A square foot is 12 × 12 = 144 square inches. Tile, glass and sheet-metal quotes often need this conversion.
How to use the Square Inches to Square Feet Converter
- Type the number of square inches into the Square inches field. Decimals such as 72 are fine.
- Read the answer in Square feet – it updates as you type, with no button to press.
- To convert the other way, type into Square feet and the square inches are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only in² ⇄ ft². Need a different unit? Use the general area converter, where you can choose any “from” and “to” unit.
How it works
Both units measure area, so they are always in the same ratio: one square inch equals 0.0069444444 square feet. The calculator multiplies the number of square inches you type by 0.0069444444 to give square feet, and when you type into the square feet field it divides by the same factor to give square inches. Because the ratio never changes, doubling the square inches always doubles the square feet. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert square inches to square feet
- Write down the value in square inches, for example 144 in².
- Multiply by the conversion factor 0.0069444444 (because 1 square inch = 0.0069444444 ft²).
- 144 × 0.0069444444 = 1 ft².
- To go back from square feet to square inches, divide by 0.0069444444 – or multiply by 144.
in² to ft² conversion table
| Square inches | Square feet | Square feet | Square inches |
|---|---|---|---|
| 1 in² | 0.0069444444 ft² | 1 ft² | 144 in² |
| 36 in² | 0.25 ft² | 2 ft² | 288 in² |
| 72 in² | 0.5 ft² | 5 ft² | 720 in² |
| 144 in² | 1 ft² | 10 ft² | 1,440 in² |
| 288 in² | 2 ft² | 20 ft² | 2,880 in² |
| 576 in² | 4 ft² | 50 ft² | 7,200 in² |
| 1,000 in² | 6.9444444 ft² | 100 ft² | 14,400 in² |
| 1,296 in² | 9 ft² | 1,000 ft² | 144,000 in² |
What is a square inch?
A square inch is a square 1 in on each side, exactly 6.4516 cm². It appears in tile, glass and sheet-metal quotes and in pressure units such as pounds per square inch.
What is a square foot?
The square foot is a square 1 ft on each side, exactly 0.09290304 m². U.S., Canadian, UK and South Asian property listings quote floor space in square feet.
Quick mental conversion
For a fast estimate, multiply square inches by about 0.0069 to get square feet; the error is about 0.6%. Use the calculator above when you need the exact figure.
Common mistakes to avoid
Converting area with a length factor (1 m = 3.28 ft, but 1 m² = 10.76 ft², not 3.28 ft²), and assuming regional land units such as marla, bigha or katha have one standard size everywhere.
Formula
1 in² = 0.0069444444 ft²1 ft² = 144 in²ft² = in² × 0.0069444444Worked example
Inputs — Square inches: 144 in².
Results — Square feet = 1 ft².
Frequently asked questions
How many square inches in a square foot?
144.
How many ft² is a 24 × 24 in tile?
4 ft².
How do I convert square inches to square feet?
Multiply the number of square inches by 0.0069444444. For example, 144 in² × 0.0069444444 = 1 ft².
How do I convert square feet back to square inches?
Divide by 0.0069444444 (or multiply by 144), or simply type the value into the square feet field above.
What is 1,000 in² in square feet?
1,000 in² = 6.9444444 ft².
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between square inches and square feet. To pick any area unit, use the general area converter linked under Related calculators.
What formula does the Square Inches to Square Feet Converter use?
1 in² = 0.0069444444 ft².