday Utilities
Percentage, units, text tools and day-to-day helpers.
- Percentage CalculatorWork out percentages, increases, decreases and “what percent of”.
- Unit ConverterConvert length, weight, temperature and volume units instantly.
- Text Case Converter & Word CounterChange text case and count words, characters and sentences.
- UK Fuel Cost CalculatorEstimate petrol or diesel cost from miles, MPG or L/100km and price per litre.
- UK Working Days CalculatorCount working days between two dates with England & Wales bank holidays.
Why use free UK calculators online?
High-intent questions — monthly mortgage cost, stamp duty by nation, take-home pay, or National Insurance — deserve a clear answer without an app install or email gate. Each tool includes how-to steps, FAQs and plain-English context so you understand the estimate, not just a single number.
Finance figures are guidance only. Tax bands, NI thresholds and stamp duty rules change — confirm important decisions with HMRC, a lender, solicitor or qualified adviser. Developer utilities (JSON, Base64, regex) process data only in your browser.