Area / ft² → in²
Convert Square feet to Square inches
Convert surface areas in metric and international customary units. Convert Square feet (ft²) to Square inches (in²). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Square inches to Square feet →
How to convert square feet to square inches
Area factors are squared length factors. Acres here use international feet, not historical US survey feet.
Use x for the value in ft², b for the intermediate value in m², and y for the result in in².
in² = ft² × 0.09290304 ÷ 0.00064516
Worked examples
10 ft² ≈ 1440 in²
Step 1: (10 × 0.09290304) ≈ 0.9290304 m².
Step 2: 0.9290304 ÷ 0.00064516 ≈ 1440 in².20 ft² ≈ 2880 in²
Step 1: (20 × 0.09290304) ≈ 1.8580608 m².
Step 2: 1.8580608 ÷ 0.00064516 ≈ 2880 in².
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Square feet
Square feet (ft²) measures area under the conventions above. The base value in m² is (x × 0.09290304), where x is the numerical value in ft². Factors shown here are rounded for display; calculations use the stored factor.
About Square inches
Square inches (in²) measures area under the conventions above. The base value in m² is (x × 0.00064516), where x is the numerical value in in². Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Keep these unit conventions consistent when using measurements in construction calculations.
Square feet to square inches reference table
| Square feet (ft²) | Square inches (in²) |
|---|---|
| 1 | 144 |
| 5 | 720 |
| 10 | 1440 |
| 25 | 3600 |
| 50 | 7200 |
| 100 | 14400 |
| 1000 | 144000 |
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