10 free maths tools: percentage calculator, unit converter, fraction simplifier, currency converter, BMI, scientific calculator, geometry, time duration, discount, random number generator.
Mathematics is essential for everyday tasks — from shopping discounts and cooking measurements to financial planning and DIY projects. Our free maths tools provide accurate calculations for percentages, unit conversions, fractions, geometry, and more — all without any signup or cost. Processing happens locally in your browser for complete privacy.
Our percentage calculator handles four common scenarios: finding a percentage of a number, calculating what percent one number is of another, and applying percentage increases or decreases. The discount calculator shows original price, savings, discounted price, and final price including tax — perfect for shopping comparisons or pricing strategies.
The unit converter handles length (metres, feet, miles), weight (kilograms, pounds, ounces), volume (litres, gallons), and temperature (Celsius, Fahrenheit, Kelvin) — essential for travel, cooking, shipping, and international work. Our currency converter provides exchange rates between major world currencies (GBP, USD, EUR, JPY, CAD, AUD, CHF, CNY) with live rate updates.
The fraction calculator simplifies fractions and performs addition, subtraction, multiplication, and division with step-by-step decimal equivalents. Our geometry calculator computes area, perimeter, surface area, and volume for circles, squares, rectangles, triangles, spheres, and cubes. The scientific calculator includes square roots, powers, trigonometric functions (sin, cos, tan), and logarithmic functions (log, ln) — useful for students and professionals.
The BMI calculator works with metric or imperial units to assess weight status based on NHS guidelines. Our time duration calculator computes hours and minutes between two times for work shifts, travel planning, or project tracking. The random number generator creates integers within any custom range — useful for games, sampling, or decision making.
All tools are completely free, private, and accurate. Bookmark this page for quick access to all your maths and conversion needs.
Calculate percentage of a number, increase/decrease, and find what percent.
Convert length, weight, volume, temperature between metric and imperial.
Simplify fractions and perform add, subtract, multiply, divide operations.
Convert between major world currencies with live exchange rates.
Calculate Body Mass Index with metric or imperial units.
Basic arithmetic, square root, powers, sin, cos, tan, log.
Calculate area, perimeter, and volume for common shapes.
Calculate hours and minutes between two times.
Calculate sale price, savings, and final price including tax.
Generate random integers within a custom range.