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Mathematics

Essential math tools

All tools in this category (23)

Percentage Calculator

Free percentage calculator to find a percent of a number, calculate percentage change and see what percent one value is of another. Useful for finance, school, discounts, statistics and everyday calculations.

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Discount Calculator

Calculate sale price, discount amount, savings and final price with optional tax. Perfect for shopping, promotions, ecommerce pricing and comparing deals.

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Average Calculator

Free average calculator. Compute the mean, sum, min, max, range and standard deviation of up to 8 numbers instantly.

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Power & Roots Calculator

Free power and roots calculator. Compute base^exponent, square root, cube root, log base 10 and natural logarithm in one tool.

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Triangle Calculator

Calculate area, perimeter, hypotenuse and angles for right triangles (Pythagorean theorem) or any triangle using base & height or 3 sides (Heron's formula).

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BMI Calculator

Calculate your Body Mass Index (BMI) from your height and weight. Get your BMI score, weight category and estimated healthy weight range instantly.

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Tip Calculator

Calculate tip amount, total bill and split per person instantly. Useful for restaurants, cafes, travel and group meals when you want to add gratuity and divide the bill fairly.

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GCD & LCM Calculator

Calculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of 2 or 3 integers instantly. Useful for simplifying fractions, number theory exercises and common denominator problems.

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Quadratic Equation Calculator

Solve any quadratic equation ax² + bx + c = 0. Get discriminant, real or complex roots, and vertex coordinates instantly.

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Circle Calculator

Calculate all circle properties from any known value: radius, diameter, circumference, or area. Instant results with full precision.

Fraction Calculator

Add, subtract, multiply or divide two fractions instantly. Get the simplified result, unsimplified form, decimal value and full expression in one place.

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Speed, Distance & Time Calculator

Calculate speed, distance or time using the classic formula. Enter any two values to find the third. Also shows pace per km for runners.

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Proportion Calculator (Rule of Three)

Solve proportions A/B = C/D. Enter three values to find the fourth using the rule of three. Perfect for scaling, recipes, maps, and unit conversions.

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Prime Factorization Calculator

Decompose any integer into its prime factors instantly. Shows prime/composite status, full factorization with exponents, and sum of divisors.

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Number Base Converter

Convert a decimal integer instantly to binary, octal, hexadecimal and base 32. Useful for programming, computer science, electronics and learning number systems.

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Inverse Percentage Calculator

Find the original value before a percentage increase or decrease. Perfect for discounts, VAT back-calculation, sale prices, price recovery and reverse percentage problems.

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Ratio Calculator

Simplify ratios and find equivalent ratios instantly. Useful for math, recipes, maps, proportions and school exercises.

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Area Calculator

Calculate rectangle area and perimeter instantly from length and width. Useful for flooring, paint, construction, school and DIY projects.

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Density Calculator

Calculate density instantly from mass and volume. Useful for physics, chemistry, school exercises and engineering.

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Volume Calculator

Calculate volume and surface area of a box or rectangular prism instantly from length, width and height.

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Triangle Area Calculator

Calculate triangle area instantly from base and height. Simple online tool for geometry, school and practical measurements.

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Rule of Three Calculator

Solve proportions instantly with this rule of three calculator. Useful for prices, quantities, recipes, ratios and school math.

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Percentage Difference Calculator

Calculate absolute difference and percent difference between two values instantly. Useful for science, statistics, prices and comparisons.

Free math calculators: percentage, average, GCD, LCM, powers and more. Simple and instant results.

Math calculators for percentages, ratios and formulas

The math category includes everyday tools for percentages, averages, ratios, geometry, fractions, number bases and other common calculations.

These pages are designed for students, professionals and anyone who needs a fast answer without opening a spreadsheet or writing a formula by hand.

Full calculator list

Math calculator FAQ

What kinds of math calculators are included?

You will find tools for percentages, discounts, proportions, geometry, fractions, powers, GCD/LCM and more.

Are these calculators useful outside school?

Yes. Many of them are practical for budgeting, shopping, business comparisons, measurements and everyday problem solving.