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Square feet to Acres (ft² to acre)
Convert square feet to acres: 1 ft² = 0.0000229568 acre. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 ft² = 0.0000229568 acre
acres = square feet × 0.00002295684114 — reverse: square feet = acres × 43560
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 = 0.000114784 acre
- 12.5 ft² = 0.000286961 acre
- 100 ft² = 0.00229568 acre
Square feet to acres conversion table
| Square feet (ft²) | Acres (acre) |
|---|---|
| 1 | 0.0000229568 |
| 2 | 0.0000459137 |
| 3 | 0.0000688705 |
| 4 | 0.0000918274 |
| 5 | 0.000114784 |
| 6 | 0.000137741 |
| 7 | 0.000160698 |
| 8 | 0.000183655 |
| 9 | 0.000206612 |
| 10 | 0.000229568 |
| 15 | 0.000344353 |
| 20 | 0.000459137 |
| 25 | 0.000573921 |
| 30 | 0.000688705 |
| 40 | 0.000918274 |
| 50 | 0.00114784 |
| 75 | 0.00172176 |
| 100 | 0.00229568 |
| 200 | 0.00459137 |
| 250 | 0.00573921 |
| 500 | 0.0114784 |
| 1000 | 0.0229568 |
FAQ
How many acres are in one square foot?
1 ft² = 0.0000229568 acre. 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 acres?
Multiply the value in square feet by 0.00002295684114: acres = square feet × 0.00002295684114. For example, 5 ft² = 0.000114784 acre.
How do I convert acres back to square feet?
Multiply by the inverse factor 43560 (square feet = acres × 43560), or use the acres-to-square feet page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=ft2&to_unit=acre - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"ft2","to_unit":"acre"} - Markdown: https://tttkmbb.com/conversion/square-feet-to-acres.md · JSON: https://tttkmbb.com/conversion/square-feet-to-acres.json (add
?value=for a result) · Units: /api/v1/units?quantity=area - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.