Maths & Science
Geometry, algebra, physics, chemistry, statistics calculators
Maths
10Fraction Calculator
Add, subtract, multiply and divide fractions with step-by-step working. Shows results as improper fraction, mixed number and decimal
Logarithm Calculator
Calculate logarithms in any base with presets for log10, natural log and log2 plus antilog and change of base formula
Maths Worksheet Generator
Generate printable maths worksheets with addition, subtraction, multiplication, and division. Set difficulty, number range, and question count. Includes answer keys.
Number to Words Converter
Convert any number to written English words. Supports negatives, decimals, and numbers up to quadrillions. Toggle between UK and US English formats.
Percentage Calculator
Calculate percentages easily — find X% of a number, percentage change, increase and decrease. Four calculators in one tool.
Sum Calculator
Add up numbers instantly. Paste numbers in any format - one per line, comma-separated, or mixed in with text. Shows sum, average, min, max, and count.
Times Tables Practice
Interactive times tables drill with instant feedback and score tracking. Pick your tables, race the clock, and print practice worksheets. Perfect for kids and classrooms.
Greatest Common Factor Calculator
Find the GCF and LCM of two or more numbers with prime factorisation and step-by-step Euclidean algorithm working
Prime Number Checker
Check if a number is prime, see its factors if composite, and find the next 10 prime numbers with list primes up to N
Scientific Notation Converter
Convert between standard and scientific notation showing mantissa and exponent separately for very large and small numbers
Percentage
5Percentage Calculator
Calculate percentages easily — find X% of a number, percentage change, increase and decrease. Four calculators in one tool.
Percent Change Calculator
Calculate the percentage change between two values. Shows increase or decrease with colour coding, absolute change and the formula used
Percentage Decrease Calculator
Calculate a value after a percentage decrease, or find what percentage decrease goes from one value to another. Two-way calculation with formula
Percentage Difference Calculator
Calculate the percentage difference between two values. Unlike percent change, this is order-independent and uses the average as the base
Percentage Increase Calculator
Calculate a value after a percentage increase, or find what percentage increase goes from one value to another. Two-way calculation with formula
Geometry
3Area Calculator
Calculate the area of rectangles, circles, triangles, trapezoids, ellipses and parallelograms. Shows formula and step-by-step working
Volume Calculator
Calculate the volume of common 3D shapes including cube, sphere, cylinder, cone and pyramid with results in cubic cm, m and litres
Pythagorean Theorem Calculator
Find the missing side of a right triangle or check if three sides form a right triangle. Visual SVG diagram with step-by-step working
Number
3Number to Words Converter
Convert any number to written English words. Supports negatives, decimals, and numbers up to quadrillions. Toggle between UK and US English formats.
Random Number Generator
Generate random numbers, roll dice, flip coins and pick random colours. Bulk generation with configurable ranges and duplicate control
Prime Number Checker
Check if a number is prime, see its factors if composite, and find the next 10 prime numbers with list primes up to N
Volume
2Cubic Feet Calculator
Calculate volume in cubic feet from length, width and height. Supports feet, inches, cm, metres and yards with conversions to litres, gallons and more
Volume Calculator
Calculate the volume of common 3D shapes including cube, sphere, cylinder, cone and pyramid with results in cubic cm, m and litres
Shapes
2Arithmetic
2Fraction Calculator
Add, subtract, multiply and divide fractions with step-by-step working. Shows results as improper fraction, mixed number and decimal
Mixed Numbers Calculator
Add, subtract, multiply and divide mixed numbers and fractions. Convert between mixed numbers, improper fractions and decimals with step-by-step working
Statistics
2Probability Calculator
Calculate probability, combinations (nCr), permutations (nPr) and independent events with formulas and step-by-step working
Standard Deviation Calculator
Calculate mean, median, mode, variance and standard deviation for any dataset. Shows step-by-step working and visual distribution
Increase
2Percent Change Calculator
Calculate the percentage change between two values. Shows increase or decrease with colour coding, absolute change and the formula used
Percentage Increase Calculator
Calculate a value after a percentage increase, or find what percentage increase goes from one value to another. Two-way calculation with formula
Decrease
2Percent Change Calculator
Calculate the percentage change between two values. Shows increase or decrease with colour coding, absolute change and the formula used
Percentage Decrease Calculator
Calculate a value after a percentage decrease, or find what percentage decrease goes from one value to another. Two-way calculation with formula
Multiplication
2Maths Worksheet Generator
Generate printable maths worksheets with addition, subtraction, multiplication, and division. Set difficulty, number range, and question count. Includes answer keys.
Times Tables Practice
Interactive times tables drill with instant feedback and score tracking. Pick your tables, race the clock, and print practice worksheets. Perfect for kids and classrooms.
Factors
2Other
3Quadratic Equation Solver
Solve quadratic equations with step-by-step working showing discriminant calculation and real or complex roots
Screen Size Calculator
Calculate the actual width and height of a screen from its diagonal size and aspect ratio. Useful when buying monitors, TVs, or tablets.
Trigonometry Calculator
Calculate sin, cos, tan, csc, sec and cot for any angle in degrees or radians with visual unit circle indicator