General Tools
General Tools & Calculators
Handy everyday calculators and conversions — percentages, discounts, currencies and units, all in one place.
% Percentage Calculator Work out percent of a number, a share of a total, and percentage change. 🏷️ Discount Calculator Find the sale price, amount saved and final price after an optional tax. 💱 Currency Converter Convert between currencies using an exchange rate you enter. 📐 Unit Conversion Calculator Convert length, mass, area, volume and temperature units.
About general tools
Not every calculation is strictly financial — sometimes you just need a quick percentage, a sale price, a currency conversion or a unit swap. These general-purpose tools handle the everyday maths: multiple percentage operations on one page, discounts with optional tax, a transparent currency converter that uses a rate you enter, and a unit converter spanning length, mass, area, volume and temperature. They are free, run instantly in your browser, and show the method behind each result.
Several percentage operations in one
Sale price with optional tax
Transparent currency conversion
Metric and imperial unit conversion
Instant, free, no sign-up