Free Math Calculators
Solve equations, bases, GCD/LCM, and more with free math calculators. Clear formulas and examples included.
All free math calculators
18 free tools — no signup
Scientific Calculator
Scientific math with trig and logs.
GCD LCM Calculator
Compute GCD and LCM of integers.
Factorial Calculator
Calculate n! factorials quickly.
Number Base Converter
Convert binary, octal, decimal, hex.
Quadratic Equation Solver
Solve ax² + bx + c = 0 for roots.
Random Number Generator
NewGenerate random numbers in a range.
Fraction Calculator
NewDo fraction arithmetic with simplification.
Permutation & Combination Calculator
NewCompute nPr and nCr quickly.
Circle Calculator
NewCalculate circle area and circumference.
Standard Deviation Calculator
NewCalculate standard deviation and variance.
Pythagorean Calculator
NewFind missing sides of a right triangle.
Aspect Ratio Calculator
NewCalculate and scale aspect ratios.
Triangle Area Calculator
NewFind triangle area from sides or base/height.
Average Calculator
NewFind the average (mean) of numbers.
DPI Calculator
NewCompute DPI/PPI for print sizing.
Ratio Calculator
NewSimplify and solve ratios and proportions.
Z-Score Calculator
NewCalculate standard scores (z-scores).
Median Calculator
NewCalculate the median of a number list.
FAQ
Are these math calculators really free?
Yes. Every tool in this category is free to use with no account and no paywall. Processing runs in your browser whenever the tool supports client-side workflows.
Does the factorial calculator handle large numbers?
Yes. It uses BigInt for exact factorials up to a practical limit.