Square Foot to Square Inch Converter
Convert Square Foot (ft²) to Square Inch (in²) instantly. 1 ft² = 144 in².
Area Converter
20 units available
1 ft² = 144 in²
Formula:
in² = ft² × 144With your value: 1 ft² = 144 in²
How big is that?
Everyday references on a logarithmic scale, all expressed in square foot so you can sanity-check the result.
Other Square Foot to Square Inch conversions
Square Foot to Square Inch Conversion Table
| Square Foot (ft²) | Square Inch (in²) |
|---|---|
| 0.5 | 72 |
| 1 | 144 |
| 2 | 288 |
| 5 | 720 |
| 10 | 1,440 |
| 15 | 2,160 |
| 20 | 2,880 |
| 25 | 3,600 |
| 50 | 7,200 |
| 100 | 14,400 |
| 250 | 36,000 |
| 500 | 72,000 |
| 1000 | 144,000 |
Square Inch to Square Foot Conversion Table
| Square Inch (in²) | Square Foot (ft²) |
|---|---|
| 0.5 | 0.003472 |
| 1 | 0.006944 |
| 2 | 0.013889 |
| 5 | 0.034722 |
| 10 | 0.069444 |
| 15 | 0.104167 |
| 20 | 0.138889 |
| 25 | 0.173611 |
| 50 | 0.347222 |
| 100 | 0.694444 |
| 250 | 1.736111 |
| 500 | 3.472222 |
| 1000 | 6.944444 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Square Foot (ft²)
Area
Derived from the square metre via the length definitions above.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Square Inch (in²)
Area
Derived from the square metre via the length definitions above.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Square Foot to Square Inch
To convert from Square Foot (ft²) to Square Inch (in²), multiply the value by 144.
Formula: in² = ft² × 144
Reverse: ft² = in² × 0.0069444444
Step-by-Step Example
- Start with your value in Square Foot. For example: 5 ft²
- Multiply by the conversion factor: 5 x 144
- The result is: 720 in²
About Square Foot
The square foot is an imperial unit of area equal to a square with sides of 1 foot. It is the standard unit for real estate in the US.
Common uses: real estate (US), flooring, construction.
About Square Inch
The square inch (in²) is a unit of area. One square inch equals 0.00064516 square metres. UnitConvertLab converts it against every other area unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: area calculations, engineering and science, education.
Frequently Asked Questions
How many Square Inch are in 1 Square Foot?
There are exactly 144 Square Inch in 1 Square Foot. This means the conversion factor from Square Foot to Square Inch is 144.
What is the formula to convert Square Foot to Square Inch?
The formula to convert Square Foot to Square Inch is: in² = ft² × 144. For example, to convert 10 Square Foot to Square Inch, you would multiply 10 by 144.
What is a Square Foot?
The square foot is an imperial unit of area equal to a square with sides of 1 foot. It is the standard unit for real estate in the US.
What is a Square Inch?
The square inch (in²) is a unit of area. One square inch equals 0.00064516 square metres. UnitConvertLab converts it against every other area unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Square Foot?
The Square Foot is commonly used in real estate (US), flooring, construction.
Related Area Conversions
Cite this page
UnitConvertLab. (2026). Square Foot to Square Inch converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/sqfoot-to-sqinch