Arithmetic, Algebra & Geometry Calculators
Solve everyday and school math fast. Work with percentages, fractions, exponents and roots, quadratic equations, geometry (area, volume, triangles, circles), and grades and GPA.
28 free calculators · no sign-up · instant results
Arithmetic
LCM & GCD Calculator
Least common multiple and greatest common divisor
Percentage Calculator
Percent of, percent change, and what percent
Average Calculator
Mean, median, mode, and standard deviation
Fraction Calculator
Add, subtract, multiply, and divide fractions
Ratio Calculator
Simplify ratios or solve proportions
Exponent Calculator
Any base raised to any power
Square Root Calculator
Square roots, cube roots, squares, and cubes
Logarithm Calculator
Log base 10, natural log, or any custom base
Factorial Calculator
Calculate n! with multiplication steps
Rounding Calculator
Round to decimal places with floor, ceil, or truncate
Modulo Calculator
Remainder after division — a mod b
Percentage Error Calculator
Percent error between experimental and theoretical values
Basic Calculator
Fast online calculator for add, subtract, multiply, divide
Scientific Calculator
Trig, logs, exponents, roots & constants with full order of operations
Algebra
Geometry
Area Calculator
Area of squares, rectangles, circles, triangles
Volume Calculator
Volume of 3D shapes — cubes, spheres, cylinders
Triangle Calculator
Area, sides, and angles via Pythagorean theorem
Circle Calculator
Area, circumference, diameter, and radius from any input
Law of Cosines Calculator
Solve any triangle from SSS or SAS
Angle Converter
Convert between degrees, radians, gradians, and arc minutes
Pythagorean Theorem Calculator
Solve a² + b² = c² for any right-triangle side
Square Footage Calculator
Area from length × width, plus material cost
Grades & GPA
Frequently asked questions
Do these calculators show the steps?
Many, including the Quadratic, Fraction, and Percentage calculators, show the breakdown so you can follow and learn the method, not just the answer.
Which calculator handles geometry?
Use the Area, Volume, Circle, and Triangle calculators for shapes, and the Pythagorean Theorem and Law of Cosines calculators for triangle sides and angles.