Math Calculators

Arithmetic Calculator

Step-by-step addition, subtraction, multiplication and division — column method with carrying and borrowing shown

Percentage Calculator

% of a number, percentage change, reverse percentage, VAT

Fraction Calculator

Add, subtract, multiply and divide fractions with full working

Simplify Fractions

Reduce any fraction to its lowest terms instantly

Fraction to Decimal

Convert any fraction to a decimal with step-by-step working

Equation Solver

Solve linear equations — shows every step of the working

Quadratic Formula

Solve ax² + bx + c = 0 using the quadratic formula

Simultaneous Equations

Solve two equations with two unknowns

Area Calculator

Area of circles, rectangles, triangles, trapezoids and more

Pythagoras Calculator

Find any side of a right-angled triangle

Trigonometry Calculator

Sin, cos, tan — find missing sides and angles

HCF & LCM Calculator

Highest common factor and lowest common multiple — with prime factorisation

Mean, Median & Mode

Calculate all averages and the range from any data set

Ratio Calculator

Simplify ratios and share amounts in a given ratio

Rounding Calculator

Round to decimal places, significant figures or the nearest integer

Standard Form Calculator

Convert between ordinary numbers and standard form (scientific notation)

Number Names

Type any number and see it named in Western (million/billion/trillion) and Indian (lakh/crore/arab) systems — with scientific notation.

Powers & Roots

Calculate any power or root — squares, cubes, nth roots

Golden Ratio

Calculate golden ratio sections, golden rectangles and explore the Fibonacci connection

BODMAS Calculator

Step-by-step Order of Operations — BODMAS / PEMDAS evaluation with full working

Negative Numbers

Add, subtract, multiply and divide negative numbers — with rules explained

Decimal Calculator

Add, subtract, multiply and divide decimals with column method working

Equivalent Fractions

Find equivalent fractions and check if two fractions are equal — step-by-step

Mixed Number Calculator

Add, subtract, multiply and divide mixed numbers and improper fractions

Percentage Change

Calculate percentage increase or decrease between two values — with working

Percentage of a Number

Find what X% of Y is — explained step by step

Reverse Percentage

Work backwards from a percentage result to find the original value

Nth Term Calculator

Find the nth term rule for arithmetic, geometric and quadratic sequences

Perimeter Calculator

Perimeter of triangles, quadrilaterals, circles and regular polygons — with working

Volume Calculator

Volume of cuboids, cylinders, spheres, cones and pyramids — step-by-step

Direct Proportion

Solve direct and inverse proportion problems — find k and missing values

Factors Calculator

Find every factor, factor pair and prime factorisation of any whole number

Range & IQR Calculator

Calculate the range, quartiles, IQR and draw a box-and-whisker plot

Probability Calculator

Single event, combined AND/OR probability and relative frequency — with working

Sine Rule Calculator

Find missing sides or angles in any triangle using the sine rule — ambiguous case included

Cosine Rule Calculator

Find a missing side (SAS) or all angles (SSS) using the cosine rule — step-by-step

Number Base Converter

Convert between binary, octal, decimal and hexadecimal — with step-by-step working

Speed, Distance & Time

Find speed, distance or time — uses the SDT triangle method

RGB & HEX Converter

Convert colours between RGB, HEX and HSL — great for designers and developers

Ohm's Law Calculator

Calculate voltage, current or resistance — V = IR solved three ways

Aspect Ratio Calculator

Find dimensions, scale or simplify ratios for photos, video and print

Data Storage Converter

Convert between bits, bytes, KB, MB, GB and TB

Decimal to Fraction

Convert any decimal to a fraction in its simplest form — including recurring decimals

Fraction to Decimal

Convert any fraction to a decimal — shows the long division working

Percentage to Fraction

Convert any percentage to a simplified fraction

Temperature Converter

Convert between Celsius, Fahrenheit and Kelvin

Length Converter

Convert between metric and imperial — mm, cm, m, km, in, ft, mi

Weight Converter

Convert between kg, g, lb, oz, stone and more

Area Converter

Convert between m², cm², km², ft², acres and hectares

Speed Converter

Convert between mph, km/h, m/s and knots

Volume Converter

ml, litres, UK pints, US cups, gallons and more — including the UK vs US pint difference.

Time Converter

Convert seconds, minutes, hours, days, weeks, months and years — with human-readable breakdown.

Angle Converter

Convert degrees, radians and gradians — with angle-type classifier and π notation.

Power Converter

Watts, kW, horsepower and BTU/hr — plus running cost calculator for any appliance.

Force Converter

Newtons, kilonewtons, pound-force and kilogram-force — plus planet weight calculator.

Acceleration Converter

Convert m/s², g-force and mph/s — with 0-60 mph calculator and g-force experience guide.

Pressure Converter

PSI, bar, Pascal, mmHg and atm — with tyre pressure guide, weather reference and blood pressure context.

Bills & Tipping

Split any bill, add a service charge and calculate tips for any group

Deals & Discounts

Work out % off, BOGOF, buy 2 get 1 free, cheapest free and multi-buy deals

Tax & Charges

Add or remove VAT, GST or any tax — plus find a rate from net and gross

Memberships & Subscriptions

Find the cost per use of any membership and compare monthly vs annual plans

True Cost Calculator

Add up the headline price plus every extra and fee to find what something really costs

Currency & Holiday Money

See exactly what you get when you exchange — and how much the rate and commission cost

Simple Interest

Calculate interest earned or owed — or find the rate or time — with full working

Compound Interest

See how money grows year by year with compound interest and compare to simple interest

Credit Card Calculator

Find out how long to clear a balance and how much the minimum payment trap really costs

Trip & Travel

Build the full cost of any trip and compare driving vs public transport

Target Number Solver

Hit any 3-digit target from 6 numbers using basic arithmetic (+, −, ×, ÷) — Countdown style

Next Number in Sequence

Find missing numbers, difference tables, and formulas for aptitude test sequences and puzzles

Invoice & Deposit Matcher

Find which combination of invoices or receipts adds up to a lump sum bank deposit

Times Tables ×

Interactive times tables 1–12 — browse any table, quiz mode with scoring and streak, tricks for every table.

Division Facts ÷

Practice division facts 1–12 — each answer shows the multiplication it comes from, so you learn both at once.

Multiplication Grid

Full multiplication grid from 1×1 to 12×12

Addition Grid

Interactive 1-12 addition grid — highlight number bonds to 10 and 20, doubles and teen numbers. Perfect for KS1.

Trig Ratios Table

Exact values for sin, cos and tan — interactive unit circle, angle calculator and memory tricks. secondary school-ready.

Roman Numerals

Bidirectional converter with colour-coded breakdown, live Roman clock, 1–100 grid and famous uses — Super Bowl, film dates, royalty.

Number Names & Words

Type any number and see it named in Western (million/billion/trillion) and Indian (lakh/crore/arab) systems — with scientific notation.

Prime Numbers

Instant primality checker with factorisation, interactive Sieve of Eratosthenes and the first 1,000 primes.

Formula Sheets

Printable formula reference sheets — one per topic. Algebra, geometry, trigonometry and more.

Times Tables Chart

Printable 12×12 times table grid — perfect for classroom walls and homework folders.