Math Calculators
Algebra, geometry, and number calculators
Percentage Calculator
Calculate what percentage one number is of another.
Quadratic Equation Solver
Solve quadratic equations of the form ax² + bx + c = 0.
Pythagorean Theorem
Calculate the hypotenuse of a right triangle.
Circle Calculator
Calculate circumference and area of a circle.
Triangle Area Calculator
Calculate the area of a triangle.
Length Unit Converter
Convert between different length units.
Average Calculator
Calculate the average of multiple numbers (sum/count).
Fraction to Decimal
Convert a fraction to its decimal equivalent.
Exponent Calculator
Calculate the power of a number (base^exponent).
GCD & LCM Calculator
Calculate Greatest Common Divisor and Least Common Multiple.
Test Grade Calculator
Calculate test percentage based on correct and total questions.
Circumference Calculator
Calculate the circumference of a circle from radius.
90 Day Calculator
Add 90 days to a starting day number.
30 Day Calculator
Add 30 days to a starting day number.
Age Calculator
Work out your exact age in years, months, and total days from your birth year.
GPA Calculator
Calculate your grade point average from your grade points and credit hours.
kg to lbs Converter
Convert kilograms to pounds instantly, with the reverse conversion shown alongside.
cm to Inches Converter
Convert centimetres to inches — plus feet-and-inches for heights.
Celsius to Fahrenheit Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin.
Miles to Kilometres Converter
Convert miles to kilometres — perfect for road trips, running and pace.
Feet to Metres Converter
Convert feet to metres for anything from ceiling heights to cliff dives.