Math Calculators
Arithmetic and Geometric Sequence Calculator
Free sequence calculator for arithmetic and geometric sequences. Find the nth term, the sum of the first n terms, and the common difference or ratio, with steps shown.
Exponent and Logarithm Calculator
Free calculator for exponents and logarithms. Raise any base to a power, or find the logarithm of a number in any base, including common log and natural log, with steps shown.
Factorial Calculator
Calculate n! (factorial) exactly for any whole number, no matter how large. See the full digit count and scientific notation for huge results. Free.
LCM and GCF Calculator
Calculate the Least Common Multiple (LCM) and Greatest Common Factor (GCF) of two or more numbers instantly. Shows step-by-step prime factorization. Free online LCM GCF calculator.
Math Word Problem Generator
Generate random math word problems by grade level and operation. Get a printable set of story problems for homework, practice sheets, or quizzes. Free for teachers, no sign-in needed.
Matrix Calculator
Free online matrix calculator. Add, subtract, and multiply 2x2 or 3x3 matrices, plus find the determinant, transpose, and inverse with full step-by-step work shown.
Mean, Median, and Mode Calculator
Instantly find the mean, median, mode, and range of any list of numbers. Also shows sum, count, min/max, and standard deviation. Free, no signup.
Permutations and Combinations Calculator
Calculate nPr and nCr instantly, plus n! (factorial), with substituted formulas, real-world examples, and safeguards for very large n.
Polynomial Calculator
Free polynomial calculator. Add, subtract, and multiply two polynomials, or evaluate a polynomial at any value of x, with full step-by-step work shown.
Prime Factorization Calculator
Break any number down into its prime factors instantly. See the exponent form, a visual factor tree, and the full list of divisors for free.
Prime Number Checker
Instantly check whether any number is prime, see its nearest neighboring primes, and generate a list of all primes up to a limit. Free, no signup.
Quadratic Formula Calculator
Solve any quadratic equation of the form ax² + bx + c = 0. Enter the coefficients and get real or complex roots, the discriminant, vertex, and step-by-step work. Free and instant.
Ratio and Proportion Calculator
Free ratio calculator. Simplify any ratio to lowest terms, and solve proportions (a:b = c:x) for the missing value instantly, with steps shown.
Roman Numeral Converter
Convert any number from 1 to 3,999 to Roman numerals, or convert Roman numerals back to standard (Arabic) numbers. Includes a reference chart and full explanation. Free, instant, browser-based.
Scientific Notation Converter
Convert any number to scientific notation or convert scientific notation back to standard decimal form. Also multiply and divide numbers in scientific notation. Shows step-by-step work. Free, instant, browser-based.
Significant Figures Calculator
Count the significant figures in any number, or round a number to a specified number of significant figures. Shows step-by-step rules with explanations. Free, instant, browser-based sig fig calculator.
Slope Calculator
Find the slope between two points instantly, plus the slope-intercept and point-slope equations with a full step-by-step breakdown.
Standard Deviation Calculator
Calculate mean, variance, and both population and sample standard deviation from any list of numbers, with a full step-by-step breakdown shown instantly.
System of Equations Solver
Solve a system of two linear equations instantly with step-by-step elimination, exact fractions, and a built-in answer check.
More Tools
About These Math Calculators
This collection of 19+ free online math calculators covers the most common operations students and adults encounter — from basic arithmetic and fractions to percentages, conversions, and more. Every calculator runs entirely in your browser, so there is nothing to install and no data is sent to a server.
Each tool is designed to show its work, not just produce an answer. Step-by-step solutions help you understand the process, making these calculators useful for both getting an answer quickly and for learning.
What These Calculators Cover
- Fraction calculators — add, subtract, multiply, and divide fractions; convert between fractions, decimals, and mixed numbers; and simplify fractions to their lowest terms
- Percentage calculators — find what percent one number is of another, calculate percentage change, and work out tip and discount amounts
- Number tools — base conversions, prime factorization, random number generators, and other number-theory utilities
- Geometry calculators — find areas, perimeters, volumes, and distances using the Pythagorean theorem, circle formulas, and more — all with labeled diagrams and step-by-step work
- Trigonometry calculators — convert angles, evaluate all six trig functions, solve right triangles and oblique triangles with the Law of Sines and Law of Cosines, and explore the unit circle
Step-by-Step Solutions
Most calculators in this section display a complete worked solution alongside the final answer. This is especially useful when:
- You want to check your own work on a homework problem
- You need to understand why an answer is correct, not just what it is
- You are teaching a concept and need a reliable example to reference
Solutions use standard mathematical notation rendered with MathJax, so the steps look the same as they would in a textbook or on a whiteboard.
Frequently Asked Questions
- Are these calculators free to use?
- Yes, completely free with no account or sign-up required.
- Do they work on phones and tablets?
- Yes. Every calculator is designed for both desktop and mobile browsers.
- Is my data stored anywhere?
- No. All calculations happen locally in your browser. Nothing you enter is transmitted anywhere.
- How accurate are the results?
- Fraction calculations use exact integer arithmetic wherever possible, so there is no floating-point rounding error in the result itself. Decimal conversions use JavaScript's 64-bit floating-point math, which is accurate to about 15 significant digits — more than sufficient for everyday use.