Free · 2026/27 rates · No sign-up
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The calculators people need most, from take-home pay to loan repayments. Each one explains how the result is worked out, with real examples.
Recently used
Money & finance
- Take-Home Pay Calculator (UK 2026/27)Work out your take-home pay after Income Tax, National Insurance, pension and student loan, or find the salary you need for a target net pay.
- Loan Repayment CalculatorWork out the monthly repayment, total interest and full repayment schedule for a personal loan, car loan or any fixed-rate loan.
- Compound Interest CalculatorSee how your savings grow with compound interest and regular monthly deposits, with an optional tax rate on interest.
- VAT Calculator (Add or Remove VAT)Add VAT to a net price or remove VAT from a gross price at the UK rates of 20%, 5% and 0%, or any custom rate.
- Currency ConverterliveConvert pounds, euros, dollars and 17 other currencies using the latest European Central Bank reference rates.
- Gold Value CalculatorliveEstimate the value of gold jewellery, coins or bars in pounds from the carat and weight, using the latest gold spot price.
- Percentage CalculatorWork out a percentage of a number, what percent one number is of another, percentage change, or add and subtract a percentage.
Everyday life
- Days Between Dates CalculatorCount the number of days, weeks, weekdays and months between two dates, with the option to include the end date.
- Age CalculatorCalculate your exact age in years, months and days, your age in days and weeks, and how long until your next birthday.
- BMI CalculatorCalculate your body mass index (BMI) from your weight and height, see your category and the healthy weight range for your height.
Why Calcavi?
Clear explanations
Every calculator shows the formula, the rules behind it and worked examples with real numbers.
Up-to-date data
Exchange rates and the gold price update automatically from official and market sources.
Completely free
No account, no limits. Your numbers are calculated on your device and never sent anywhere.