A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Barns to Square feet Converter — b to ft2
Convert Barn (b) to Square foot (ft2) using the exact conversion factor (1 barn = 1.076391e-27 square foot). See the formula, worked examples, conversion table, history, and common uses.
Barns to Square feet converter
Converter
Area Converter
Convert land, construction, mapping, survey, and scientific area units.
Context values
Some unit families need one extra value for a physically accurate result.
A square foot is exactly 0.09290304 square meters.
Result = input x 1e-28 / 0.09290304.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Barns to Square feet
Comparing Barn and Square foot is common in agriculture and real estate, where US land is typically measured in acres and most of the rest of the world uses hectares. Specifically: A barn is a nuclear cross-section unit equal to 1e-28 square meters, and a square foot is exactly 0.09290304 square meters.
Formula
square feet = barns × 1.076391e-27
This factor comes from each unit's defined relationship to the category's base unit: 1 barn equals 1e-28 base units, and 1 square foot equals 0.09290304 base units, so dividing one by the other gives the direct barn-to-square foot factor of 1.076391e-27.
Simple example
1 b × 1.076391e-27 = 1.076391e-27 ft2
1 barn = 1.076391e-27 square feet.
Real-world example
10 b × 1.076391e-27 = 1.076391e-26 ft2
10 barns = 1.076391e-26 square feet.
Conversion table
| Barn (b) | Square foot (ft2) |
|---|---|
| 1 b | 1.076391e-27 ft2 |
| 5 b | 5.381955e-27 ft2 |
| 10 b | 1.076391e-26 ft2 |
| 25 b | 2.690978e-26 ft2 |
| 50 b | 5.381955e-26 ft2 |
| 100 b | 1.076391e-25 ft2 |
Reverse conversion: Square foot to Barn
1.076391e-27 ft2 × 9.290304e+26 = 0.9999999613 b
1.076391e-27 square feet = 0.9999999613 barns.
barns = square feet × 9.290304e+26
For a page dedicated to this direction, see Square foot to Barn.
Understanding the Barn (b)
A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Understanding the Square foot
Square foot (ft2) measures area. A square foot is exactly 0.09290304 square meters, derived from the international foot fixed in 1959. It is classified as a US/imperial customary unit.
Where it's used: United States (real estate, construction) United Kingdom (some real estate and construction contexts)
Uses of the Square foot today
- Real estate floor-space listings in the US
- Construction, flooring, and materials estimation
- Rental and commercial property pricing
History of the Square foot
The square foot follows directly from the foot, standardized in England over centuries and fixed at exactly 0.3048 meters by the 1959 International Yard and Pound Agreement. Squaring that value gives the modern square foot.
Historical origin. Square foot was not the invention of a single named person; it developed through the process described above.
Square foot — sources
- NIST — International yard and pound (1959) — Basis for the modern foot and its derived area unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many square feet are in 1 barn?
1 barn equals 1.076391e-27 square feet, using the exact defined conversion factor rather than an estimate.
How do I convert barn to square foot?
Multiply the barn value by 1.076391e-27. The converter above does this instantly to whatever precision you set.
How do I convert square foot back to barn?
Use the reverse factor: 1 square foot equals 9.290304e+26 barns. You can also use the swap control in the converter above to flip the direction instantly.
What is a barn?
Barn (b) is a unit of area.
What is a square foot?
Square foot (ft2) measures area. A square foot is exactly 0.09290304 square meters, derived from the international foot fixed in 1959. It is classified as a US/imperial customary unit.
Is the barn to square foot conversion exact?
Yes. A square foot is exactly 0.09290304 square meters, derived from the international foot fixed in 1959. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.