Absolute Value Calculator
Calculate the absolute value of any number. Find the distance from zero, solve absolute value equations, and understand |x| notation.
Free Math Calculators
25 toolsFractions, ratios, roots, logs, and number theory calculators. Browse our free math tools below — no sign-up required.
Combination Calculator
Calculate combinations C(n, r) — the number of ways to choose r items from n without regard to order.
Cube Root Calculator
Calculate the cube root of any number, including negatives. Find the value that when cubed gives the original number. Free ∛ calculator online.
Decimal to Fraction Converter
Convert any decimal number to a simplified fraction. Handles terminating and repeating decimals with GCD reduction for the simplest form.
Exponent Calculator
Calculate any base raised to any exponent (power). Compute base^exponent for integers, decimals, and negative exponents. Free power calculator.
Factorial Calculator
Calculate the factorial of any non-negative integer (n!). See step-by-step multiplication and related values.
Fraction Calculator
Perform addition, subtraction, multiplication, and division on fractions. Get simplified results using GCD.
Fraction to Decimal Converter
Convert any fraction to its decimal equivalent by dividing the numerator by the denominator. Handles proper, improper, and mixed fractions with high precision.
GCD Calculator
Calculate the Greatest Common Divisor (GCD) of two or more numbers using the Euclidean algorithm. Also known as GCF or HCF.
LCM Calculator
Calculate the Least Common Multiple (LCM) of two numbers using the GCD method. Formula: LCM(a,b) = |a×b| / GCD(a,b).
Logarithm Calculator
Calculate logarithms of any base. Compute log_b(x) = ln(x)/ln(b) for common, natural, and custom base logarithms.
Modular Arithmetic Calculator
Calculate modular arithmetic operations: a mod n, modular addition, subtraction, multiplication, and exponentiation.
Nth Root Calculator
Calculate any nth root of a number. Find the value that when raised to the nth power gives the original number. Supports any root index.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal. Supports bases 2 through 36.
Permutation Calculator
Calculate permutations P(n, r) — the number of ordered arrangements of r items from n.
Prime Factorization Calculator
Find the prime factorization of any positive integer. Breaks down numbers into their prime factors using trial division.
Prime Number Checker
Check if any number is prime using trial division up to its square root. Determine primality and see the smallest factor if composite.
Proportion Solver
Solve any proportion a/b = c/d for the missing value using cross-multiplication. Enter three values and find the fourth with the full equation shown.
Ratio Calculator
Simplify ratios using GCD and solve proportions like a:b = c:? for math work, cooking adjustments, layouts, and scale drawings.
Roman Numeral Converter
Convert between Roman numerals and decimal numbers. Supports values from 1 to 3,999.
Rounding Calculator
Round numbers to any decimal place, whole number, or significant figure. Supports round half up, half down, half even, ceiling, and floor modes.
Scale Ratio Calculator
Convert between drawing/model measurements and actual dimensions using scale ratios. Calculate actual size from scale measurements with the scale formula shown.
Scientific Notation Converter
Convert numbers to and from scientific notation. Transform large or small numbers into a × 10^n format.
Significant Figures Calculator
Count significant figures and round numbers to a specified number of sig figs. Review how precision rules apply to each digit.
Square Root Calculator
Calculate the square root of any number. Supports positive numbers, perfect squares detection, and decimal precision.