Math Tools
9 focused calculators for the jobs a plain keypad handles badly. Each one shows its working, not just an answer.
Fraction Calculator
Add, subtract, multiply and divide fractions with the steps shown.
Open
Percentage Calculator
Percentage of a number, increase, decrease and reverse percentages.
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Prime Number Checker
Test whether a number is prime and see its factors if it is not.
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GCF and LCM Calculator
Greatest common factor and lowest common multiple, with the factors listed.
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Roman Numeral Converter
Convert numbers to Roman numerals and read numerals back as numbers.
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Times Table Generator
Print or practise any multiplication table up to whatever range you need.
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Exponent Calculator
Powers, roots and negative or fractional exponents, worked out.
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Ratio Calculator
Simplify ratios, scale them up or down, and solve for a missing part.
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Number Base Converter
Convert between binary, decimal, octal and hexadecimal.
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When a Dedicated Tool Beats the Calculator
The main calculator handles anything you can express as a single line of arithmetic. These pages exist for the questions that are several steps long, where the steps themselves are where mistakes happen: reducing a fraction, finding a common denominator, working a percentage backwards from a discounted price.
Each tool shows the intermediate working rather than only the result, which matters when the method is what is being marked.
All of It Runs on Your Device
Every tool here is JavaScript executing in your browser. Nothing you type is uploaded, there is no account, and each page keeps working if the connection drops after it has loaded.