Math Calculators — Every Formula & Tool You Need

From basic arithmetic to advanced statistics, our math calculators cover every topic you'll encounter in school or work. Each calculator shows its formula and working steps so you learn, not just compute.

本指南中包含 414+ 个计算器

Fractions

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Add, subtract, multiply, divide and convert fractions. Step-by-step solution with formula, LCD method and fully worked examples. Instant result.

Add Fractions

Add two or more fractions and get the simplified result. Enter numerators and denominators

Mixed Numbers Calculator

Perform operations on mixed numbers: add, subtract, multiply, or divide. Enter mixed numbe

Simplify Fractions

Reduce any fraction to its lowest terms. Enter numerator and denominator — get the simplif

Complex Fractions

Simplify complex and compound fractions with numerators or denominators that are themselve

Decimal to Fraction

Convert any decimal to a fraction in lowest terms. Enter your decimal — get the exact frac

Fraction to Decimal

Convert any fraction to its decimal equivalent. Enter numerator and denominator — get the

Fraction to Percent

Convert any fraction to a percentage. Enter the numerator and denominator — get the percen

Percent to Fraction

Convert any percentage to a fraction in simplest form. Enter your percentage — get the fra

LCD Calculator

Find the Lowest Common Denominator for any set of fractions. Enter your denominators and g

LCM Calculator

Calculate the Least Common Multiple of two or more integers. Enter your numbers and get th

GCF Calculator

Find the Greatest Common Factor of any set of numbers. Enter your integers and get the GCF

Equivalent Fractions

Find equivalent fractions for any fraction. Enter numerator and denominator — get a full l

General Math

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Core arithmetic and number operations — addition, subtraction, rounding, factors, primes, and sequences. Enter your values and get instant step-by-step answers. Free.

Basic Calculator

Standard arithmetic operations. Enter your values — see the result with formula, examples,

Percentage Calculator

Calculate percentages, increases and decreases. Quick calculation with worked example and

Rounding Calculator

Round numbers to any decimal place. Enter your value and unit — see the converted result w

Long Division Calculator

Step-by-step long division with remainders. Enter your values — see the result with formul

Long Multiplication

Multiply any two large numbers step by step with long multiplication. Enter your values —

Prime Factorization

Break numbers into prime factors. Enter your value and unit — see the converted result wit

Prime Number Checker

Is your number prime? Enter any integer and instantly find out — with full divisibility pr

Binary Converter

Convert between binary, decimal, hex and octal. Fast and accurate conversion with formula,

Log Calculator

Calculate logarithms in any base (common, natural, or custom). Enter your value and base —

Exponent Calculator

Calculate any base raised to any power, including fractional and negative exponents. Enter

Matrix Calculator

2×2 matrix addition, multiplication, determinant and transpose. See formula, step-by-step

Factors Calculator

List all factors and factor pairs of any positive integer. Enter your number — see every d

Algebra

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Solve equations, factor polynomials, and work with exponents and roots. Enter your expression — get step-by-step algebraic working and the complete solution. Free.

Quadratic Formula

Solve any quadratic equation ax²+bx+c=0. Enter coefficients — get all roots via quadratic

Exponents Calculator

Calculate powers and exponents. See formula, step-by-step solution and all rearrangements.

Square Root Calculator

Find square roots of any number. Formula, variable legend, diagram and worked example incl

Cube Root Calculator

Calculate Cube Root quickly and accurately. Enter your values — see the result with the fo

Radicals & Roots

Simplify and calculate radical expressions. Enter your radicand and index — see the simpli

Logarithm Calculator

Solve logarithm equations. See formula, step-by-step solution and all rearrangements. Inst

Absolute Value Calculator

Calculate Absolute Value quickly and accurately. Enter your values — see the result with t

FOIL Method Calculator

Multiply two binomials using the FOIL method. Enter (a+b)(c+d) — see each product (First,

Percent Change Calculator

Calculate percentage change between values. Quick calculation with worked example and form

Percent Difference

Find percentage difference between two values. Quick calculation with worked example and f

Percent Error Calculator

Calculate percent error between a measured and theoretical value. Enter both values — see

Completing the Square

Solve quadratics by completing the square. Formula, variable legend, diagram and worked ex

Percent

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Percentage calculations and conversions. Quick calculation with worked example and formula. Free everyday calculator.

Percentage Increase

Calculate percentage increase between two values. Enter the original and new value — see p

Percentage Decrease

Calculate percentage decrease between two values. Enter the original and new value — see p

Percent to Decimal

Convert any percentage to a decimal by dividing by 100. Enter percentage — get the decimal

Decimal to Percent

Convert any decimal to a percentage by multiplying by 100. Enter decimal — get the percent

Tip Calculator

Calculate the tip amount for any restaurant bill. Enter the total and tip % — see tip per

Discount Calculator

Calculate Discount quickly and accurately. Enter your values — see the result with the for

Percentage Error Calculator

Calculate Percentage Error quickly and accurately. Enter your values — see the result with

Percentage Off Calculator

Calculate Percentage Off quickly and accurately. Enter your values — see the result with t

Reverse Percentage Calculator

Calculate Reverse Percentage quickly and accurately. Enter your values — see the result wi

Mark-Up Calculator

Calculate selling price from cost and markup percentage. Enter cost and markup — see selli

Tax and Tip Combined Calculator

Calculate Tax and Tip Combined quickly and accurately. Enter your values — see the result

Statistics

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Mean, median, mode, standard deviation, distributions, and hypothesis tests. Enter your dataset — see the full statistical summary with formula and interpretation. Free.

