One library. Every calculation.
Math and computer science calculators that show the working
Whether you're checking homework, revising for an exam or converting file sizes at work, pick a calculator, enter your numbers and see each step that leads to the answer, not just the result.
Math tools cover fractions, percentages, algebra, geometry and statistics. Computer science tools handle binary, hexadecimal, data units and transfer times, with short explanations that help the method stick.
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Basic Math
Use our basic maths calculators for percentages, everyday calculations and quick number problems.
Open Basic Math → AAlgebra
Choose a linear, quadratic, simultaneous or polynomial equation solver. Explore exact answers, worked steps and graphs.
Open Algebra → GGeometry
Calculate rectangle, square, triangle and circle areas with formulas and practical examples.
Open Geometry →Available now
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Mixed Numbers Calculator
Add, subtract, multiply and divide mixed numbers, fractions, whole numbers and decimals with reduced results.
Open calculator → mRatio Calculator
Simplify ratios, compare equivalent ratios and solve missing values in proportions.
Open calculator → aLinear Equation Calculator with Steps
Solve linear equations with x on both sides. Get exact fractions, worked steps and a graph.
Open calculator → aSystem of Equations Calculator with Steps
Solve two or three simultaneous linear equations with exact fractions, elimination steps and solution verification.
Open calculator → gCircle Area Calculator with Formula
Calculate circle area with clear formulas, measurements, practical examples and square units.
Open calculator → gTriangle Area Calculator with Formula
Calculate triangle area with clear formulas, measurements, practical examples and square units.
Open calculator →Why AbacaDigital
Every answer has a method.
We show you the method.
An answer on its own won't help you in an exam or explain why your file transfer is slower than expected. Each calculator shows the steps it took, the rule or formula it used and where rounding comes in.
Show the working
Follow each step from your input to the answer, then change a value and see how the result changes.
Clear about the rules
Each calculator says which convention it uses, such as 1,000 or 1,024 bytes in a kilobyte, or how many decimal places it rounds to.
Private by design
Calculations run in your browser. The numbers you enter are never stored on our servers.
Calculators for homework, exams and everyday tech
Simplifying a fraction, solving an equation or checking a statistics answer? Converting binary to decimal, or working out how long a 4 GB download will take? Pick a calculator, enter your numbers and get the answer with the steps that lead to it.
The math tools cover fractions, percentages, algebra, geometry and statistics. The computer science tools cover number systems, data units, file sizes and transfer times. Each one includes a short explanation, so you can use the same method yourself next time.
Results are for learning and checking your work. Teachers, exam boards and software can use different rounding, notation or unit conventions, so follow the method you've been asked to use when it matters.