Mass per volume density.
Milligrams per Gallon to Grains per Liter Converter — mg/gal to gr/L
Convert Milligram per Gallon (mg/gal) to Grain per Liter (gr/L) using the exact conversion factor (1 milligram per gallon = 0.0040767978 grain per liter). See the formula, worked examples, and conversion table.
Milligrams per Gallon to Grains per Liter converter
Converter
Density Converter
Convert thousands of mass-per-volume density combinations for science, engineering, agriculture, and fluids.
Context values
Some unit families need one extra value for a physically accurate result.
Mass per volume density.
Result = input x 0.0002641720524 / 0.06479891.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Milligrams per Gallon to Grains per Liter
Milligram per Gallon and Grain per Liter both measure density — mass per unit volume — a property used to identify materials, check manufacturing quality, and predict whether something floats or sinks. As a fixed reference point, water has a density of exactly 1000 kg/m³ (1 g/cm³, 1 g/mL) at its temperature of maximum density, which is why many density figures in science and engineering are quoted relative to water. Both are mass per volume density units.
Formula
grains per liter = milligrams per gallon × 0.00407679777882
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram per gallon equals 0.000264172052358 base units, and 1 grain per liter equals 0.06479891 base units, so dividing one by the other gives the direct milligram per gallon-to-grain per liter factor of 0.00407679777882.
Simple example
1 mg/gal × 0.004076797779 = 0.0040767978 gr/L
1 milligram per gallon = 0.0040767978 grains per liter.
Real-world example
1,000 mg/gal × 0.004076797779 = 4.076797779 gr/L
1,000 milligrams per gallon = 4.076797779 grains per liter.
Conversion table
| Milligram per Gallon (mg/gal) | Grain per Liter (gr/L) |
|---|---|
| 0.1 mg/gal | 0.0004076798 gr/L |
| 1 mg/gal | 0.0040767978 gr/L |
| 10 mg/gal | 0.0407679778 gr/L |
| 100 mg/gal | 0.4076797779 gr/L |
| 1,000 mg/gal | 4.076797779 gr/L |
| 10,000 mg/gal | 40.76797779 gr/L |
Reverse conversion: Grain per Liter to Milligram per Gallon
0.0040767978 gr/L × 245.2905575 = 1.000000005 mg/gal
0.0040767978 grains per liter = 1.000000005 milligrams per gallon.
milligrams per gallon = grains per liter × 245.290557504
For a page dedicated to this direction, see Grain per Liter to Milligram per Gallon.
Understanding the Milligram per Gallon (mg/gal)
Mass per volume density.
Understanding the Grain per Liter (gr/L)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per liter are in 1 milligram per gallon?
1 milligram per gallon equals 0.0040767978 grains per liter, using the exact defined conversion factor rather than an estimate.
How do I convert milligram per gallon to grain per liter?
Multiply the milligram per gallon value by 0.004076797779. The converter above does this instantly to whatever precision you set.
How do I convert grain per liter back to milligram per gallon?
Use the reverse factor: 1 grain per liter equals 245.2905575 milligrams per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram per gallon?
Milligram per Gallon (mg/gal) is a unit of density.
What is a grain per liter?
Grain per Liter (gr/L) is a unit of density.
Is the milligram per gallon to grain per liter conversion exact?
Yes. Both milligram per gallon and grain per liter are defined by fixed standards rather than physical artifacts, so the factor of 0.004076797779 used above is exact to as many digits as you choose to display.
What's the difference between density and mass concentration?
Density is the mass of a pure substance or material per unit volume. Mass concentration is the mass of one component — like a dissolved solute — within a mixture's total volume. The two use the same kind of units but describe different physical situations.