Math calculators
These math tools cover percentages, scientific evaluation, number theory, and equation helpers with the working shown beside the form. Use a hub page like this to jump straight to a calculator instead of filtering the catalog.
Each linked tool keeps its own URL under /c/ and explains the formula in How it works. Start with percentage, the scientific calculator, or a specific algebra or number-theory page.
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Math
Binary Calculator
Convert an integer to binary (and hex) representation.
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Math
Euler Totient Calculator
Compute Euler's totient φ(n) for bounded educational integers—the count of integers up to n that are coprime to n.
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Math
Exponent Calculator
Raise a base to a power: base^exponent.
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Math
Extended GCD / Modular Inverse
Compute the extended GCD, Bézout coefficients, and modular inverse when it exists. Educational BigInt calculator.
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Math
Fraction Calculator
Simplify fractions or add, subtract, multiply, and divide them.
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Math
Function Grapher
Plot y = f(x) over a chosen domain, with an optional second curve.
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Math
GCD and LCM Calculator
Greatest common divisor and least common multiple of two integers.
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Hex Calculator
Convert an integer to hexadecimal (and binary).
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Math
Linear Equation Calculator
Solve a x + b = c for x.
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Math
Log Base 2 Calculator
Compute the base-2 logarithm of a positive number.
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Math
Log Calculator
Compute a logarithm for a chosen base (default base 10).
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Math
Matrix 2×2 Calculator
Determinant and inverse of a 2×2 matrix.
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Math
Modular Exponentiation Calculator
Compute base^exponent mod modulus with BigInt square-and-multiply. Useful for understanding RSA-style operations (educational).
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Math
Percent Given Value Calculator
Find what percent one number is of another.
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Math
Percentage Calculator
Find a percent of a number, reverse percentages, and percent change.
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Math
Percentage Error Calculator
Relative error between experimental and theoretical values as a percent.
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Math
Permutation and Combination Calculator
Compute P(n, r), C(n, r), and n! for non-negative integers.
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Math
Prime Factors Calculator
Factor an integer into primes.
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Math
Proportion Calculator
Solve a/b = c/x for x.
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Math
Quadratic Equation Calculator
Solve ax² + bx + c = 0 for real roots.
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Math
Remainder Calculator
Divide two numbers and show remainder (modulo) and quotient.
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Math
Rounding Calculator
Round a number to a chosen number of decimal places.
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Math
Scientific Calculator
Keyboard-first scientific calculator with DEG/RAD trig, 2nd functions, memory, history, and display modes.
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Math
Significant Figures Calculator
Round a number to a given count of significant figures.
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Math
Toy RSA Demonstrator
Walk through tiny RSA with user-provided small primes: n, φ(n), e, d, and encrypt/decrypt steps. Educational only—not production keys.
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Math
Two's (2's) Complement Calculator
Show the two's-complement binary and hex encoding of a signed integer.
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Math
Value Given Percent Calculator
Find P% of a whole number.
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