Mass per volume density.
Grains per Gallon to Milligrams per Imperial gallon Converter — gr/gal to mg/imp gal
Convert Grain per Gallon (gr/gal) to Milligram per Imperial gallon (mg/imp gal) using the exact conversion factor (1 grain per gallon = 77.82024614 milligram per imperial gallon). See the formula, worked examples, and conversion table.
Grains per Gallon to Milligrams per Imperial gallon 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 0.01711806105 / 0.0002199692483.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Gallon to Milligrams per Imperial gallon
Grain per Gallon and Milligram per Imperial gallon 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
milligrams per imperial gallon = grains per gallon × 77.8202461373
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per gallon equals 0.0171180610453 base units, and 1 milligram per imperial gallon equals 0.000219969248299 base units, so dividing one by the other gives the direct grain per gallon-to-milligram per imperial gallon factor of 77.8202461373.
Simple example
1 gr/gal × 77.82024614 = 77.82024614 mg/imp gal
1 grain per gallon = 77.82024614 milligrams per imperial gallon.
Real-world example
1,000 gr/gal × 77.82024614 = 77,820.24614 mg/imp gal
1,000 grains per gallon = 77,820.24614 milligrams per imperial gallon.
Conversion table
| Grain per Gallon (gr/gal) | Milligram per Imperial gallon (mg/imp gal) |
|---|---|
| 0.1 gr/gal | 7.782024614 mg/imp gal |
| 1 gr/gal | 77.82024614 mg/imp gal |
| 10 gr/gal | 778.2024614 mg/imp gal |
| 100 gr/gal | 7,782.024614 mg/imp gal |
| 1,000 gr/gal | 77,820.24614 mg/imp gal |
| 10,000 gr/gal | 778,202.4614 mg/imp gal |
Reverse conversion: Milligram per Imperial gallon to Grain per Gallon
77.82024614 mg/imp gal × 0.01285012641 = 1 gr/gal
77.82024614 milligrams per imperial gallon = 1 grains per gallon.
grains per gallon = milligrams per imperial gallon × 0.0128501264084
For a page dedicated to this direction, see Milligram per Imperial gallon to Grain per Gallon.
Understanding the Grain per Gallon (gr/gal)
Mass per volume density.
Understanding the Milligram per Imperial gallon (mg/imp gal)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per imperial gallon are in 1 grain per gallon?
1 grain per gallon equals 77.82024614 milligrams per imperial gallon, using the exact defined conversion factor rather than an estimate.
How do I convert grain per gallon to milligram per imperial gallon?
Multiply the grain per gallon value by 77.82024614. The converter above does this instantly to whatever precision you set.
How do I convert milligram per imperial gallon back to grain per gallon?
Use the reverse factor: 1 milligram per imperial gallon equals 0.0128501264 grains per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per gallon?
Grain per Gallon (gr/gal) is a unit of density.
What is a milligram per imperial gallon?
Milligram per Imperial gallon (mg/imp gal) is a unit of density.
Is the grain per gallon to milligram per imperial gallon conversion exact?
Yes. Both grain per gallon and milligram per imperial gallon are defined by fixed standards rather than physical artifacts, so the factor of 77.82024614 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.