Math & education
Fractions, equations, geometry, grades and study calculators.
27 tools in this category
Roman Numeral Converter
Convert Roman numerals to numbers and back, for values from 1 to 3999. Auto-detects the direction. Runs in your browser.
Math & education
Quadratic Equation Solver
Solve ax² + bx + c = 0 — real or complex roots, discriminant and vertex, with the steps. Runs in your browser.
Math & education
Exponent Calculator
Raise any base to any power — including negative and fractional exponents. Runs in your browser.
Math & education
Number Base Converter
Convert whole numbers between binary, octal, decimal and hexadecimal at once. BigInt-precise, in your browser.
Math & education
Prime Number Checker
Check whether a number is prime, with its prime factorisation and the nearest primes. Runs in your browser.
Math & education
GCD and LCM Calculator
Find the greatest common divisor and least common multiple of two or more whole numbers. Runs in your browser.
Math & education
Logarithm Calculator
Find the logarithm of a number in any base, plus natural log, log₁₀ and log₂. Runs in your browser.
Math & education
Permutation and Combination Calculator
Compute nPr and nCr exactly — ordered arrangements and unordered selections of r items from n. Runs in your browser.
Math & education
Factorial Calculator
Compute n! exactly for any non-negative whole number, with full digits and a scientific estimate. Runs in your browser.
Math & education
Geometric Sequence Calculator
Find the nth term and the sum of a geometric sequence from its first term, common ratio and length. Runs in your browser.
Math & education
Fibonacci Calculator
Find the nth Fibonacci number exactly and list the sequence 1, 1, 2, 3, 5, 8… Runs in your browser.
Math & education
Test Score Calculator
Turn points earned out of the total into a percentage score, with a pass/fail check. Runs in your browser.
Math & education
Weighted Average Calculator
Average a list of values by their weights — for weighted grades, ratings and more. Runs in your browser.
Math & education
Arithmetic Sequence Calculator
Find the nth term and the sum of an arithmetic sequence from its first term, common difference and length. Runs in your browser.
Math & education
Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers, with the result reduced to lowest terms.
Math & education
Modulo Calculator
Find the remainder and quotient when dividing two integers, with correct handling of negatives. Runs in your browser.
Math & education
Percent Error Calculator
Compare a measured value to the expected one and get the percent error, with direction. Runs in your browser.
Math & education
Circle Calculator
Enter any one of radius, diameter, circumference or area and get the other three instantly.
Math & education
Decimal to Fraction
Turn a decimal into its simplest fraction, including a mixed number for values above one.
Math & education
Fraction Simplifier
Reduce a fraction to its lowest terms, showing the divisor, mixed number and decimal.
Math & education
Fraction to Decimal
Turn a fraction or mixed number into its decimal value, noting whether it terminates or repeats.
Math & education
Grade Average Calculator
Paste your grades to get the average — a simple mean, or a weighted average by credits or hours. Runs in your browser.
Math & education
Standard Deviation Calculator
Sample and population standard deviation, variance, mean and sum from a pasted list of numbers.
Math & education
Percentage to Fraction
Convert a percentage to its simplest fraction — e.g. 25% becomes 1/4. Runs in your browser.
Math & education
Pythagorean Theorem Calculator
Solve a right triangle with a² + b² = c²: find the hypotenuse or a missing leg, plus area and perimeter.
Math & education
Scientific Notation Converter
Convert numbers to and from scientific notation, E notation and engineering notation.
Math & education
Triangle Calculator
Enter three sides to get a triangle’s area, perimeter, angles and type (right, acute or obtuse).
Math & education