Mass application rate.
Pounds per Acre to Pounds per Square mile Converter — lb/ac to lb/mi2
Convert Pound per Acre (lb/ac) to Pound per Square mile (lb/mi2) using the exact conversion factor (1 pound per acre = 640 pound per square mile). See the formula, worked examples, and conversion table.
Pounds per Acre to Pounds 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 0.0001120851156 / 1.75132993e-7.
Mass Application Rate units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Acre to Pounds per Square mile
Pound per Acre and Pound 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
pounds per square mile = pounds per acre × 640
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per acre equals 0.000112085115619 base units, and 1 pound per square mile equals 1.75133e-7 base units, so dividing one by the other gives the direct pound per acre-to-pound per square mile factor of 640.
Simple example
1 lb/ac × 640 = 640 lb/mi2
1 pound per acre = 640 pounds per square mile.
Real-world example
100 lb/ac × 640 = 64,000 lb/mi2
100 pounds per acre = 64,000 pounds per square mile.
Conversion table
| Pound per Acre (lb/ac) | Pound per Square mile (lb/mi2) |
|---|---|
| 1 lb/ac | 640 lb/mi2 |
| 5 lb/ac | 3,200 lb/mi2 |
| 10 lb/ac | 6,400 lb/mi2 |
| 50 lb/ac | 32,000 lb/mi2 |
| 100 lb/ac | 64,000 lb/mi2 |
| 500 lb/ac | 320,000 lb/mi2 |
Reverse conversion: Pound per Square mile to Pound per Acre
640 lb/mi2 × 0.0015625 = 1 lb/ac
640 pounds per square mile = 1 pounds per acre.
pounds per acre = pounds per square mile × 0.0015625
For a page dedicated to this direction, see Pound per Square mile to Pound per Acre.
Understanding the Pound per Acre (lb/ac)
Mass application rate.
Understanding the Pound per Square mile (lb/mi2)
Mass application rate.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per square mile are in 1 pound per acre?
1 pound per acre equals 640 pounds per square mile, using the exact defined conversion factor rather than an estimate.
How do I convert pound per acre to pound per square mile?
Multiply the pound per acre value by 640. The converter above does this instantly to whatever precision you set.
How do I convert pound per square mile back to pound per acre?
Use the reverse factor: 1 pound per square mile equals 0.0015625 pounds per acre. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per acre?
Pound per Acre (lb/ac) is a unit of agriculture.
What is a pound per square mile?
Pound per Square mile (lb/mi2) is a unit of agriculture.
Is the pound per acre to pound per square mile conversion exact?
Yes. Both pound per acre and pound 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.