Home › Unit Conversion › Square feet to Square inches
Square feet to Square inches (ft² to in²)
Convert square feet to square inches: 1 ft² = 144 in². Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 ft² = 144 in²
square inches = square feet × 144 — reverse: square feet = square inches × 0.006944444444
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 ft² = 720 in²
- 12.5 ft² = 1800 in²
- 100 ft² = 14400 in²
Square feet to square inches conversion table
| Square feet (ft²) | Square inches (in²) |
|---|---|
| 1 | 144 |
| 2 | 288 |
| 3 | 432 |
| 4 | 576 |
| 5 | 720 |
| 6 | 864 |
| 7 | 1008 |
| 8 | 1152 |
| 9 | 1296 |
| 10 | 1440 |
| 15 | 2160 |
| 20 | 2880 |
| 25 | 3600 |
| 30 | 4320 |
| 40 | 5760 |
| 50 | 7200 |
| 75 | 10800 |
| 100 | 14400 |
| 200 | 28800 |
| 250 | 36000 |
| 500 | 72000 |
| 1000 | 144000 |
FAQ
How many square inches are in one square foot?
1 ft² = 144 in². 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 feet to square inches?
Multiply the value in square feet by 144: square inches = square feet × 144. For example, 5 ft² = 720 in².
How do I convert square inches back to square feet?
Multiply by the inverse factor 0.006944444444 (square feet = square inches × 0.006944444444), or use the square inches-to-square feet page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=ft2&to_unit=in2 - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"ft2","to_unit":"in2"} - Markdown: https://tttkmbb.com/conversion/square-feet-to-square-inches.md · JSON: https://tttkmbb.com/conversion/square-feet-to-square-inches.json (add
?value=for a result) · Units: /api/v1/units?quantity=area - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.