Math Calculators
More Tools
About These Math Calculators
This collection of 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
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.