Calculators
Everyday arithmeticPercentage of a Number CalculatorWork out X% of a number, or add or take off a percentage such as GST or a discount.Everyday arithmeticWhat Percent Is X of Y CalculatorFind what percent one number is of another, such as marks out of a total.Everyday arithmeticPercentage Change CalculatorThe percentage increase or decrease from one value to another, and the percentage difference.Everyday arithmeticFraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers, simplified to lowest terms, with decimal and percent forms.Everyday arithmeticSimplify Fractions CalculatorReduce a fraction to lowest terms by its greatest common divisor, with every step shown.Number systemsBase ConverterConvert between decimal, hexadecimal, binary, octal and any base from 2 to 36, with grouped binary digits.Number theoryGCD and LCM CalculatorFind the GCD (HCF) and LCM of two or more numbers, with every step of the Euclidean algorithm.Number theoryPrime Factorization CalculatorBreak any whole number into prime powers, with a division ladder, every divisor and the divisor count and sum.Interactive toolsMatiks Number ExplorerType numbers separated by spaces and instantly see prime factors, LCM, GCD, roots and sums of squares.
Maths you can follow, not just answers
Every calculator here shows how it reached the answer: the Euclidean steps behind a GCD, the common denominator behind a fraction sum, the division ladder behind a prime factorisation. That makes them useful for checking homework as well as for getting a quick result.
Exact where it matters
Fractions stay as fractions and whole numbers stay exact, even with dozens of digits, so there is no rounding drift. Decimals that repeat are shown with their repeating digits, such as 1/7 = 0.(142857).
Private by design
All of the maths runs in your browser. Nothing you type is uploaded, and a page keeps working after it has loaded, even offline. Each calculator also keeps its inputs in the link, so you can bookmark or share a worked answer.
Frequently asked questions
Are calculations done on a server?
No. Every MathTools calculator runs entirely in your browser. Nothing you type is sent anywhere, so it is private and works without delay.
Which calculators are available?
A percentage calculator, a fraction calculator, a base converter for decimal, hex, binary and octal, a GCD and LCM calculator, a prime factorisation calculator, and the Matiks number explorer for quick mental maths checks.
Are the calculators free for school and work?
Yes. Every calculator is free with no sign-up and no limits, for students, teachers, developers and anyone else.
Do the calculators work offline?
Once a page has loaded it keeps working without a connection, because all the maths runs in the page itself.
What can the scratchpad on this page do?
It evaluates any arithmetic expression as you type: + - × ÷, powers with ^, remainders with %, factorials with !, brackets, square and cube roots, sin, cos and tan in radians, natural and base-10 logs, pi and e.