Math Calculators
Solve arithmetic, algebra, geometry, statistics, probability, percentages, and number problems with focused mathematical tools. Each calculator names its required values, applies a visible equation, and returns a reproducible result. Related links help you move between nearby concepts without treating measurement, science, or conversion tools as the same subject.
What can you calculate here?
Choose a focused tool below for a transparent, shareable result backed by the method and sources shown on its page.
Percentage Calculator
Calculate a percentage of a number, find what percentage one value is of another, or measure percentage change with exact decimal arithmetic.
Scientific Calculator
Evaluate sine, cosine, tangent, logarithms, square roots and powers with decimal-safe inputs, degree or radian angles, and cited formulas.
Sales Tax Calculator
Calculate sales tax, discounted subtotal, and final purchase total from price, quantity, discount, and an entered tax rate.
Discount Calculator
Find the savings, discounted sale price, and optional after-tax total from an original price and percentage discount.
Tip Calculator
Calculate a tip, total bill, and equal per-person share from the bill amount, gratuity rate, group size, and clear rounding assumptions.
Standard Deviation Calculator
Standard Deviation Calculator returns sample variability from four observations around their arithmetic mean.
Statistics Calculator
Statistics Calculator returns the arithmetic mean from four entered sample values for comparison.
Probability Calculator
Probability Calculator returns a percentage from favorable outcomes and total possible outcomes.
Confidence Interval Calculator
Confidence Interval Calculator returns bounds from mean, standard deviation, sample size, and z-score.
Triangle Calculator
Triangle Calculator returns area from entered base and perpendicular height measurements in matching units.
Right Triangle Calculator
Right Triangle Calculator returns hypotenuse length from two perpendicular sides using the Pythagorean theorem.
Volume Calculator
Volume Calculator returns rectangular volume from entered length, width, and height measurements.
Surface Area Calculator
Surface Area Calculator returns rectangular-prism surface area from three entered dimension measurements.
Fraction Calculator
Fraction Calculator returns the exact sum of two fractions from their entered numerators and denominators.
Quadratic Formula Calculator
Quadratic Formula Calculator returns a solution from the entered a, b, and c coefficients.
Matrix Calculator
Matrix Calculator returns the determinant of a two-by-two matrix from its four entered elements.
Sample Size Calculator
Sample Size Calculator estimates observations needed from confidence, expected proportion, and margin of error.
Z-Score Calculator
Z-Score Calculator computes the standard score for an observed value from value, mean, and standard deviation.
P-Value Calculator
P-Value Calculator returns a two-tailed p-value from an entered z-score under a standard normal distribution.
Permutation and Combination Calculator
Permutation and Combination Calculator returns ordered arrangements from entered object and selection counts.
Mean, Median, Mode and Range Calculator
Mean, Median, Mode and Range Calculator summarizes five values with central and spread measures.
Average Calculator
Average Calculator returns the arithmetic mean of five entered values for a quick central estimate.
Variance Calculator
Variance Calculator returns sample variance from five entered observations around their arithmetic mean.
Ratio Calculator
Ratio Calculator returns a quotient and simplified relationship from two entered comparison values.
Exponent Calculator
Exponent Calculator returns the power result from an entered numerical base and integer exponent.
Root Calculator
Root Calculator determines the selected mathematical root from value and degree using the displayed formula.
Log Calculator
Log Calculator returns a logarithm from the entered value and selected numerical base.
Scientific Notation Calculator
Scientific Notation Calculator returns a number from its entered coefficient and power of ten.
Big Number Calculator
Big Number Calculator returns the exact sum of two large integers without floating-point rounding.
Long Division Calculator
Long Division Calculator returns quotient and remainder from an entered dividend and nonzero divisor.
LCM Calculator
LCM Calculator returns the least common multiple shared by two entered positive integers.
GCF Calculator
GCF Calculator finds the largest integer that evenly divides both entered whole numbers.
Factor Calculator
Factor Calculator lists every positive divisor of an entered whole number in ascending order.
Prime Factorization Calculator
Prime Factorization Calculator computes the prime factors of an integer from n.
Area Calculator
Area Calculator returns rectangular area from entered length and width measurements in matching units.
Circle Calculator
Circle Calculator returns circular area from the entered radius using the displayed equation.
Distance Calculator
Distance Calculator returns straight-line distance between two points from their entered coordinate pairs.
Pythagorean Theorem Calculator
Pythagorean Theorem Calculator returns a hypotenuse from the two entered right-triangle legs.
Slope Calculator
Slope Calculator returns vertical change per horizontal change from two coordinate pairs.
Percent Error Calculator
Percent Error Calculator compares an observed value with its accepted reference value.
Percent Off Calculator
Percent Off Calculator returns the sale price from original price and discount rate.
Rounding Calculator
Rounding Calculator returns a rounded number from an entered value and chosen decimal places.
Number Sequence Calculator
Number Sequence Calculator returns an arithmetic-sequence term from first value, common difference, and position.
Basic Calculator
Basic Calculator derives the sum of two numbers from a and b.
Proportion Calculator
Proportion Calculator returns the missing proportional value from three entered terms in equivalent ratios.
Graphing Calculator
Graphing Calculator returns a y-coordinate from entered slope, intercept, and x-coordinate values.