AREA CALCULATOR (SHAPES)
Rectangle, triangle, circle, parallelogram and trapezium area formulas
Enter dimensions and get clear GCSE-style working on screen
SHAPE
RECT
Choose the shape first
ROUNDING
2DP
Result rounding only
LENGTH
A
Enter a number
WIDTH
B
Enter a number
WORKING
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AREA
READY
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PAGE SUMMARY
Use this calculator to work out the area of common 2D shapes.
Good for rectangle, triangle, circle, parallelogram and trapezium questions.
Useful for school maths, GCSE revision, homework checks and formula practice.
Area units are squared, for example cm², m² or mm².
See formulas, examples and extra shape help on the next pages.
Related maths pages are linked below for HCF, perimeter, index and tool index browsing.
HOW TO USE
Choose a shape, enter the dimensions shown and press SOLVE.
Only the measurements needed for that shape are shown.
The answer uses squared units such as cm² or m².
RECTANGLE
Area = length × width
A = L × W
Example: 8 × 5 = 40
TRIANGLE
Area = ½ × base × height
A = (B × H) ÷ 2
Example: (10 × 6) ÷ 2 = 30
CIRCLE
Area = πr²
Use the radius, not the diameter
Example: r = 4 gives π × 16 ≈ 50.27
PARALLELOGRAM
Area = base × perpendicular height
The sloping side is not used for area.
Example: 9 × 3 = 27
TRAPEZIUM
Area = ½(a + b)h
a and b are the parallel sides.
Example: ½(6 + 10) × 4 = 32
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AREA CALCULATOR FOR SHAPES
This page helps you calculate the area of common flat shapes quickly.
It suits learners checking formulas for rectangles, triangles, circles and trapeziums.
It is also useful for school maths and GCSE area questions.
GCSE AREA REVISION
Area formulas come up in revision, homework and exam practice.
This page shows the substitution step so you can see how the answer is built.
COMMON SEARCHES
area calculator rectangle and triangle
circle area calculator with working
trapezium area formula calculator
GCSE area formulas for shapes
UNITS
If the lengths are in centimetres, the area is in square centimetres.
If the lengths are in metres, the area is in square metres.
Always remember the squared unit symbol.
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WORKED EXAMPLES
Rectangle: 12 × 4 = 48
Triangle: (7 × 8) ÷ 2 = 28
Circle: π × 3² ≈ 28.27
Trapezium: ½(5 + 9) × 6 = 42
WHY THIS PAGE HELPS
It gives a quick answer and a clear method.
It helps users compare different area formulas in one place.
It also improves confidence before moving on to perimeter, volume or algebra pages.
RELATED TELEtext-TOOLS PAGES
LOOP BACK
Use NEXT to return to Page 1 and keep calculating.
This keeps the calculator clear on the first page while still giving strong extra help.
PAGE 4/4
SHAPE
RECT
Choose the shape first
ROUNDING
2DP
Result rounding only
LENGTH
A
Enter a number
WIDTH
B
Enter a number
PAGE 1/4
WORKING
—
—
—
—
—
AREA
READY
—
PAGE 2/4
HOW TO USE
Choose a shape, enter the dimensions shown and press SOLVE.
Area answers use square units.
RECTANGLE / TRIANGLE
Rectangle: A = L × W
Triangle: A = (B × H) ÷ 2
CIRCLE
A = πr²
Enter the radius.
PARALLELOGRAM
A = base × height
TRAPEZIUM
A = ½(a + b)h
EXAMPLES
8 × 5 = 40
½(6 + 10) × 4 = 32
π × 4² ≈ 50.27
PAGE 3/4
AREA OF SHAPES
This page helps calculate the area of common 2D shapes.
It is useful for rectangle, triangle, circle and trapezium questions.
Good for school maths and GCSE revision.
WORKED VALUES
Rectangle: 12 × 4 = 48
Triangle: (7 × 8) ÷ 2 = 28
Circle: π × 3² ≈ 28.27
Trapezium: ½(5 + 9) × 6 = 42
PAGE 4/4