Mass application rate.
Grams per Square Kilometer to Milligrams per Square Meter Converter — g/km2 to mg/m2
Convert Gram per Square Kilometer (g/km2) to Milligram per Square Meter (mg/m2) using the exact conversion factor (1 gram per square kilometer = 0.001 milligram per square meter). See the formula, worked examples, and conversion table.
Grams per Square Kilometer to Milligrams per Square Meter 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 1e-9 / 1e-6.
Mass Application Rate units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Grams per Square Kilometer to Milligrams per Square Meter
Gram per Square Kilometer and Milligram per Square Meter 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
milligrams per square meter = grams per square kilometer × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 gram per square kilometer equals 1e-9 base units, and 1 milligram per square meter equals 0.000001 base units, so dividing one by the other gives the direct gram per square kilometer-to-milligram per square meter factor of 0.001.
Simple example
1 g/km2 × 0.001 = 0.001 mg/m2
1 gram per square kilometer = 0.001 milligrams per square meter.
Real-world example
100 g/km2 × 0.001 = 0.1 mg/m2
100 grams per square kilometer = 0.1 milligrams per square meter.
Conversion table
| Gram per Square Kilometer (g/km2) | Milligram per Square Meter (mg/m2) |
|---|---|
| 1 g/km2 | 0.001 mg/m2 |
| 5 g/km2 | 0.005 mg/m2 |
| 10 g/km2 | 0.01 mg/m2 |
| 50 g/km2 | 0.05 mg/m2 |
| 100 g/km2 | 0.1 mg/m2 |
| 500 g/km2 | 0.5 mg/m2 |
Reverse conversion: Milligram per Square Meter to Gram per Square Kilometer
0.001 mg/m2 × 1000 = 1 g/km2
0.001 milligrams per square meter = 1 gram per square kilometer.
grams per square kilometer = milligrams per square meter × 1000
For a page dedicated to this direction, see Milligram per Square Meter to Gram per Square Kilometer.
Understanding the Gram per Square Kilometer (g/km2)
Mass application rate.
Understanding the Milligram per Square Meter (mg/m2)
Mass application rate.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per square meter are in 1 gram per square kilometer?
1 gram per square kilometer equals 0.001 milligrams per square meter, using the exact defined conversion factor rather than an estimate.
How do I convert gram per square kilometer to milligram per square meter?
Multiply the gram per square kilometer value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert milligram per square meter back to gram per square kilometer?
Use the reverse factor: 1 milligram per square meter equals 1,000 grams per square kilometer. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram per square kilometer?
Gram per Square Kilometer (g/km2) is a unit of agriculture.
What is a milligram per square meter?
Milligram per Square Meter (mg/m2) is a unit of agriculture.
Is the gram per square kilometer to milligram per square meter conversion exact?
Yes. Both gram per square kilometer and milligram per square meter are defined by fixed standards rather than physical artifacts, so the factor of 0.001 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.