18 free tools
Maths Calculators
Everyday maths made quick — percentages, fractions, ratios, averages and more, each with the working shown.
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Percentage Calculator
The three percentage questions you actually ask — answered instantly.
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Scientific Calculator
Everyday arithmetic plus trigonometry, logs, powers and roots — free, fast and available…
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GPA Calculator
Add your courses, pick each grade and its credit hours, and get your weighted grade point…
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Random Number Generator
Generate one or many random numbers in any range — perfect for prize draws, games, sampling…
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Fraction Calculator
Add, subtract, multiply or divide two fractions — simplified automatically, with decimal and…
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Average Calculator
Paste any list of numbers to get the mean, median, mode, sum, range and more — instantly.
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Ratio Calculator
Simplify any ratio to its lowest terms, or solve a proportion to find a missing value.
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Roman Numeral Converter
Convert numbers to Roman numerals and back again — with automatic validation of standard form.
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Basic Calculator
Type an everyday sum — with brackets, percentages and decimals — and see the answer, rounded…
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Algebra Calculator
Solve a linear equation of the form ax + b = cx + d for x, with every rearranging step shown.
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Quadratic Equation Calculator
Solve ax² + bx + c = 0 for both roots, with the discriminant, vertex and axis of symmetry…
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LCM & GCD Calculator
Find the greatest common divisor and lowest common multiple of any list of whole numbers,…
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Exponent Calculator
Raise any number to any power, including negative and fractional exponents, with the…
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Grade Calculator
Turn marks earned out of a total into a percentage, a letter grade, a grade point and a UK…
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Final Grade Calculator
Work out the score you need in the final exam to reach the overall grade you are aiming for.
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Weighted Grade Calculator
Combine coursework, essays and exams that carry different weightings into one overall module…
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CGPA Calculator
Calculate cumulative grade point average across every module, weighted by credit hours, on a…
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Test Score Calculator
Convert questions answered correctly into a percentage and letter grade, and see how many…
About these tools
Whether you are checking a percentage change, simplifying a fraction or finding an average, these tools show how the answer is reached so you can learn the method, not just copy the number. Browse more in our full tool directory or read the guides in our articles.
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