Square metric area unit.
Square Decimeters to Square Gigameters Converter — dm2 to Gm2
Convert Square Decimeter (dm2) to Square Gigameter (Gm2) using the exact conversion factor (1 square decimeter = 1e-20 square gigameter). See the formula, worked examples, and conversion table.
Square Decimeters to Square Gigameters 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 0.01 / 1e+18.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Square Decimeters to Square Gigameters
Comparing Square Decimeter and Square Gigameter 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. Both are square metric area unit units.
Formula
square gigameters = square decimeters × 1e-20
This factor comes from each unit's defined relationship to the category's base unit: 1 square decimeter equals 0.01 base units, and 1 square gigameter equals 1e+18 base units, so dividing one by the other gives the direct square decimeter-to-square gigameter factor of 1e-20.
Simple example
1 dm2 × 1e-20 = 1e-20 Gm2
1 square decimeter = 1e-20 square gigameters.
Real-world example
10 dm2 × 1e-20 = 1e-19 Gm2
10 square decimeters = 1e-19 square gigameters.
Conversion table
| Square Decimeter (dm2) | Square Gigameter (Gm2) |
|---|---|
| 1 dm2 | 1e-20 Gm2 |
| 5 dm2 | 5e-20 Gm2 |
| 10 dm2 | 1e-19 Gm2 |
| 25 dm2 | 2.5e-19 Gm2 |
| 50 dm2 | 5e-19 Gm2 |
| 100 dm2 | 1e-18 Gm2 |
Reverse conversion: Square Gigameter to Square Decimeter
1e-20 Gm2 × 1e+20 = 1 dm2
1e-20 square gigameters = 1 square decimeters.
square decimeters = square gigameters × 1e+20
For a page dedicated to this direction, see Square Gigameter to Square Decimeter.
Understanding the Square Decimeter (dm2)
Square metric area unit.
Understanding the Square Gigameter (Gm2)
Square metric area unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many square gigameters are in 1 square decimeter?
1 square decimeter equals 1e-20 square gigameters, using the exact defined conversion factor rather than an estimate.
How do I convert square decimeter to square gigameter?
Multiply the square decimeter value by 1e-20. The converter above does this instantly to whatever precision you set.
How do I convert square gigameter back to square decimeter?
Use the reverse factor: 1 square gigameter equals 1e+20 square decimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a square decimeter?
Square Decimeter (dm2) is a unit of area.
What is a square gigameter?
Square Gigameter (Gm2) is a unit of area.
Is the square decimeter to square gigameter conversion exact?
Yes. Both square decimeter and square gigameter are defined by fixed standards rather than physical artifacts, so the factor of 1e-20 used above is exact to as many digits as you choose to display.