Square Footage Calculator

Shape

Length or base

Width or height

Input units

Result

Square metres17.5
Square feet188.37
Square yards20.93
Hectares0.00175
Acres0.00432
In the units entered17.5

Metres in, feet out, or the other way round

Area of a rectangle, triangle or circle given straight away in square metres, square feet, square yards, hectares and acres.

It looks like a school exercise right up to the moment the plan is metric, the listing is in feet and the land is measured in hectares. Enter dimensions in either unit and the area comes back in all of them.

Three shapes cover nearly everything: rectangles for rooms and plots, triangles for corner pieces, circles for beds, pools and turning areas. Anything more complicated splits into these and adds up.

What this calculator shows

Area in square metres and square feet
Square yards, hectares and acres for land
The value in whichever unit you entered

What to keep in mind

A square foot is exactly 0.09290304 m² under the 1959 international agreement.
A hectare is exactly 10,000 m²; an acre is 4,046.86 m².

FAQs

How do I convert square feet to square metres?

Divide by 10.764. A 1,000 square foot apartment is about 93 square metres.

How big is an acre?

About 4,047 square metres, roughly 43,560 square feet. A hectare is 10,000 m², so it holds just under two and a half acres.

How do I measure an irregular room?

Split it into rectangles and triangles, calculate each and add. For a curved bay, add a segment of a circle.

Which shape should I use for a plot?

Rectangle for most, triangle for a corner. For a four-sided plot with no right angles, split it along a diagonal into two triangles.

Worked example

A room in metres

Input: 5 × 3.5 m, rectangle

Output: 17.5 m² or 188.4 sq ft

Note: That is 0.00432 acres — meaningless for a room, and exactly the right unit for a building plot.

Useful links

All tools in Building & Repair

Square Footage Calculator

Result

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