Math Calculators
Every math calculator on the site, in one place - arithmetic, algebra, geometry, and statistics tools, grouped by what you're actually trying to solve.
Each tool shows its formula directly on the page, worked through with a real example, so you can follow the method - not just copy an answer. Everything runs in your browser and nothing you enter is saved. Jump to a section, or scroll through all 23.
Arithmetic & numbers
The building blocks - percentages, fractions, and number properties.
- Percentage Calculator - find a percentage of a number, what percent one number is of another, or percentage change.
- Fraction Calculator - add, subtract, multiply, or divide fractions, automatically simplified.
- Ratio Calculator - simplify a ratio, or solve for a missing value in an equivalent ratio.
- GCF and LCM Calculator - the greatest common factor and least common multiple of two or more numbers.
- Square Root Calculator - the square root or any nth root of a number.
- Exponent Calculator - a base raised to any power, including negative and fractional exponents.
- Log Calculator - the logarithm of any number, with any base.
- Significant Figures Calculator - count or round to a specific number of significant figures.
- Scientific Notation Calculator - convert between standard decimal and scientific notation.
Algebra
Solving equations and working with lines.
- Quadratic Formula Calculator - solve ax² + bx + c = 0, including complex roots.
- Slope Calculator - the slope, y-intercept, and full equation of a line through two points.
Geometry
Shapes, area, volume, and triangles.
- Area Calculator - area for squares, rectangles, circles, triangles, and trapezoids.
- Volume Calculator - volume for cubes, boxes, spheres, cylinders, and cones.
- Circle Calculator - enter any one of radius, diameter, circumference, or area to find the rest.
- Triangle Calculator - area, perimeter, and all three angles from three side lengths.
- Pythagorean Theorem Calculator - find the missing side of a right triangle.
Statistics & probability
Making sense of a set of numbers.
- Average Calculator - mean, median, mode, and range from a list of numbers.
- Standard Deviation Calculator - mean, variance, and population or sample standard deviation.
- Probability Calculator - a single event's probability, or combined AND / OR probability for two events.
- Percent Error Calculator - how far a measured value is from the accepted value, as a percentage.
- P-Value Calculator - the p-value from a z-score, one-tailed or two-tailed.
- Confidence Interval Calculator - a confidence interval from a sample mean, standard deviation, and sample size.
General tools
A full calculator for everything else.
- Scientific Calculator - a complete interactive calculator with trigonometry, logarithms, and powers.
Frequently asked questions
Are these math calculators free to use?
Yes - all 23 tools on this page are free, with no account or sign-up required.
Do these tools show the steps, or just the answer?
Every calculator on this page shows its formula and a fully worked example directly on the page, so you can see the method behind the result, not just the final number.
Is any of the information I enter saved?
No. Every calculation runs directly in your browser - nothing you type is sent to a server or stored anywhere.
Which calculator should I use for homework help?
Start with the topic you're studying using the section headings above. Each tool's step-by-step guide and worked example are designed to help you understand the method, not just check an answer.
Looking for a different category? Browse all calculators on the homepage. For articles and updates about these tools, see all Math Calculators posts.