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The Calculator App is a free financial calculator suite built for anyone who wants clear, accurate answers — fast. No signup. No ads. No nonsense. Whether you're in the UK, US, or anywhere in the world, we cover the numbers that matter most: mortgage repayments, take-home pay after tax, compound interest, retirement planning, stamp duty, VAT, capital gains, and over 100 more calculators across personal finance, property, tax, savings, and everyday maths. What we cover: UK salary calculator — Income Tax, National Insurance, student loan and pension breakdowns US salary calculator — Federal tax, FICA, and all 50 states Mortgage calculator — including multi-rate, multi-part borrowing and overpayment modelling Stamp duty, ISA, inheritance tax, capital gains, VAT calculators — all updated for 2025/26 Compound interest, retirement, and savings growth calculators for long-term planning Date, percentage, BMI, calorie, and unit converters for everyday use We also publish a free financial education blog covering mortgages, tax, investing, and savings in plain English — no jargon, just actionable numbers. Every calculator is built for accuracy. If you find an error, we fix it the same day. Used by homebuyers, salary negotiators, first-time investors, students, and anyone who wants to understand exactly where their money is going. Free. Always. Worldwide.
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United Kingdom
- thecalculatorapp.org
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