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Maths. Solved.

Free calculators for every maths topic — with step-by-step working shown. Used by students worldwide from age 10 through university.

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The tools students search for most — built to perfection.

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Ten subject areas, 60 calculators — all free, all with working shown.

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60 calculators

FractionsFlagship

Fraction Calculator

Add, subtract, multiply and divide fractions instantly

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FractionsGCSE · SAT · ACT · IB

Adding Fractions Calculator

Add any two fractions with step-by-step working

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FractionsGCSE · SAT · ACT · IB

Subtracting Fractions Calculator

Subtract fractions with full step-by-step working

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FractionsGCSE · SAT · ACT · IB

Multiplying Fractions Calculator

Multiply fractions and mixed numbers with working shown

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FractionsGCSE · SAT · ACT · IB

Dividing Fractions Calculator

Divide fractions using the flip-and-multiply method

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FractionsGCSE · SAT · ACT · IB

Simplifying Fractions Calculator

Reduce any fraction to its simplest form instantly

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FractionsGCSE · SAT · ACT · IB

Fraction to Decimal Calculator

Convert any fraction to a decimal with working shown

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FractionsGCSE · SAT · ACT · IB

Decimal to Fraction Calculator

Convert any decimal to a fraction in simplest form

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FractionsGCSE · SAT · ACT · IB

Mixed Number Calculator

Add, subtract, multiply and divide mixed numbers

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FractionsGCSE · SAT · ACT · IB

Comparing Fractions Calculator

Find which fraction is larger with full working shown

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PercentagesFlagship

Percentage Calculator

Find percentages, percentage change and more instantly

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PercentagesGCSE · SAT · ACT · IB

Percentage of a Number

Find X% of any number with working shown

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PercentagesGCSE · SAT · ACT · IB

Percentage Change Calculator

Calculate percentage increase or decrease with working

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PercentagesGCSE · SAT · ACT · IB

Percentage Increase Calculator

Calculate the new value after a percentage increase

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PercentagesGCSE · SAT · ACT · IB

Percentage Decrease Calculator

Calculate the new value after a percentage decrease

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PercentagesGCSE · SAT · ACT · IB

Reverse Percentage Calculator

Find the original value before a percentage change

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PercentagesGCSE · SAT · ACT · IB

Percentage to Decimal Calculator

Convert any percentage to a decimal instantly

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PercentagesGCSE · SAT · ACT · IB

Decimal to Percentage Calculator

Convert any decimal to a percentage instantly

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NumbersGCSE · SAT · ACT · IB

Prime Number Checker

Check if any number is prime — with explanation

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NumbersGCSE · ACT · IB

Prime Factorisation Calculator

Break any number into its prime factors with a factor tree

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NumbersGCSE · ACT · IB

HCF Calculator

Find the highest common factor using the Euclidean algorithm

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NumbersGCSE · SAT · ACT · IB

LCM Calculator

Find the lowest common multiple with step-by-step working

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NumbersGCSE · ACT · IB

Factors Calculator

Find all factors of any number instantly

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NumbersGCSE · SAT · ACT · IB

Square Root Calculator

Find the square root of any number with working shown

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NumbersGCSE · ACT · IB

Cube Root Calculator

Find the cube root of any number with working shown

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NumbersGCSE · SAT · ACT · IB

Rounding Calculator

Round to decimal places or significant figures with working

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Long DivisionFlagship

Long Division Calculator

Full long division working shown step by step

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Long DivisionGCSE · ACT

Long Multiplication Calculator

Long multiplication with full written working shown

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Long DivisionGCSE · SAT · ACT · IB

Order of Operations Calculator

Solve expressions using BODMAS/PEMDAS with working

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Long DivisionGCSE · SAT · ACT · IB

Negative Numbers Calculator

Add, subtract, multiply and divide with negatives

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AlgebraFlagship

Quadratic Formula Calculator

Solve any quadratic equation with full working shown

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AlgebraGCSE · SAT · ACT · IB

Linear Equation Solver

Solve linear equations with full working shown

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AlgebraGCSE · SAT · ACT · IB

Simultaneous Equations Solver

Solve two equations with two unknowns — step by step

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AlgebraGCSE · SAT · ACT · IB

Expanding Brackets Calculator

Expand single and double brackets with working shown

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AlgebraGCSE · SAT · ACT · IB

Factorising Calculator

Factorise expressions with full working shown

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AlgebraGCSE · IB

Nth Term Calculator

Find the nth term formula for any arithmetic sequence

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GeometryGCSE · SAT · ACT · IB

Area Calculator

Calculate the area of any 2D shape with working shown

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GeometryGCSE · SAT · ACT · IB

Perimeter Calculator

Calculate the perimeter of any 2D shape with working

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GeometryGCSE · SAT · ACT · IB

Volume Calculator

Calculate the volume of any 3D shape with working shown

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GeometryGCSE · SAT · ACT · IB

Circle Calculator

Find radius, diameter, area and circumference instantly

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GeometryGCSE · SAT · ACT · IB

Pythagoras Theorem Calculator

Find any side of a right triangle using a² + b² = c²

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GeometryGCSE · SAT · ACT · IB

Surface Area Calculator

Calculate the surface area of any 3D shape with working

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StatisticsGCSE · SAT · ACT · IB

Mean, Median, Mode Calculator

Calculate all averages and range with step-by-step working

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StatisticsGCSE · SAT · ACT · IB

Standard Deviation Calculator

Calculate standard deviation with full working shown

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StatisticsGCSE · SAT · ACT · IB

Range Calculator

Find the range of a dataset instantly

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StatisticsGCSE · IB

Frequency Table Calculator

Find mean, median and mode from a frequency table

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StatisticsGCSE · SAT · ACT · IB

Probability Calculator

Calculate probability as a fraction, decimal and percentage

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StatisticsGCSE · IB

Cumulative Frequency Calculator

Build cumulative frequency tables and find quartiles

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RatiosGCSE · SAT · ACT · IB

Ratio Calculator

Simplify ratios and share amounts in a given ratio

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RatiosGCSE · SAT · ACT · IB

Ratio Simplifier

Simplify any ratio to its lowest terms with working

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RatiosGCSE · SAT · ACT · IB

Direct Proportion Calculator

Solve direct proportion problems using the unitary method

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RatiosGCSE · IB

Inverse Proportion Calculator

Solve inverse proportion problems with step-by-step working

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TrigonometryGCSE · SAT · ACT · IB

Sin Cos Tan Calculator

Calculate sin, cos and tan of any angle with working

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TrigonometryGCSE · SAT · ACT · IB

Trigonometry Calculator

Find any side or angle in a right triangle with working

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TrigonometryGCSE · SAT · ACT · IB

Angle Calculator

Find missing angles in polygons, triangles and on lines

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TrigonometryGCSE · IB

Bearing Calculator

Calculate bearings and compass directions with working

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RevisionGCSE

Times Tables Tester

Practise times tables with instant feedback

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RevisionGCSE · SAT · ACT · IB

Square Numbers Reference

Square numbers 1–20 and cube numbers 1–10

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RevisionGCSE

GCSE Maths Formula Sheet

Every GCSE maths formula you need — all in one place

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RevisionGCSE · SAT · ACT · IB

Maths Glossary

Plain English definitions for every maths term

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Why every answer shows its working

Most calculators give you the answer and nothing else. That's fine for checking, but useless for learning. When you sit an exam, the method is what earns the marks — not just the final number.

Every Pythagorist tool shows the complete step-by-step working: which formula to use, how to substitute values, and why each step follows from the last. It's like having a maths tutor next to you, available 24 hours a day.

Try the fraction calculator