Math & Education
Free math calculators: percentages, averages, fractions, equations, and educational tools.
Percentage Calculator
Calculate percentages, increases, discounts, and proportions.
Rule of Three Calculator
Solve direct and inverse rule of three (cross-multiplication) problems.
Average/Mean Calculator
Calculate the mean, median, and mode of a set of numbers.
Final Grade Calculator
Calculate your weighted final grade and the minimum score needed to pass.
Fraction Calculator
Add, subtract, multiply, and divide fractions step by step.
Unit Converter
Convert between units of length, weight, volume, and temperature.
Area & Perimeter Calculator
Calculate the area and perimeter of common geometric shapes.
GCD & LCM Calculator
Calculate the Greatest Common Divisor and Least Common Multiple.
Roman Numeral Converter
Convert between Arabic numbers and Roman numerals.
Equation Solver
Solve linear and quadratic equations with step-by-step solutions.
Square Root Calculator
Calculate square roots, cube roots, and nth roots of any number.
Exponent/Power Calculator
Calculate powers and exponents of any number.
Logarithm Calculator
Calculate logarithms in base 10, natural log (ln), and any custom base.
Multiplication Table Generator
Generate multiplication tables from 1 to 100 for studying.
Standard Deviation Calculator
Calculate standard deviation, variance, and other statistics for a data set.
Combinations & Permutations Calculator
Calculate combinations (nCr) and permutations (nPr) with factorials.
Scientific Notation Converter
Convert numbers to and from scientific notation (E notation).
Matrix Calculator
Perform matrix operations: addition, multiplication, determinant, and inverse.