Square feet and square meters
Convert an area, not a length
To convert square feet to square meters, multiply the area by 0.09290304. To convert square meters to square feet, divide by the same factor. Select the unit your starting value already uses, then enter that area in the converter above. The result describes the same surface in another unit; it does not add material or change the size of a room.
This tool needs one known area. If you have only a length and width, calculate the area first. A 10 ft by 12 ft rectangle has 120 ft² of area: multiply the dimensions rather than adding them. An L-shaped room needs its sections measured and combined without overlap; use the L-shaped room guide before converting that total.
Why the factor is squared
NIST international-foot definition gives the international foot as exactly 0.3048 m. A square foot has two dimensions, each one foot long. Converting both sides gives 0.3048 m × 0.3048 m = 0.09290304 m². That square-foot factor is derived arithmetic from the length definition.
For the 10 ft by 12 ft rectangle, the converted dimensions are 3.048 m and 3.6576 m. Multiplying them gives 11.1483648 m². Converting the already calculated 120 ft² directly gives the same answer: 120 × 0.09290304 = 11.1483648. This is a useful cross-check when both dimensions and a stated area are available.
Multiplying 120 by the length factor alone gives 36.576, which is not the correct square-meter area. Writing an m² label beside that number cannot fix the calculation. Conversely, do not square the area value itself: the unit factor is squared, while the area is multiplied by that factor once.
Worked examples in both directions
| Input | Operation | Result |
|---|---|---|
| 100 ft² | 100 × 0.09290304 | 9.290304 m² |
| 9.290304 m² | 9.290304 ÷ 0.09290304 | 100 ft² |
| 120 ft² | 120 × 0.09290304 | 11.1483648 m² |
| 25 m² | 25 ÷ 0.09290304 | Approximately 269.0978 ft² |
| 0 ft² | 0 × 0.09290304 | 0 m² |
For the forward example, choose ft² and enter 120; the main result is 11.1484 m² after display rounding. For a separate reverse example, choose m² and enter 25; the main result is 269.0978 ft². The mathematical quotient continues beyond the displayed digits, so that reverse result is approximate as written. All these examples are calculated scenarios, not measurements of a real property.
The direction-switch button changes the input unit and clears the entry. It does not automatically transfer the previous result. To check a round trip, keep a record of your original input and enter the appropriate converted value yourself, within the input precision limit.
Prepare a usable input
Keep the measurement’s number and unit together in your notes. A bare 120 is ambiguous: 120 m² is much larger than 120 ft². If dimensions use different length units, first make them consistent with the length converter, calculate the area, and then select the matching square unit here.
| Check | What to enter or do | Why it matters |
|---|---|---|
| Source unit | Select ft² or m² to match the known area | Choosing the wrong unit changes the direction |
| Number format | Enter 120.5, without units or commas |
120.5 ft² and 1,200 are unsupported inputs |
| Allowed range | Use 0 through 1,000,000 | Values above the input maximum are rejected |
| Decimal places | Use at most six digits after the decimal point | Additional input digits are rejected, not silently rounded |
| Missing value | Find the area before entering it | A blank field is not a measured zero |
Zero is valid and converts to zero. Negative numbers and exponential notation such as 1e3 are not supported. Use a decimal point, not a decimal comma; for one thousand two hundred, type 1200. These restrictions concern what the input accepts, not a recommended accuracy for your measurements.
Read rounding without losing the original value
The main result shows four decimal places using half-up rounding. Expand “More digits” to see an approximate display with up to twelve decimal places. More displayed digits can help inspect the calculation, but they do not make the original measurement more precise.
For example, 100 ft² converts mathematically to 9.290304 m², while the main result shows 9.2903. Entering the four-place display back into the reverse calculation gives approximately 99.9999569444 ft², displayed as 100.0000. The difference comes from dropping digits before the reverse calculation. A rounded display matching the original does not mean that no digits were lost.
The exact six-place value 9.290304 fits the input limit and returns 100 ft². Other conversions can produce more than six decimals, so their full expanded display cannot always be re-entered. Keep the original input and formula for later arithmetic; round when presenting a result rather than repeatedly converting copied display text.
A very small positive input can display 0.0000 at four places. For example, 0.000001 ft² is 0.00000009290304 m², which is positive. The below-display-precision notice and expanded digits distinguish this from an actual zero. Likewise, if “100 ft²” was only an estimate, its converted digits remain an estimate of that same surface.
Choose the next task
Before using the result, check which surface the source area describes. Floor area, wall area and a property’s stated area are not interchangeable merely because all use square units. This converter cannot identify excluded corners, verify a listing or correct inconsistent measurements.
For materials, the converted area is a measurement input, not an order quantity. The flooring box planner handles entered coverage and whole-carton purchasing; this conversion adds no installation allowance or repair reserve. If comparing an existing USD price per ft² with a USD price per m², use the area-price converter for that separate task. Changing an area unit is not a currency exchange.
Source and scope
NIST — U.S. Survey Foot: Revised Unit Conversion Factors, checked October 3, 2026, supports the exact international-foot definition. The area factor and all worked examples here are authored calculations. Historical records explicitly using the U.S. survey foot require separate interpretation; this tool uses the international foot only.
AI-assisted content. Examples are hypothetical and do not certify a property’s dimensions or a material purchase.