AREA CALCULATOR
CHOOSE SHAPE • ENTER DIMENSIONS • QUICK ANSWER
SHAPE + DIMENSIONS
Rectangle area: 8 × 5.
NEXT shows formula and full working.
FULL WORKING
FORMULA • SUBSTITUTION • SQUARE UNITS
Use PREVIOUS to return to the input screen.
Formula appears here.
Use INFO for formulas and help pages.
AREA FORMULAS
RECTANGLE • TRIANGLE • CIRCLE • TRAPEZIUM
Rectangle: A = length × width.
Triangle: A = ½ × base × height.
Circle: A = πr².
Trapezium: A = ½(a + b)h.
WHAT THIS TOOL DOES
CALCULATE AREA OF COMMON 2D SHAPES
This calculator finds the inside space of common 2D shapes.
It supports rectangles, triangles, circles, parallelograms and trapeziums.
The page shows the formula, substituted values and final answer.
Area answers use square units, such as cm² or m².
HOW TO USE
CHOOSE SHAPE • ENTER DIMENSIONS • SOLVE
Choose the shape first, then enter the dimensions shown.
For a circle, enter the radius.
For a trapezium, enter both parallel sides and the perpendicular height.
Choose rounding, then press SOLVE or Enter.
WORKED EXAMPLES
COMMON AREA CALCULATIONS
Rectangle: 12 × 4 = 48.
Triangle: (7 × 8) ÷ 2 = 28.
Circle: π × 3² ≈ 28.27.
Trapezium: ½(5 + 9) × 6 = 42.
UNITS
AREA USES SQUARE UNITS
Lengths in centimetres give an answer in square centimetres.
Lengths in metres give an answer in square metres.
Use the same length unit for every dimension in the calculation.
Area is always written in squared units.
COMMON SEARCHES
SEARCH INTENT COVERAGE
POPULAR AREA SEARCHES
Area calculator for shapes
Rectangle area calculator
Triangle area calculator with working
Circle area calculator radius
MORE SEARCHES
Trapezium area formula calculator
Parallelogram area calculator
GCSE area formulas
Area with working
WHO USES IT
STUDENTS • TEACHERS • PARENTS
Students use it for GCSE area questions and KS2 or KS3 homework.
Teachers use it to check examples and show formula substitution.
Tutors use it for shape formula revision.
Parents can support rectangle, triangle, circle and trapezium homework.
COMMON USE CASES
SCHOOL • REVISION • REAL MEASUREMENTS
Use it for homework, revision and exam practice.
Use it to check room estimates, garden areas and craft shapes.
Use it when comparing rectangle, triangle and circle formulas.
The working panel keeps the formula visible with the answer.
RELATED PAGES
GEOMETRY AND SHAPE TOOLS
Area is part of the Teletext geometry calculators section.
FAQ
AREA CALCULATOR QUESTIONS
What units does it use? Any length unit; answer is square units.
Does circle area need diameter? This tool uses radius.
What is trapezium height? The perpendicular distance.
Can it show working? Yes, Screen 1 shows formula and substitution.
SEARCH TERMS
WAYS PEOPLE FIND THIS TOOL