Square Feet to Square Inches Converter
One Square Foot equals 144 Square Inches (1 ft2 = 144 in2). Multiply a Square Foot value by 144 to get the equivalent in Square Inches. Enter a value above to calculate the result. You can also use the formula and reference table below.
Formula
in2 = ft2 × 144
Multiply the Square Foot value by 144 to get the equivalent value in Square Inches.
Example Conversions
1 Square Foot (ft2)
144 Square Inch (in2)
5 Square Foot (ft2)
720 Square Inch (in2)
10 Square Foot (ft2)
1440 Square Inch (in2)
25 Square Foot (ft2)
3600 Square Inch (in2)
100 Square Foot (ft2)
14400 Square Inch (in2)
Conversion Table
| Square Foot (ft2) | Square Inch (in2) |
|---|---|
| 0.1 | 14.4 |
| 0.5 | 72 |
| 1 | 144 |
| 2 | 288 |
| 5 | 720 |
| 10 | 1440 |
| 25 | 3600 |
| 50 | 7200 |
| 100 | 14400 |
| 250 | 36000 |
| 500 | 72000 |
| 1000 | 144000 |
How to Convert Manually
Use these steps to convert Square Foot values to Square Inch without the calculator.
- Write down the value in Square Foot (ft2) that you want to convert.
- Multiply that value by 144.
- For example, 10 Square Feet × 144 = 1440 Square Inches.
- Label the result as Square Inch (in2).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Square Foot and one Square Inch.
About Square Foot and Square Inch
The square foot is exactly 0.09290304 square meters. It is the standard unit of US and UK real estate; home sizes, office leases, and rents are quoted per square foot. The square inch is exactly 6.4516 square centimeters. Pressure ratings (psi), screen areas, and small US manufacturing specs use it. One Square Foot equals 144 Square Inches (1 ft2 = 144 in2). Square Foot is used in US home and office sizes and in commercial lease rates. Square Inch is used in pressure specifications (pounds per square inch).
Precision and Rounding:Area factors are the squares of exact length factors, so they are exact too (1 ft² = 0.09290304 m² precisely). Whole numbers usually suffice for rooms and land parcels; surveying and legal land descriptions carry four or more decimal places.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Square Feet equals2160Square Inches.
15 ft2 × 144 = 2160 in2
FAQ
How do I convert Square Foot to Square Inch?
Multiply the Square Foot value by 144 to get the equivalent value in Square Inches.
What is the formula for Square Foot to Square Inch?
The formula is in2 = ft2 × 144.
How many Square Inches are in 1 Square Foot?
1 Square Foot equals 144 Square Inches.
Can I convert Square Inch back to Square Foot?
Yes. 1 Square Inch equals 0.006944444444 Square Feet, and the related converter can reverse the calculation.
What are common names for Square Foot and Square Inch?
Square Foot is shown as ft2 and may also be searched as square feet, sq ft, ft². Square Inch is shown as in2 and may also be searched as square inches, sq in, in².
Was this page helpful?
Let us know if this converter met your needs.