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Acres to Square feet (acre to ft²)
Convert acres to square feet: 1 acre = 43560 ft². Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 acre = 43560 ft²
square feet = acres × 43560 — reverse: acres = square feet × 0.00002295684114
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 acre = 217800 ft²
- 12.5 acre = 544500 ft²
- 100 acre = 4356000 ft²
Acres to square feet conversion table
| Acres (acre) | Square feet (ft²) |
|---|---|
| 1 | 43560 |
| 2 | 87120 |
| 3 | 130680 |
| 4 | 174240 |
| 5 | 217800 |
| 6 | 261360 |
| 7 | 304920 |
| 8 | 348480 |
| 9 | 392040 |
| 10 | 435600 |
| 15 | 653400 |
| 20 | 871200 |
| 25 | 1089000 |
| 30 | 1306800 |
| 40 | 1742400 |
| 50 | 2178000 |
| 75 | 3267000 |
| 100 | 4356000 |
| 200 | 8712000 |
| 250 | 10890000 |
| 500 | 21780000 |
| 1000 | 43560000 |
FAQ
How many square feet are in one acre?
1 acre = 43560 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 acres to square feet?
Multiply the value in acres by 43560: square feet = acres × 43560. For example, 5 acre = 217800 ft².
How do I convert square feet back to acres?
Multiply by the inverse factor 0.00002295684114 (acres = square feet × 0.00002295684114), or use the square feet-to-acres page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=acre&to_unit=ft2 - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"acre","to_unit":"ft2"} - Markdown: https://tttkmbb.com/conversion/acres-to-square-feet.md · JSON: https://tttkmbb.com/conversion/acres-to-square-feet.json (add
?value=for a result) · Units: /api/v1/units?quantity=area - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.