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All Free Calculators

231 free calculators — updated regularly. No sign-up, no ads.

BMI Calculator
Calculate your Body Mass Index (BMI) to check if you have a healthy weight for your…
Health & Fitness
Probability Calculator
Calculate basic probability, combinations, permutations, and compound event probability.
Math Calculators
Algebra Calculator
Evaluate algebraic expressions, solve linear equations, and compute polynomial values.
Math Calculators
Area Calculator
Calculate the area of any 2D shape: circle, rectangle, triangle, trapezoid, ellipse, and more.
Math Calculators
Triangle Calculator
Solve any triangle using sides and angles. Calculate area, perimeter, and all missing values.
Math Calculators
LCM and GCF Calculator
Calculate the Least Common Multiple (LCM) and Greatest Common Factor (GCF/GCD) of two or more numbers.
Math Calculators
Prime Number Calculator
Check if a number is prime, find prime factors, and generate lists of prime numbers.
Math Calculators
Number System Converter
Convert numbers between binary, octal, decimal, and hexadecimal number systems instantly.
Math Calculators
Ratio Calculator
Simplify ratios, find equivalent ratios, and solve ratio proportion problems.
Math Calculators
Statistics Calculator
Calculate comprehensive statistics: mean, median, mode, quartiles, IQR, variance, and more.
Math Calculators
Quadratic Equation Solver
Solve any quadratic equation ax² + bx + c = 0 and find real or complex…
Math Calculators
Logarithm Calculator
Calculate logarithms in any base including log base 10, natural log (ln), and custom bases.
Math Calculators