Area converter
Pick two area units and type a number. Area factors are length factors squared: 1 square foot is 0.3048 × 0.3048 = 0.09290304 m², and one acre is 43,560 square feet.
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The answer updates as you type.
1 square foot =
0.092903m²
Formula: m² = ft² × 0.09290304
Show the steps
- Definition: 1 ft² = 0.09290304 m² exactly; SI unit of area
- 1 ft² × 0.09290304 = 0.092903 m²
Definitions used: 1 ft² = 0.09290304 m² exactly; SI unit of area.
Source: NIST SP 811, Appendix B.8, checked on .
1 square foot in every area unit
| Unit | Value |
|---|---|
| Square centimeters (cm²) | 929.03 |
| Square meters (m²) | 0.092903 |
| Square kilometers (km²) | 9.2903 × 10^-8 |
| Hectares (ha) | 0.0000092903 |
| Square inches (in²) | 144 |
| Square yards (yd²) | 0.111111 |
| Acres (ac) | 0.0000229568 |
| Square miles (mi²) | 3.58701 × 10^-8 |
The table follows the amount and the “From” unit you set in the converter above.
How each area unit is defined
These are the definitions the converter uses, as written in the source next to each one. Nothing is rounded before the calculation.
| Unit | Definition | In square meters |
|---|---|---|
| Square centimeter (cm²) | 1 cm² = 0.0001 m² | 0.0001 |
| Square meter (m²) | SI unit of area | 1 |
| Square kilometer (km²) | 1 km² = 1 000 000 m² | 1,000,000 |
| Hectare (ha) | 1 ha = 10 000 m² exactly | 10,000 |
| Square inch (in²) | 1 in² = 6.4516 cm² exactly | 0.00064516 |
| Square foot (ft²) | 1 ft² = 0.09290304 m² exactly | 0.09290304 |
| Square yard (yd²) | 1 yd² = 9 ft² = 0.83612736 m² | 0.83612736 |
| Acre (ac) | 1 acre = 43 560 ft² = 4046.8564224 m² (international foot) | 4,046.856422 |
| Square mile (mi²) | 1 mi² = 640 acres = 27 878 400 ft² | 2,589,988.11 |
Area conversion questions
How many square feet are in an acre?
Exactly 43,560 square feet. A square acre would be about 208.71 feet on each side.
How large is a hectare?
A hectare is 10,000 m², a square of 100 m by 100 m. It equals 2.471 acres.
How many acres are in a square mile?
Exactly 640 acres.
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Sources and limits
- NIST SP 811, Appendix B.8
NIST Special Publication 811, Guide for the Use of the SI, Appendix B.8: Factors for Units Listed Alphabetically (page updated August 18, 2025).
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- NIST Handbook 44 (2026), Appendix C
NIST Handbook 44-2026, Appendix C: General Tables of Units of Measurement.
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
This is a calculation aid, not an official measurement service. Results are rounded to 6 significant digits for display. For trade, engineering, medical dosing or legal documents, confirm the figure in the official source. Nothing you type leaves your browser.