Percentage Calculator
Find percentages, percentage change, or reverse-calculate original values.
Fraction Calculator
Add, subtract, multiply or divide two fractions. Automatically simplifies the result.
Average & Statistics Calculator
Calculate mean, median, standard deviation, sum, min, max from a list of numbers.
GCD & LCM Calculator
Find the Greatest Common Divisor and Least Common Multiple of two or more integers.
Prime Number Checker
Check if a number is prime and find its prime factors.
Factorial Calculator
Calculate the factorial (n!) of any non-negative integer up to 170.
Fibonacci Sequence Generator
Generate the first N numbers in the Fibonacci sequence (up to 78).
Square Root & nth Root Calculator
Find the square root, cube root, or any nth root of a number.
Quadratic Equation Solver
Solve ax² + bx + c = 0 for all real and complex roots using the quadratic formula.
Enter coefficients for: ax² + bx + c = 0
Ratio Calculator
Simplify ratios, find the decimal equivalent, and calculate proportions.
Triangle Calculator
Calculate triangle area by base & height, by three sides (Heron's formula), or find hypotenuse.
Circle Calculator
Find radius, diameter, circumference, and area from any one measurement.
Pythagorean Theorem Calculator
Find the missing side of a right triangle using a² + b² = c².
Rectangle & Square Calculator
Calculate area, perimeter, and diagonal of a rectangle or square.
Number Base Converter
Convert numbers between binary (2), octal (8), decimal (10), and hexadecimal (16) bases.