Square metric area unit.
Square Gigameters to Barns Converter — Gm2 to b
Convert Square Gigameter (Gm2) to Barn (b) using the exact conversion factor (1 square gigameter = 1e+46 barn). See the formula, worked examples, and conversion table.
Square Gigameters to Barns 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 barn is a nuclear cross-section unit equal to 1e-28 square meters.
Result = input x 1e+18 / 1e-28.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Square Gigameters to Barns
Comparing Square Gigameter and Barn 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: Square metric area unit, and a barn is a nuclear cross-section unit equal to 1e-28 square meters.
Formula
barns = square gigameters × 1e+46
This factor comes from each unit's defined relationship to the category's base unit: 1 square gigameter equals 1e+18 base units, and 1 barn equals 1e-28 base units, so dividing one by the other gives the direct square gigameter-to-barn factor of 1e+46.
Simple example
1 Gm2 × 1e+46 = 1e+46 b
1 square gigameter = 1e+46 barns.
Real-world example
10 Gm2 × 1e+46 = 1e+47 b
10 square gigameters = 1e+47 barns.
Conversion table
| Square Gigameter (Gm2) | Barn (b) |
|---|---|
| 1 Gm2 | 1e+46 b |
| 5 Gm2 | 5e+46 b |
| 10 Gm2 | 1e+47 b |
| 25 Gm2 | 2.5e+47 b |
| 50 Gm2 | 5e+47 b |
| 100 Gm2 | 1e+48 b |
Reverse conversion: Barn to Square Gigameter
1e+46 b × 1e-46 = 1 Gm2
1e+46 barns = 1 square gigameter.
square gigameters = barns × 1e-46
For a page dedicated to this direction, see Barn to Square Gigameter.
Understanding the Square Gigameter (Gm2)
Square metric area unit.
Understanding the Barn (b)
A barn is a nuclear cross-section unit equal to 1e-28 square meters.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many barns are in 1 square gigameter?
1 square gigameter equals 1e+46 barns, using the exact defined conversion factor rather than an estimate.
How do I convert square gigameter to barn?
Multiply the square gigameter value by 1e+46. The converter above does this instantly to whatever precision you set.
How do I convert barn back to square gigameter?
Use the reverse factor: 1 barn equals 1e-46 square gigameters. You can also use the swap control in the converter above to flip the direction instantly.
What is a square gigameter?
Square Gigameter (Gm2) is a unit of area.
What is a barn?
Barn (b) is a unit of area.
Is the square gigameter to barn conversion exact?
Yes. Both square gigameter and barn are defined by fixed standards rather than physical artifacts, so the factor of 1e+46 used above is exact to as many digits as you choose to display.