Length and Area
ft²toin²
Convert square feet (ft²) to square inches (in²).
Factor1 ft² = 144 in²
Converter
ft²
Accepts numbers or expressions, e.g. 150 + 14.7
Result
in²
Rendered to 6 significant figures.
Formula
Formula
in² = ft² × 144
Multiply any value in square feet by 144 to obtain the value in square inches.
Worked example
Convert 1 ft² to in².
- 01Start with 1 ft².
- 02Multiply by the conversion factor: 1 × 144 = 144 in².
Result1 ft² = 144 in²
Conversion table
| ft² | in² |
|---|---|
| 1 | 144 |
| 2 | 288 |
| 5 | 720 |
| 10 | 1440 |
| 20 | 2880 |
| 50 | 7200 |
| 100 | 14400 |
| 200 | 28800 |
| 500 | 72000 |
| 1000 | 1.4400e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from ft² to in²?
1 ft² equals 144 in². To convert, multiply the value in square feet by 144.
How do I convert 1 ft² to in²?
1 ft² = 144 in². For any value, multiply by 144.
How do I convert in² back to ft²?
Divide by the same factor — or equivalently, multiply by 0.006944444. So 1 in² = 0.00694444 ft².
When would I need to convert square foot to square inch?
Area conversions are common in heat-exchanger surface area, site layout, and land-use planning where imperial and metric conventions mix.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).