Math calculators for fast, clear problem solving
Browse calculators for arithmetic, percentages, fractions, ratios, algebra, exponents, roots, logarithms, geometry, statistics, probability, sequences, matrices, and number theory. Each page includes a calculator, formula, example, how-to guidance, FAQs, and structured data.
Search by calculator name, topic, formula, or problem type.
Arithmetic
8 calculators
Basic Calculator
Perform addition, subtraction, multiplication, and division with instant results.
Open calculatorAddition Calculator
Add two numbers and review the arithmetic result.
Open calculatorSubtraction Calculator
Subtract one number from another with a clear result display.
Open calculatorMultiplication Calculator
Multiply two values and see the product instantly.
Open calculatorDivision Calculator
Divide numbers and review quotient, remainder-style context, and decimal result.
Open calculatorLong Division Calculator
Calculate division results and understand quotient relationships.
Open calculatorRemainder Calculator
Find quotient and remainder for integer-style division.
Open calculatorModulo Calculator
Calculate modulo remainder for number theory and programming math.
Open calculatorPercentages
4 calculators
Percentage Calculator
Calculate percentages, increases, decreases, and percent values.
Open calculatorPercent Change Calculator
Calculate percent increase or decrease between two values.
Open calculatorPercent Error Calculator
Estimate percent error from expected and observed values.
Open calculatorDiscount Calculator
Calculate a percentage discount and final amount.
Open calculatorFractions
5 calculators
Fraction Calculator
Add, subtract, multiply, divide, simplify, and convert fractions.
Open calculatorSimplify Fraction Calculator
Reduce a fraction to lowest terms using the greatest common divisor.
Open calculatorMixed Number Calculator
Convert between improper fractions, mixed numbers, and decimals.
Open calculatorDecimal to Fraction Calculator
Convert a decimal value into a simplified fraction.
Open calculatorFraction to Decimal Calculator
Convert numerator and denominator into a decimal result.
Open calculatorRatios
4 calculators
Ratio Calculator
Simplify ratios and scale proportional values.
Open calculatorProportion Calculator
Solve proportional relationships and missing values.
Open calculatorUnit Rate Calculator
Calculate rate per unit for price, speed, density, or productivity.
Open calculatorRule of Three Calculator
Solve direct proportion problems using the rule of three.
Open calculatorStatistics
6 calculators
Average Calculator
Calculate mean, total, count, and range from a set of values.
Open calculatorMean Calculator
Find the arithmetic mean of a group of numbers.
Open calculatorMedian Calculator
Estimate median-style midpoint context from summary values.
Open calculatorMode Calculator
Review repeated-value style summary context for a number set.
Open calculatorRange Calculator
Calculate the spread between minimum and maximum values.
Open calculatorStandard Deviation Calculator
Estimate spread and variability from a group of values.
Open calculatorProbability
5 calculators
Probability Calculator
Calculate probability from favorable and total outcomes.
Open calculatorOdds Calculator
Convert probability into odds and complement probability.
Open calculatorPermutation Calculator
Calculate ordered arrangements from n items taken r at a time.
Open calculatorCombination Calculator
Calculate unordered selections from n items taken r at a time.
Open calculatorFactorial Calculator
Calculate factorial values used in counting problems.
Open calculatorAlgebra
8 calculators
Algebra Calculator
Solve common algebra expressions and isolate unknown values.
Open calculatorLinear Equation Calculator
Solve equations in the form ax plus b equals c.
Open calculatorQuadratic Formula Calculator
Solve quadratic equations using the quadratic formula.
Open calculatorQuadratic Equation Calculator
Find real roots, discriminant, and vertex context for quadratic equations.
Open calculatorSystem of Equations Calculator
Solve a two-variable linear system using determinant math.
Open calculatorSlope Calculator
Calculate slope and line-change relationships from values.
Open calculatorIntercept Calculator
Estimate intercept-style linear equation results.
Open calculatorInequality Calculator
Solve simple one-variable inequality-style expressions.
Open calculatorPowers and roots
9 calculators
Exponent Calculator
Calculate powers from a base and exponent.
Open calculatorSquare Calculator
Square a number and review the power result.
Open calculatorCube Calculator
Cube a number and review repeated multiplication.
Open calculatorPower Calculator
Evaluate a base raised to an exponent with power details.
Open calculatorSquare Root Calculator
Calculate square root and related power values.
Open calculatorCube Root Calculator
Calculate cube root and nth-root relationships.
Open calculatorNth Root Calculator
Calculate any positive nth root of a value.
Open calculatorLog Calculator
Calculate logarithms using any positive base.
Open calculatorNatural Log Calculator
Calculate natural logarithm values and exponential context.
Open calculatorGeometry
14 calculators
Triangle Calculator
Calculate triangle area, perimeter, and right-triangle relationships.
Open calculatorRight Triangle Calculator
Calculate hypotenuse, area, and perimeter for right triangles.
Open calculatorPythagorean Theorem Calculator
Find a right triangle side using the Pythagorean theorem.
Open calculatorCircle Calculator
Calculate circle area, circumference, radius, and diameter relationships.
Open calculatorArea Calculator
Calculate area for common two-dimensional shapes.
Open calculatorPerimeter Calculator
Calculate perimeter around common shapes.
Open calculatorRectangle Calculator
Calculate rectangle area, perimeter, and diagonal.
Open calculatorSquare Area Calculator
Calculate square area and perimeter from side length.
Open calculatorPolygon Calculator
Estimate polygon area and perimeter relationships.
Open calculatorVolume Calculator
Calculate volume for common three-dimensional shapes.
Open calculatorSurface Area Calculator
Estimate surface area context from three-dimensional dimensions.
Open calculatorCylinder Volume Calculator
Calculate cylinder volume from radius and height.
Open calculatorSphere Volume Calculator
Calculate sphere volume from radius with cubic-unit context.
Open calculatorCone Volume Calculator
Calculate cone-style volume from radius, height, and one-third prism relationships.
Open calculatorSequences
3 calculators
Advanced math
2 calculators
Number theory
4 calculators
Prime Number Calculator
Test whether an integer is prime and review factor context.
Open calculatorGCF Calculator
Find greatest common factor context for integer values.
Open calculatorLCM Calculator
Find least common multiple context for integer values.
Open calculatorScientific Notation Calculator
Convert large or small values into scientific notation-style powers.
Open calculator