The formula
m² = ft² × 0.09290304
Where the factor comes from — each unit by its definition, then its size in SI:
1 ft² = ft² = 0.09290304 m²1 m² is the SI unit of area.
Dividing the two SI sizes gives the factor: 0.09290304, exact — every step above is a definition, not a measurement. The reverse factor is 10.7639104167.
Area in SI is the square metre. Squaring a length conversion squares its factor: 1 ft = 0.3048 m, so 1 ft² is 0.3048² m².
Worked examples
- A shoe sole: 0.215278 ft² = 0.02 m² — 0.215278 × 0.09290304 = 0.02
- A gauge face (1 in²): 0.00694444 ft² = 0.00064516 m² — 0.00694444 × 0.09290304 = 0.00064516
- A small room: 107.639 ft² = 10 m² — 107.639 × 0.09290304 = 10
Frequently asked questions
How many square metres is 1 ft²?
1 ft² = 0.09290304 m², exactly, from the unit definitions.
How do I convert square metres back to square feet?
Divide by 0.09290304 — or multiply by 10.7639104167: 1 m² = 10.7639104167 ft².