Mean Median Mode

Calculate mean, median, and mode of any dataset. Enter values — see all three averages, so

Standard Deviation

Calculate variance and standard deviation. Step-by-step solution with formula, example dat

Confidence Interval Calculator

Calculate confidence intervals for population means. Step-by-step solution with formula, e

Test Grade Calculator

Convert correct answers to percentage and letter grade. Fast and accurate result with form

Average Calculator

Find the arithmetic mean of any set of numbers. Enter your values — see the mean, sum, cou

Quartile Calculator

Calculate quartiles and IQR. Step-by-step solution with formula, example dataset and inter

Percentile Calculator

Find percentile rank of data values. Step-by-step solution with formula, example dataset a

Variance Calculator

Calculate statistical variance. Step-by-step solution with formula, example dataset and in

Z-Score Calculator

Calculate z-score from any value, mean, and standard deviation. Enter your data — see z-sc

Descriptive Statistics

Complete statistical summary of any dataset. Enter your values — see mean, median, mode, v

Sum Calculator

Add a list of numbers quickly and accurately. Enter your values separated by commas — see

Random Number Generator

Generate random numbers in any range with or without repetition. Enter min, max, and count

Hypothesis Testing

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P-Value Calculator

P-value from test statistic for z t and chi-square tests. Step-by-step solution with formu

Effect Size Calculator

Calculate required sample size for desired statistical power. Enter effect size, alpha, an

Statistical Power Calculator

Calculate required sample size for any hypothesis test. Enter effect size, alpha, and desi

Confidence Level Calculator

Confidence interval for population parameters. Step-by-step solution with formula, example

Paired t-Test Calculator

Compare means of related or paired measurements. Step-by-step solution with formula, examp

Chi-Square Test Calculator

Test independence of categorical variables. Step-by-step solution with formula, example da

F-Distribution Calculator

Find F critical values and p-values for ANOVA tests. Enter degrees of freedom and alpha —

Moving Average Calculator

Calculate Moving Average quickly and accurately. Enter your values — see the result with t

Geometric Mean Calculator

Calculate the geometric mean of any dataset. Enter your values — see the nth root formula,

Harmonic Mean Calculator

Calculate the harmonic mean of any set of values. Enter your numbers — see the formula, re

Interquartile Range Calculator

Calculate the IQR and five-number summary. Enter your dataset — see Q1, Q2, Q3, IQR, and i

Percentile Rank Calculator

Find the percentile rank of a score in any dataset. Enter your scores — see the percentile

Data Analysis

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Covariance Calculator

Calculate the covariance between two datasets. Enter paired x and y values — see populatio

Moving Average Calculator

Calculate simple, exponential, and weighted moving averages. Enter your data series and pe

Box Plot Calculator

Generate the five-number summary for any dataset. Enter your values — see min, Q1, median,

Histogram Calculator

Create frequency distribution and histogram data from any dataset. Enter your values and b

Discrete Math

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Combinations, permutations, sequences, logic, and graph theory tools. Enter your parameters — see the result with combinatorial formula and worked steps. Free.

Combinations (nCr)

Calculate combinations without replacement. Step-by-step solution with formula, example da

Permutations (nPr)

Calculate permutations without replacement. Step-by-step solution with formula, example da

Factorial Calculator n!

Calculate factorials of integers. See formula, step-by-step solution and all rearrangement

Pascal's Triangle

Generate Pascal's Triangle for any number of rows. Enter n — see the full triangle with bi

Fibonacci Calculator

Generate Fibonacci sequence numbers. See formula, step-by-step solution and all rearrangem

Combinations with Replacement

Calculate combinations with replacement C(n+r−1, r). Enter n and r — get the result with s

Permutations with Replacement

Calculate permutations with replacement (nʳ). Enter n and r — get the count with formula a

Combinations Calculator

Calculate combinations nCr for any n and r. Enter values — see the binomial coefficient, f

Inclusion-Exclusion Principle Calculator

Apply the Inclusion-Exclusion Principle to count elements in unions of sets. Enter set siz

Stirling Numbers Calculator

Calculate Stirling numbers of the first or second kind. Enter n and k — get the Stirling n

Catalan Number Calculator

Calculate the nth Catalan number. Enter n — get the Catalan number with recursive formula,

Derangements Calculator

Calculate derangements (permutations with no fixed points) for n objects. Enter n — see D(

Geometry

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Area, perimeter, volume, and surface area for any 2D or 3D shape. Enter your dimensions — see all measurements with diagrams and formula breakdown. Free.

Circle Calculator

Area, circumference, diameter and radius. Formula, variable legend, diagram and worked exa

Rectangle Calculator

Area, perimeter and diagonal of rectangles. Formula, variable legend, diagram and worked e

Square Calculator

Area, perimeter and diagonal of squares. Formula, variable legend, diagram and worked exam

Right Triangle Calculator

Solve right triangles with Pythagorean theorem. Formula, variable legend, diagram and work

Pythagorean Theorem

Apply the Pythagorean theorem to find any side of a right triangle. Enter two sides — get

Parallelogram Calculator

Calculate area and perimeter of any parallelogram. Enter base, height, and side length — s