Maths & Conversion Calculators

Calculate percentages easily — find what percent of a number is, percentage change, and more.

Add, subtract, multiply, and divide fractions. Simplifies results to the lowest terms automatically.

Calculate the area of common shapes — rectangle, circle, triangle, trapezium, and more.

Calculate the mean, median, mode, and range from any set of numbers. Enter your data and get all four measures of central tendency instantly.

Solve proportions and find the missing value in A:B = C:D. Simplify ratios, scale recipes, convert map distances, and work with any proportional relationship.

Solve any quadratic equation ax² + bx + c = 0. Get both roots, the discriminant, vertex coordinates, and axis of symmetry with full working shown.

Calculate any power or root. Enter a base and exponent to compute bⁿ, including negative exponents, fractional exponents (roots), and zero power.

Find the Least Common Multiple (LCM) and Highest Common Factor (HCF/GCD) of two or more numbers. Uses prime factorisation and the Euclidean algorithm with step-by-step working.

Convert between Roman numerals and standard (Arabic) numbers. Enter a Roman numeral like XIV or a number like 2024 and get the conversion instantly with the breakdown explained.

Convert between standard notation and scientific notation. Enter any number and get it expressed as a × 10ⁿ, or enter scientific notation to see the full number.

Check if a number is prime, find its complete prime factorisation, and list all prime numbers up to a given limit. Uses trial division and the Sieve of Eratosthenes.