Free Math Calculators
Percentages, exponents, roots, geometry, statistics, and algebra — free math calculators and solvers.
Percent Error Calculator
Compare a measured value to the true value.
Exponent Calculator
Raise any base to any power.
Root Calculator
Find the square, cube, or any nth root.
Log Calculator
Compute a logarithm of any base.
Half-Life Calculator
Calculate remaining quantity after decay.
Pythagorean Theorem Calculator
Find the hypotenuse of a right triangle.
Right Triangle Calculator
Solve a right triangle from its two legs.
Slope Calculator
Find the slope between two points.
Distance Calculator
Find the distance between two points.
Circle Calculator
Find a circle's area, circumference, and diameter.
Area Calculator
Calculate the area of common shapes.
Volume Calculator
Calculate the volume of 3D shapes.
Surface Area Calculator
Calculate the surface area of 3D shapes.
Z-Score Calculator
Find how many standard deviations from the mean.
Confidence Interval Calculator
Find a confidence interval for a mean.
Sample Size Calculator
Find the survey sample size you need.
Probability Calculator
Combine the probabilities of two events.
Permutation and Combination Calculator
Compute permutations (nPr) and combinations (nCr).
Quadratic Formula Calculator
Solve any quadratic equation.
Scientific Notation Calculator
Convert a number to scientific notation.
Rounding Calculator
Round a number to any number of places.
GCF Calculator
Find the greatest common factor.
LCM Calculator
Find the least common multiple.
Factor Calculator
List all factors and prime factorization.
Number Sequence Calculator
Find the nth term and sum of a sequence.
Standard Deviation Calculator
Find the standard deviation of a data set.
Statistics Calculator
Get full summary statistics for a data set.
Mean, Median, Mode, Range Calculator
Find the mean, median, mode, and range.
Triangle Calculator
Solve a triangle from its three sides.
Matrix Calculator
Find the determinant of a 2×2 or 3×3 matrix.
Binary Calculator
Do arithmetic in binary and convert to decimal.
Hex Calculator
Do arithmetic in hexadecimal.
Big Number Calculator
Exact arithmetic on very large integers.
Basic Calculator
A simple online calculator.
Long Division Calculator
Divide with a step-by-step worked solution.
Prime Factorization Calculator
Break a number into its prime factors.
P-value Calculator
Find the p-value from a test statistic.
About these math calculators
Free math calculators for algebra, geometry, and statistics — percent error, exponents and roots, logarithms, the quadratic formula, GCF and LCM, factors and prime factorization, number sequences, permutations and combinations, area, volume and surface area, circle, distance, slope, the Pythagorean theorem and right triangles, plus z-score, confidence intervals, sample size, and probability. Each shows the answer instantly with the formula behind it — no sign-up, all in your browser.
Frequently asked questions
Are these math calculators free?
Yes — every calculator is free, runs in your browser, and needs no account. Each shows the formula so you can check the work.
Do they show the steps?
They show the result and the key formula (and the discriminant, prime factorization, and so on where relevant), so you understand how the answer is derived.
Can I use them for homework?
Absolutely — they're built for students and anyone who needs a quick, accurate answer to a common math problem.