Calculators
Quick, accurate calculators for everyday math — percentages, BMI, compound interest, unit conversions and date differences. Get instant results without any spreadsheets.
BMI Calculator
Calculate your Body Mass Index quickly
Percentage Calculator
Calculate percentages with ease
Date & Age Calculator
Days between dates, age, and add or subtract time
Unit Converter
Convert length, weight, temperature and more
Number Formatter
Format numbers, convert currency and mask documents
Free Online Calculators for Everyday Maths
A handful of calculation types come up again and again in daily life and professional work: figuring out what percentage one number is of another (or what a discount means in real money), checking body mass index against healthy ranges, measuring the gap between two dates in days or working days, converting between metric and imperial units of length, weight, volume, temperature, and speed, and formatting numbers with the correct thousands separator and decimal symbol for a given locale. Fastway Tools packages five focused, fast calculators that handle exactly these tasks — no bloated spreadsheet required, and no need to remember a formula.
All calculations are performed locally in your browser with no data sent to any server, so figures about your health, finances, or business remain entirely private. The calculators are designed for accuracy: percentage results include reverse-percentage helpers, the date calculator handles leap years and calendar edge cases, and the unit converter covers dozens of subcategories so you rarely need a second lookup. Bookmark this category to have reliable, no-frills maths tools always within reach.