Mass per volume density.
Grains per Cubic Millimeter to Stones per Imperial gallon Converter — gr/mm3 to st/imp gal
Convert Grain per Cubic Millimeter (gr/mm3) to Stone per Imperial gallon (st/imp gal) using the exact conversion factor (1 grain per cubic millimeter = 46.38867347 stone per imperial gallon). See the formula, worked examples, and conversion table.
Grains per Cubic Millimeter to Stones 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 64798.91 / 1396.869217.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Cubic Millimeter to Stones per Imperial gallon
Grain per Cubic Millimeter and Stone 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
stones per imperial gallon = grains per cubic millimeter × 46.3886734694
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cubic millimeter equals 64798.91 base units, and 1 stone per imperial gallon equals 1396.86921728 base units, so dividing one by the other gives the direct grain per cubic millimeter-to-stone per imperial gallon factor of 46.3886734694.
Simple example
1 gr/mm3 × 46.38867347 = 46.38867347 st/imp gal
1 grain per cubic millimeter = 46.38867347 stones per imperial gallon.
Real-world example
1,000 gr/mm3 × 46.38867347 = 46,388.67347 st/imp gal
1,000 grains per cubic millimeter = 46,388.67347 stones per imperial gallon.
Conversion table
| Grain per Cubic Millimeter (gr/mm3) | Stone per Imperial gallon (st/imp gal) |
|---|---|
| 0.1 gr/mm3 | 4.638867347 st/imp gal |
| 1 gr/mm3 | 46.38867347 st/imp gal |
| 10 gr/mm3 | 463.8867347 st/imp gal |
| 100 gr/mm3 | 4,638.867347 st/imp gal |
| 1,000 gr/mm3 | 46,388.67347 st/imp gal |
| 10,000 gr/mm3 | 463,886.7347 st/imp gal |
Reverse conversion: Stone per Imperial gallon to Grain per Cubic Millimeter
46.38867347 st/imp gal × 0.02155698633 = 1 gr/mm3
46.38867347 stones per imperial gallon = 1 grains per cubic millimeter.
grains per cubic millimeter = stones per imperial gallon × 0.0215569863333
For a page dedicated to this direction, see Stone per Imperial gallon to Grain per Cubic Millimeter.
Understanding the Grain per Cubic Millimeter (gr/mm3)
Mass per volume density.
Understanding the Stone per Imperial gallon (st/imp gal)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per imperial gallon are in 1 grain per cubic millimeter?
1 grain per cubic millimeter equals 46.38867347 stones per imperial gallon, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cubic millimeter to stone per imperial gallon?
Multiply the grain per cubic millimeter value by 46.38867347. The converter above does this instantly to whatever precision you set.
How do I convert stone per imperial gallon back to grain per cubic millimeter?
Use the reverse factor: 1 stone per imperial gallon equals 0.0215569863 grains per cubic millimeter. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cubic millimeter?
Grain per Cubic Millimeter (gr/mm3) is a unit of density.
What is a stone per imperial gallon?
Stone per Imperial gallon (st/imp gal) is a unit of density.
Is the grain per cubic millimeter to stone per imperial gallon conversion exact?
Yes. Both grain per cubic millimeter and stone per imperial gallon are defined by fixed standards rather than physical artifacts, so the factor of 46.38867347 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.