Area Calculator

How area is calculated

Pick a shape, enter its dimensions in any length unit, and the calculator applies the standard geometry formula, converts the result to square meters, and then to whichever area unit you want — from square centimeters to acres and hectares.

Formulas

Rectangle: A = length × width

Square: A = side²

Circle: A = π × radius²

Triangle: A = base × height ÷ 2

Trapezoid: A = (base₁ + base₂) ÷ 2 × height

Ellipse: A = π × radius₁ × radius₂

Worked examples

• Room 12 m × 8 m — 96 m², which is about 1,033 sq ft.
• Circle with 5 m radius — π × 25 ≈ 78.54 m².
• Triangle, base 10 m, height 6 m — 10 × 6 ÷ 2 = 30 m².
• Plot 50 m × 80 m in acres — 4,000 m² ÷ 4,046.86 ≈ 0.99 acre.

Everyday reasons to measure area

• Flooring and tiling — how many square metres of laminate, carpet, or tile a room needs.
• Paint — wall area divided by a tin's coverage (often 10–12 m² per litre) tells you how much to buy.
• Land and gardens — the size of a plot, lawn, or patio in square metres, acres, or hectares.
• Fabric and materials — estimating sheet goods, turf, or wallpaper for a project.

Handling irregular shapes and waste

A space that is not a neat rectangle can usually be split into simpler shapes — rectangles, triangles, and circle segments — measured separately and added together. Subtract openings like doorways or a kitchen island from the total. For materials sold in whole units, add 5–10% for cutting waste and offcuts so you are not left short partway through the job.

For three-dimensional shapes — tanks, boxes, pools — use the volume calculator; for plain unit-to-unit area conversion, the unit converter.