Math & Geometry Calculators

Percentage Calculator

Calculate percentages in three ways: what is X% of Y, X is what % of Y, and percentage change between two values. Solve three common percentage problems: find what percent X is of Y, calculate percentage change, and apply percentage markup or discount.

Fraction Calculator

Add, subtract, multiply, and divide fractions and mixed numbers. Shows step-by-step solutions and simplifies results automatically.

Standard Deviation Calculator & Variance Tool

Free standard deviation calculator to compute variance, mean, and standard deviation for population and sample data. Step-by-step statistical calculations.

Random Number Generator & Picker

Generate true random numbers instantly. Set your minimum, maximum, and quantity. Free RNG tool for lotteries, giveaways, and statistics.

Triangle Calculator | Sides, Angles, Area & Perimeter

Solve any triangle instantly. Calculate all sides, angles, area, and perimeter using SSS, SAS, ASA, AAS, or right triangle inputs. Free online triangle calculator.

Volume Calculator

Calculate the volume of common 3D shapes: sphere, cylinder, cone, cube, rectangular prism, pyramid, and ellipsoid. Calculate volume of cubes, spheres, cylinders, cones, and rectangular prisms. Perfect for construction, shipping, and math homework.

Area Calculator — Circle, Rectangle, Triangle, and More

Calculate the area and perimeter of any 2D shape instantly. Supports circles, rectangles, squares, triangles, trapezoids, ellipses, parallelograms, and sectors.

Percent Error Calculator | Find Experimental Error

Calculate percent error instantly. Compare accepted values to experimental values to find the exact margin of error in your measurements.

Exponent Calculator | Powers & Scientific Notation

Calculate powers and exponents instantly. Handle positive, negative, and fractional exponents with our free online exponent calculator.

Binary Calculator | Add, Subtract & Convert Binary

Perform binary math operations instantly. Add, subtract, multiply, and divide binary numbers with this free online binary calculator.

Hexadecimal Calculator | Hex Math & Conversion

Calculate hexadecimal math instantly. Free online hex calculator for addition, subtraction, multiplication, and hex-to-decimal conversions.

Quadratic Formula Calculator & Equation Solver

Instantly solve quadratic equations using the quadratic formula. Find real and complex roots, vertex, and discriminant step-by-step for free.

Slope Calculator

Calculate the slope, midpoint, distance, and equation of a line through two points. Also finds x and y intercepts. Calculate the slope of a line between two points. Find rise over run, slope percentage, and the angle of incline for construction projects.

Log Calculator & Logarithm Solver

Calculate logarithms with any base. Free online log calculator for natural logs (ln), common logs (base 10), and custom base logarithmic equations.

Sample Size Calculator

Determine the optimal sample size for your survey or study. Calculate how many respondents you need based on confidence level and margin of error.

Probability Calculator

Calculate the probability of single or multiple events. Free probability calculator for independent, dependent, mutually exclusive, and conditional events.

Comprehensive Statistics Calculator

Calculate mean, median, mode, range, standard deviation, and variance instantly. Free online statistics calculator for data analysis and probability.

Mean, Median, Mode Calculator

Quickly calculate the mean (average), median, and mode of any dataset. Free, accurate, and easy-to-use statistical calculator.

Permutation and Combination Calculator

Calculate permutations (nPr) and combinations (nCr) to find the number of ways to choose or arrange items. Free combinatorics calculator.

Z-Score Calculator & Standard Score Tool

Calculate Z-score, raw score, mean, and standard deviation. Free online Z-score calculator for standard normal distributions and probability.

Confidence Interval Calculator

Calculate the confidence interval for a sample mean or proportion. Supports 90%, 95%, and 99% confidence levels with step-by-step formulas.

Ratio Calculator: Simplify & Find Equivalent Ratios

Free ratio calculator to simplify ratios, solve for missing proportions, and convert ratios to fractions, decimals, and percentages instantly.

Distance Calculator

Calculate the distance between two points in 2D or 3D space using the Euclidean distance formula. Find the Euclidean distance between two coordinates in 2D space. Useful for mapping, geometry homework, and spatial data analysis.

Circle Calculator | Area, Circumference, Diameter & Radius

Calculate any circle measurement instantly. Enter one value (radius, diameter, circumference, or area) to find all others. Free online circle calculator.

Surface Area Calculator | Sphere, Cylinder, Cone & More

Calculate the surface area of any 3D shape instantly. Supports spheres, cylinders, cones, cubes, rectangular boxes, and pyramids. Free online surface area calculator.

Pythagorean Theorem Calculator

Calculate the missing side of a right triangle using the Pythagorean theorem (a² + b² = c²). Find hypotenuse or leg length.

Right Triangle Calculator

Solve a right triangle given any two values. Calculate all sides, angles, area, and perimeter of a right triangle. Solve right triangles using the Pythagorean theorem. Find unknown sides and angles when two measurements are known.

Root Calculator | Square, Cube & Nth Roots

Calculate any root of a number instantly. Free nth root calculator for square roots, cube roots, and complex fractional exponents.

LCM Calculator: Find the Least Common Multiple Instantly

Calculate the Least Common Multiple (LCM) and Greatest Common Factor (GCF) of two or more numbers. Perfect for finding common denominators.

GCF Calculator: Greatest Common Factor Finder

Calculate the Greatest Common Factor (GCF), also known as the Highest Common Factor (HCF), of two or more numbers using prime factorization and the Euclidean algorithm.

Factor Calculator: Find All Factors & Prime Factorization

Instantly find all factors, factor pairs, and the prime factorization of any number. Easily determine if a number is prime or composite with our free calculator.

Rounding Calculator: Round to Decimal Places & Sig Figs

Free rounding calculator to round any number to a specific decimal place, significant figures, or nearest integer. Supports round up, round down, and standard rounding.

Matrix Calculator | Addition, Multiplication & Determinant

Free online matrix calculator. Perform matrix addition, subtraction, multiplication, inverse, and determinant calculations instantly.

Scientific Notation Calculator & Converter

Convert standard decimal numbers to scientific notation instantly. Add, subtract, multiply, and divide in scientific notation for free.

Big Number Calculator | High Precision Math

Calculate massive numbers without scientific notation rounding. High precision big integer and decimal calculator for extreme mathematics.

Prime Factorization Calculator: Factor Tree & Primes

Free calculator to find the prime factorization of any number instantly. View the factor tree, exponential notation, and determine if a number is prime.

Long Division Calculator: Step-by-Step with Remainders

Perform long division step-by-step with remainders and decimals. View the complete division process for learning, homework, and verification.

Average Calculator

Calculate the arithmetic mean, geometric mean, and harmonic mean of a set of numbers. Supports weighted averages. Compute the arithmetic mean of any number set. Includes sum and count details. Ideal for grade calculation, data analysis, and statistics.

P-Value Calculator for Z & T Scores

Calculate the p-value from Z-scores, t-scores, chi-square, or F-statistics. Free calculator for hypothesis testing and statistical significance.

Half-Life Calculator

Calculate the amount remaining after radioactive or exponential decay using the half-life formula. Used in nuclear physics, chemistry, and pharmacology.