Home › Unit Conversion › Square inches to Square feet
Square inches to Square feet (in² to ft²)
Convert square inches to square feet: 1 in² = 0.00694444 ft². Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 in² = 0.00694444 ft²
square feet = square inches × 0.006944444444 — reverse: square inches = square feet × 144
The factor is derived from the SI definitions of both units (base unit: m2) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 in² = 0.0347222 ft²
- 12.5 in² = 0.0868056 ft²
- 100 in² = 0.694444 ft²
Square inches to square feet conversion table
| Square inches (in²) | Square feet (ft²) |
|---|---|
| 1 | 0.00694444 |
| 2 | 0.0138889 |
| 3 | 0.0208333 |
| 4 | 0.0277778 |
| 5 | 0.0347222 |
| 6 | 0.0416667 |
| 7 | 0.0486111 |
| 8 | 0.0555556 |
| 9 | 0.0625 |
| 10 | 0.0694444 |
| 15 | 0.104167 |
| 20 | 0.138889 |
| 25 | 0.173611 |
| 30 | 0.208333 |
| 40 | 0.277778 |
| 50 | 0.347222 |
| 75 | 0.520833 |
| 100 | 0.694444 |
| 200 | 1.38889 |
| 250 | 1.73611 |
| 500 | 3.47222 |
| 1000 | 6.94444 |
FAQ
How many square feet are in one square inch?
1 in² = 0.00694444 ft². The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert square inches to square feet?
Multiply the value in square inches by 0.006944444444: square feet = square inches × 0.006944444444. For example, 5 in² = 0.0347222 ft².
How do I convert square feet back to square inches?
Multiply by the inverse factor 144 (square inches = square feet × 144), or use the square feet-to-square inches page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=in2&to_unit=ft2 - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"in2","to_unit":"ft2"} - Markdown: https://tttkmbb.com/conversion/square-inches-to-square-feet.md · JSON: https://tttkmbb.com/conversion/square-inches-to-square-feet.json (add
?value=for a result) · Units: /api/v1/units?quantity=area - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.