Free Math Tools Online

Interactive calculators and converters for every math task - no download, no sign-up. Pick any tool to get started.

Scientific Calculator sin, cos, tan, log, ln, x², factorial and more Divisibility Checker Check even/odd and divisibility by 2 through 10 Fraction - Decimal Convert fractions to decimals and back instantly Fraction Simplifier Reduce any fraction to its simplest form using GCD LCM & GCD Calculator Find LCM and GCD of any two numbers instantly Multiplication Table Generate times tables for any number instantly Place Value Explainer Break numbers into ones, tens, hundreds and beyond Prime Number Checker Check if any number is prime or composite instantly Roman Numeral Converter Convert numbers to Roman numerals and back Sequence Finder Detect arithmetic, geometric and Fibonacci patterns Shape Calculator Area and perimeter for squares, triangles, circles Number Base Converter Convert between binary, octal, decimal and hex

What Are These Math Tools?

Each tool on this page is built for a specific type of calculation that a general-purpose calculator doesn't handle well. Instead of a blank input box, you get a purpose-built interface - a numpad for checking primes, a table generator for times tables, a symbol reference for Roman numerals. Every tool runs entirely in your browser with no installation and no account needed.

Who Uses These Tools?

Students use the fraction simplifier and LCM calculator for homework, the multiplication table generator to practice times tables, and the divisibility checker to verify factors quickly. Teachers use the place value explainer as a visual aid for early arithmetic lessons. Developers and CS students reach for the number base converter to work between binary, hex and decimal. Anyone who needs to convert Roman numerals, check a prime number, or calculate the area of a shape can get an instant answer here.

Scientific Calculator

The scientific calculator gives you full trigonometry (sin, cos, tan and their inverses), logarithms in base 10, base e and base 2, square root, cube root, powers, factorials and the constants pi and e. It supports both DEG and RAD mode, chains of operations, parentheses and keyboard input. Designed to match the layout and logic of a physical Casio or TI calculator so there is no learning curve.

Fraction and Decimal Tools

The fraction simplifier reduces any fraction to its lowest terms in one step by computing the GCD of the numerator and denominator using Euclid's algorithm. The fraction-to-decimal converter works in both directions - enter a fraction like 3/8 to get 0.375, or enter a decimal like 0.666 to get 2/3. The LCM and GCD calculator finds the least common multiple and greatest common divisor of any two numbers, showing the full prime factorisation so you can see why the answer is correct.

Number and Pattern Tools

The prime number checker uses trial division up to the square root of the input to determine primality in milliseconds - useful for any number up to the JavaScript safe integer limit. The sequence finder analyses a list of numbers you enter and identifies whether the pattern is arithmetic (constant difference), geometric (constant ratio), Fibonacci, square, cube or triangular, then predicts the next several terms. The number base converter shows binary, octal, decimal and hexadecimal all at once, with a visual bit display that updates in real time as you type.

Geometry and Table Tools

The shape calculator covers circles, rectangles, triangles and squares - enter the dimensions and get area and perimeter immediately. The multiplication table generator creates a full 12-row times table for any number from 1 to 9999, with a quick-tap preset row for 1 through 12. The place value explainer breaks any number down into its positional columns - ones, tens, hundreds, thousands and beyond - with each digit highlighted in its own column so the concept is immediately visual.