Mathematics
Percentages, equations, fractions, combinatorics and other math calculations for school and work. From basic percents to equations in one place.
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Percentage Change
Calculate increase or decrease as ((new − original) / original) × 100 for prices, wages, or metrics.
What Percent is X of Y
Convert a share to percent with (X / Y) × 100 for grades, test scores, costs, or budgets.
Increase and Decrease by Percent
Adds or subtracts a given percent from a base value: new = base × (1 ± p/100).
Rule of Three
Solves direct proportion: finds unknown x from a : b = c : x.
Ratio Calculator
Simplifies and computes the ratio of two numbers and scales them to a common measure.
Fractions
Adds, subtracts, multiplies, and divides fractions and converts them to decimals.
Powers
Computes powers by raising a base to an exponent: aⁿ.
Roots
Calculates roots of a given order from a number, including square and cube roots.
Logarithms
Calculates natural ln and base-10 logarithms and solves bˣ = y.
Scientific Notation
Converts numbers between standard and scientific form a × 10ⁿ.
GCD, Greatest Common Divisor
Finds the greatest common divisor of two integers using Euclid's algorithm.
LCM, Least Common Multiple
Calculates the least common multiple: |a×b| / GCD(a,b).
Prime Number
Checks whether a number is prime and finds nearby primes.
Prime Factorization
Factors an integer into a product of prime powers.
Factorial
Computes n! as the product of all positive integers from 1 to n.
Permutations
Counts arrangements of n items: n! or n!/(n-k)! when choosing k items.
Combinations
Counts combinations C(n,k) = n! / (k!(n-k)!) regardless of order.
Binomial Coefficient
Calculates the binomial coefficient (n choose k) for combinatorics.
Linear Equation
Solves a linear equation ax + b = 0 and returns root x = -b/a.
Quadratic Equation
Solves ax² + bx + c = 0 using discriminant D = b² - 4ac.
System of Two Equations
Solves a system of two linear equations in two unknowns by substitution or elimination.