Mass application rate.
Grams per Acre to Grams per Square mile Converter — g/ac to g/mi2
Convert Gram per Acre (g/ac) to Gram per Square mile (g/mi2) using the exact conversion factor (1 gram per acre = 640 gram per square mile). See the formula, worked examples, and conversion table.
Grams per Acre to Grams per Square mile converter
Converter
Agriculture Converter
Convert acres, hectares, yield, seed, fertilizer, irrigation, and application-rate units.
Context values
Some unit families need one extra value for a physically accurate result.
Mass application rate.
Result = input x 2.47105381e-7 / 3.86102159e-10.
Mass Application Rate units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Grams per Acre to Grams per Square mile
Gram per Acre and Gram per Square mile both measure a farming-related quantity — a land area or an application/yield rate per unit area — used to report crop yields, calculate how much fertilizer or seed a field needs, and plan irrigation. Both are mass application rate units.
Formula
grams per square mile = grams per acre × 640
This factor comes from each unit's defined relationship to the category's base unit: 1 gram per acre equals 2.471054e-7 base units, and 1 gram per square mile equals 3.861022e-10 base units, so dividing one by the other gives the direct gram per acre-to-gram per square mile factor of 640.
Simple example
1 g/ac × 640 = 640 g/mi2
1 gram per acre = 640 grams per square mile.
Real-world example
100 g/ac × 640 = 64,000 g/mi2
100 grams per acre = 64,000 grams per square mile.
Conversion table
| Gram per Acre (g/ac) | Gram per Square mile (g/mi2) |
|---|---|
| 1 g/ac | 640 g/mi2 |
| 5 g/ac | 3,200 g/mi2 |
| 10 g/ac | 6,400 g/mi2 |
| 50 g/ac | 32,000 g/mi2 |
| 100 g/ac | 64,000 g/mi2 |
| 500 g/ac | 320,000 g/mi2 |
Reverse conversion: Gram per Square mile to Gram per Acre
640 g/mi2 × 0.0015625 = 1 g/ac
640 grams per square mile = 1 gram per acre.
grams per acre = grams per square mile × 0.0015625
For a page dedicated to this direction, see Gram per Square mile to Gram per Acre.
Understanding the Gram per Acre (g/ac)
Mass application rate.
Understanding the Gram per Square mile (g/mi2)
Mass application rate.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grams per square mile are in 1 gram per acre?
1 gram per acre equals 640 grams per square mile, using the exact defined conversion factor rather than an estimate.
How do I convert gram per acre to gram per square mile?
Multiply the gram per acre value by 640. The converter above does this instantly to whatever precision you set.
How do I convert gram per square mile back to gram per acre?
Use the reverse factor: 1 gram per square mile equals 0.0015625 grams per acre. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram per acre?
Gram per Acre (g/ac) is a unit of agriculture.
What is a gram per square mile?
Gram per Square mile (g/mi2) is a unit of agriculture.
Is the gram per acre to gram per square mile conversion exact?
Yes. Both gram per acre and gram per square mile are defined by fixed standards rather than physical artifacts, so the factor of 640 used above is exact to as many digits as you choose to display.
What's the difference between a yield rate and an application rate?
A yield rate describes how much of a crop is harvested per unit of land area (for example, tonnes per hectare). An application rate describes how much of an input like fertilizer or seed is applied per unit of land area. Both are commonly expressed using the same kind of mass-per-area units.