Square Feet to Square Inches
An instant square feet-to-square inches converter, with the formula and a reference table below.
| Square Feet | Square Inches |
|---|---|
| 1 ft² | 144 in² |
| 2 ft² | 288 in² |
| 3 ft² | 432 in² |
| 5 ft² | 720 in² |
| 10 ft² | 1440 in² |
| 25 ft² | 3600 in² |
| 50 ft² | 7200 in² |
| 100 ft² | 14400 in² |
How to use
- Enter a value in the Square Feet field.
- The Square Inches figure appears immediately — no button to press.
- Typing in the Square Inches field converts back to Square Feet the same way.
- Use the reference table for the values that come up most often.
Square Feet to Square Inches formula
Converting square feet to square inches is a single multiplication by 144.
in² = ft² × 144
Put another way, one square foot is exactly 144 square inches.
Why this factor: the square foot and the square inch are both defined against the square meter, so dividing one definition by the other gives 144 directly. Both definitions are set out in full below.
To go the other way, divide by 144 — or use the Square Inches to Square Feet converter, which is the same calculation reversed.
Worked example
Given 250 ft², multiplying by 144 yields 36000 in².
250 ft² × 144 = 36000 in²
The converter above does this for any value you type, in either direction.
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.
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.
Square Feet vs Square Inches
The square foot and the square inch 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 inches are in a square foot?
One square foot equals 144 square inches.
What is the formula to convert square feet to square inches?
Multiply the number of square feet by 144. To reverse it, divide by 144 instead.
How do I convert square inches back to square feet?
Divide by 144, which is the same as multiplying by 0.00694444444.
How many square inches are in 10 square feet?
10 ft² works out to 1440 in².
How is the square foot defined?
Exactly 0.09290304 square meter, following from the exact 0.3048 m foot.