Area Calculator: Area in Square Feet, Square Metres, Cents and Acres

Choose a shape, enter its dimensions in feet, metres, inches or centimetres, and get the area in all the units used for plots, rooms and land.

FreeNo sign-upRuns in your browserUpdated 2 Nov 2026
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Estimates only. Check important results before you rely on them.

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How to use this calculator

  1. Pick the shape.
  2. Choose the unit your measurements are in.
  3. Enter the dimensions that appear.
  4. Read the area in sq ft, sq m, sq yards, cents and acres.

The formula

Rectangle = Length × Width. Triangle = ½ × Base × Height. Circle = π × Radius². Trapezoid = ½ × (a + b) × Height. Parallelogram = Base × Height. 1 cent = 435.56 sq ft. 1 acre = 43,560 sq ft = 100 cents.

Worked example

A rectangle 20 ft × 15 ft is 300 sq ft, which is 27.871 m² or 0.6887 cent. A circle with a 3 m radius covers 28.274 m², which is 304.34 sq ft.

Understanding your result

For an odd-shaped plot, split it into rectangles and triangles, find each area and add them. The perimeter line helps with fencing and edging.

When to use it

  • Measure a room, plot or farm field.
  • Find the quantity of paint, tiles or flooring needed.
  • Convert between sq ft, cents and acres for property.

Assumptions and limits

These are planning estimates. Real use depends on material quality, site conditions and workmanship. Confirm quantities with your engineer or contractor before ordering. For legal land records, use the survey measurements and the units in the title deed. A cent is taken as 1/100 acre.

Frequently asked questions

How do I calculate the area of a plot in sq ft?

Multiply length by width for a rectangular plot, both in feet.

How many sq ft are in a cent?

One cent is about 435.56 sq ft.

How many cents are in an acre?

One acre is 100 cents, which is 43,560 sq ft.

What is the area of a circle?

π times the radius squared.

How do I find the area of an irregular shape?

Break it into simple shapes, calculate each area and add them together.