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Square Foot to Square Inch Converter

Instant, two-way conversion across common engineering units.

Free

1 ft² = 144 in²(Square foot → Square inch)

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Converting square feet to square inches

To convert square feet to square inches, multiply the value by 144. Area figures drive floor space schedules, finish quantities and cost per area, so both metric and imperial results are shown at full precision.

Visual scale

To scale
1 square foot = 144 square inches.
1 square inch = 0.0069444444 square feet.

Square Foot (ft²)

The square foot (ft²) is the standard floor area unit in US and partly UK real estate and construction.

Origin
The area of a square with 1 ft sides, based on the 0.3048 m international foot.
Where it is used
Used for leasable area, rents, cost per area and finish quantities.
Relation to SI
1 ft² = 0.09290304 m² exactly, so 1 m² is about 10.764 ft².

Square Inch (in²)

The square inch (in²) is the small area unit of US customary practice.

Origin
Derived from the internationally defined inch of exactly 25.4 mm.
Where it is used
Used for bearing areas, fastener and section properties and pressure calculations in psi.
Relation to SI
1 in² = 0.00064516 m² exactly.

Frequently asked questions

How many square inches are in one square foot?

1 ft² equals 144 in².

How do I convert square feet to square inches?

Multiply the value by 144. For example, 10 ft² equals 1,440 in².

How do I convert back from square inches to square feet?

1 in² equals 0.0069444444 ft². The converter above works in both directions, so you can type into either field.

When should I use hectares instead of acres?

Hectares are the metric standard for site and land areas in most planning systems, while acres remain common in US and UK land records. Use whichever the local authority requires and quote the other in brackets.

How do I convert a length ratio into an area ratio?

Square the length factor. Because 1 ft = 0.3048 m, one square foot is 0.3048², which is 0.09290304 m².

Is this area converter free to use?

Yes. Every unit conversion runs in your browser, needs no account and is free for professional use.

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