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Free calculators, converters and everyday utilities. No sign-up, no clutter, and most run privately in your browser.
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Popular tools
Percentage Calculator
Calculate percentages, percentage change and reverse percentages instantly.
Age Calculator
Find your exact age in years, months and days, and the days until your next birthday.
Compound Interest Calculator
See how savings or investments grow with compound interest and regular contributions.
Loan & Monthly Payment Calculator
Work out monthly payments, total interest and the full amortisation schedule for any loan.
Unit Converter
Convert length, weight, temperature, volume, area, speed and more between metric and imperial units.
Word & Character Counter
Count words, characters, sentences and paragraphs, and estimate reading time.
Password Generator
Create strong random passwords locally in your browser. Nothing is sent or stored.
QR Code Generator
Turn any link or text into a QR code and download it as PNG or SVG.
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Featured guides
How compound interest works
Why interest on interest makes balances grow faster over time, with the formula and a worked example.
How to calculate percentages
The four percentage calculations you will actually use, with formulas and worked examples.
How VAT works in the UK
A plain-English explanation of UK VAT: the three rates, how to add and remove VAT, and where to check the official rules.
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Text, images and numbers are processed in your browser wherever possible.
Local where it matters
Tax tools use country-specific data with a cited official source and a verification date.