Square Inches to Square Feet
An instant square inches-to-square feet converter, with the formula and a reference table below.
| Square Inches | Square Feet |
|---|---|
| 1 in² | 0.006944 ft² |
| 2 in² | 0.013889 ft² |
| 3 in² | 0.020833 ft² |
| 5 in² | 0.034722 ft² |
| 10 in² | 0.069444 ft² |
| 25 in² | 0.173611 ft² |
| 50 in² | 0.347222 ft² |
| 100 in² | 0.694444 ft² |
How to use
- Enter a value in the Square Inches field.
- The Square Feet figure appears immediately — no button to press.
- Typing in the Square Feet field converts back to Square Inches the same way.
- Use the reference table for the values that come up most often.
Square Inches to Square Feet formula
To convert square inches to square feet, multiply by 0.00694444444.
ft² = in² × 0.00694444444
Put another way, one square inch is exactly 1/144 of a square foot.
Why this factor: the square inch and the square foot are both defined against the square meter, so dividing one definition by the other gives 0.00694444444 directly. Both definitions are set out in full below.
To go the other way, divide by 0.00694444444 — or use the Square Feet to Square Inches converter, which is the same calculation reversed.
Worked example
Take 1000 in² and multiply by the factor 0.00694444444: the result is 6.944444 ft².
1000 in² × 0.00694444444 = 6.944444 ft²
The converter above does this for any value you type, in either direction.
What is a square inch?
A square inch is the area of a one-inch square, used for small areas and pressure.
Definition: Exactly 0.00064516 square meter, following from the exact 25.4 mm inch.
Where it is used: Print and label areas, gasket and seal faces, and the denominator in psi.
What is a square foot?
A square foot is the primary unit of floor area in the United States.
Definition: Exactly 0.09290304 square meter, following from the exact 0.3048 m foot.
Where it is used: US and Indian property listings, commercial leases, and paint and flooring coverage.
Square Inches vs Square Feet
The square inch and the square foot belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many square feet are in a square inch?
One square inch equals 0.00694444444 square feet.
What is the formula to convert square inches to square feet?
Multiply the number of square inches by 0.00694444444. To reverse it, divide by 0.00694444444 instead.
How do I convert square feet back to square inches?
Divide by 0.00694444444, which is the same as multiplying by 144.
How many square feet are in 10 square inches?
10 in² works out to 0.069444 ft².
How is the square inch defined?
Exactly 0.00064516 square meter, following from the exact 25.4 mm inch.