A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Barns to Square Hectometers Converter — b to hm2
Convert Barn (b) to Square Hectometer (hm2) using the exact conversion factor (1 barn = 1e-32 square hectometer). See the formula, worked examples, and conversion table.
Barns to Square Hectometers 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.
Square metric area unit.
Result = input x 1e-28 / 10000.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Barns to Square Hectometers
Comparing Barn and Square Hectometer 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 square metric area unit.
Formula
square hectometers = barns × 1e-32
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 hectometer equals 10000 base units, so dividing one by the other gives the direct barn-to-square hectometer factor of 1e-32.
Simple example
1 b × 1e-32 = 1e-32 hm2
1 barn = 1e-32 square hectometers.
Real-world example
10 b × 1e-32 = 1e-31 hm2
10 barns = 1e-31 square hectometers.
Conversion table
| Barn (b) | Square Hectometer (hm2) |
|---|---|
| 1 b | 1e-32 hm2 |
| 5 b | 5e-32 hm2 |
| 10 b | 1e-31 hm2 |
| 25 b | 2.5e-31 hm2 |
| 50 b | 5e-31 hm2 |
| 100 b | 1e-30 hm2 |
Reverse conversion: Square Hectometer to Barn
1e-32 hm2 × 1e+32 = 1 b
1e-32 square hectometers = 1 barns.
barns = square hectometers × 1e+32
For a page dedicated to this direction, see Square Hectometer to Barn.
Understanding the Barn (b)
A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Understanding the Square Hectometer (hm2)
Square metric area unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many square hectometers are in 1 barn?
1 barn equals 1e-32 square hectometers, using the exact defined conversion factor rather than an estimate.
How do I convert barn to square hectometer?
Multiply the barn value by 1e-32. The converter above does this instantly to whatever precision you set.
How do I convert square hectometer back to barn?
Use the reverse factor: 1 square hectometer equals 1e+32 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 hectometer?
Square Hectometer (hm2) is a unit of area.
Is the barn to square hectometer conversion exact?
Yes. Both barn and square hectometer are defined by fixed standards rather than physical artifacts, so the factor of 1e-32 used above is exact to as many digits as you choose to display.