Math Calculators

Percentages, fractions, averages, primes, and everyday math.

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Percentage Calculator

Math Calculators

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Find X% of Y, increase or decrease by a percentage.
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Fraction Calculator

Math Calculators

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Add, subtract, multiply, and divide fractions.
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Ratio Calculator

Math Calculators

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Simplify and scale ratios.
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Average Calculator

Math Calculators

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Calculate mean, median, and mode.
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Standard Deviation Calculator

Math Calculators

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Compute standard deviation and variance.
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Modulo Calculator

Math Calculators

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Calculate remainder after division.
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LCM & GCD Calculator

Math Calculators

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Find least common multiple and greatest common divisor.
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Prime Number Checker

Math Calculators

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Check if a number is prime.
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Scientific Notation Converter

Math Calculators

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Convert numbers to and from scientific notation.
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Quadratic Equation Solver

Math Calculators

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Solve quadratic equations ax² + bx + c = 0.
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Permutation & Combination

Math Calculators

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Calculate nPr and nCr values.
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Logarithm Calculator

Math Calculators

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Calculate log, ln, and antilog values.

FAQ

Common questions about Math Calculators on the Developer Tools Hub.

Percentages, fractions, averages, primes, and everyday math. All tools in this category are designed to run instantly in your browser.
Yes. All tools in this category are free to use with no sign-up required.
Live tools in this category process input locally in your browser. Your text, numbers, and files are not uploaded to my server.
New utilities are published regularly. Bookmark this category page to see when more math calculators go live.