The calculators section covers a broad range of everyday maths — from a quick percentage calculator and an age calculator to geometry tools like the right-angled triangle calculator. The collection also includes reviewed financial and health calculators: a BMI calculator with ranges based on NHS guidance, a loan repayment calculator, a compound interest calculator, a VAT calculator using standard HMRC rates, and a fraction calculator for adding, subtracting, multiplying and dividing fractions. The health and financial tools cite authoritative UK sources so you can trust the thresholds and rates they use. Every calculator runs entirely in your browser — nothing you type is sent to a server, and there is nothing to install.
Calculators
Fast, accurate calculators for everyday maths — percentages, geometry and more.
Percentage Calculator
Work out what one number is as a percentage of another, instantly.
Right-Angled Triangle Calculator
Find the missing side or angle of a right-angled triangle, with a diagram.
BMI Calculator
Work out your Body Mass Index from your height and weight, in metric or imperial.
Loan Repayment Calculator
Estimate the monthly payment, total interest and total cost of a loan.
Compound Interest Calculator
See how savings grow with compound interest and regular contributions.
Age Calculator
Work out an exact age in years, months and days from a date of birth.
VAT Calculator
Add UK VAT to a price, or work out the pre-VAT price by removing it — 20% standard or 5% reduced.
Fraction Calculator
Add, subtract, multiply or divide fractions — with the answer shown as a fraction, mixed number and decimal.