Maths. Solved.
Free calculators for every maths topic — with step-by-step working shown. Used by students worldwide from age 10 through university.
Most popular calculators
The tools students search for most — built to perfection.
Fraction Calculator
Add, subtract, multiply and divide fractions instantly
Percentage Calculator
Find percentages, percentage change and more instantly
Long Division Calculator
Full long division working shown step by step
Quadratic Formula Calculator
Solve any quadratic equation with full working shown
Browse by subject
Ten subject areas, 60 calculators — all free, all with working shown.
All calculators
Search by name or topic, or filter by subject.
60 calculators
Fraction Calculator
Add, subtract, multiply and divide fractions instantly
Adding Fractions Calculator
Add any two fractions with step-by-step working
Subtracting Fractions Calculator
Subtract fractions with full step-by-step working
Multiplying Fractions Calculator
Multiply fractions and mixed numbers with working shown
Dividing Fractions Calculator
Divide fractions using the flip-and-multiply method
Simplifying Fractions Calculator
Reduce any fraction to its simplest form instantly
Fraction to Decimal Calculator
Convert any fraction to a decimal with working shown
Decimal to Fraction Calculator
Convert any decimal to a fraction in simplest form
Mixed Number Calculator
Add, subtract, multiply and divide mixed numbers
Comparing Fractions Calculator
Find which fraction is larger with full working shown
Percentage Calculator
Find percentages, percentage change and more instantly
Percentage of a Number
Find X% of any number with working shown
Percentage Change Calculator
Calculate percentage increase or decrease with working
Percentage Increase Calculator
Calculate the new value after a percentage increase
Percentage Decrease Calculator
Calculate the new value after a percentage decrease
Reverse Percentage Calculator
Find the original value before a percentage change
Percentage to Decimal Calculator
Convert any percentage to a decimal instantly
Decimal to Percentage Calculator
Convert any decimal to a percentage instantly
Prime Number Checker
Check if any number is prime — with explanation
Prime Factorisation Calculator
Break any number into its prime factors with a factor tree
HCF Calculator
Find the highest common factor using the Euclidean algorithm
LCM Calculator
Find the lowest common multiple with step-by-step working
Factors Calculator
Find all factors of any number instantly
Square Root Calculator
Find the square root of any number with working shown
Cube Root Calculator
Find the cube root of any number with working shown
Rounding Calculator
Round to decimal places or significant figures with working
Long Division Calculator
Full long division working shown step by step
Long Multiplication Calculator
Long multiplication with full written working shown
Order of Operations Calculator
Solve expressions using BODMAS/PEMDAS with working
Negative Numbers Calculator
Add, subtract, multiply and divide with negatives
Quadratic Formula Calculator
Solve any quadratic equation with full working shown
Linear Equation Solver
Solve linear equations with full working shown
Simultaneous Equations Solver
Solve two equations with two unknowns — step by step
Expanding Brackets Calculator
Expand single and double brackets with working shown
Factorising Calculator
Factorise expressions with full working shown
Nth Term Calculator
Find the nth term formula for any arithmetic sequence
Area Calculator
Calculate the area of any 2D shape with working shown
Perimeter Calculator
Calculate the perimeter of any 2D shape with working
Volume Calculator
Calculate the volume of any 3D shape with working shown
Circle Calculator
Find radius, diameter, area and circumference instantly
Pythagoras Theorem Calculator
Find any side of a right triangle using a² + b² = c²
Surface Area Calculator
Calculate the surface area of any 3D shape with working
Mean, Median, Mode Calculator
Calculate all averages and range with step-by-step working
Standard Deviation Calculator
Calculate standard deviation with full working shown
Range Calculator
Find the range of a dataset instantly
Frequency Table Calculator
Find mean, median and mode from a frequency table
Probability Calculator
Calculate probability as a fraction, decimal and percentage
Cumulative Frequency Calculator
Build cumulative frequency tables and find quartiles
Ratio Calculator
Simplify ratios and share amounts in a given ratio
Ratio Simplifier
Simplify any ratio to its lowest terms with working
Direct Proportion Calculator
Solve direct proportion problems using the unitary method
Inverse Proportion Calculator
Solve inverse proportion problems with step-by-step working
Sin Cos Tan Calculator
Calculate sin, cos and tan of any angle with working
Trigonometry Calculator
Find any side or angle in a right triangle with working
Angle Calculator
Find missing angles in polygons, triangles and on lines
Bearing Calculator
Calculate bearings and compass directions with working
Times Tables Tester
Practise times tables with instant feedback
Square Numbers Reference
Square numbers 1–20 and cube numbers 1–10
GCSE Maths Formula Sheet
Every GCSE maths formula you need — all in one place
Maths Glossary
Plain English definitions for every maths term
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