Mass per volume density.
Stones per Imperial gallon to Grains per Quart Converter — st/imp gal to gr/qt
Convert Stone per Imperial gallon (st/imp gal) to Grain per Quart (gr/qt) using the exact conversion factor (1 stone per imperial gallon = 20,400.51752 grain per quart). See the formula, worked examples, and conversion table.
Stones per Imperial gallon to Grains per Quart 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 1396.869217 / 0.06847224418.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Imperial gallon to Grains per Quart
Stone per Imperial gallon and Grain per Quart 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 quart = stones per imperial gallon × 20400.5175234
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per imperial gallon equals 1396.86921728 base units, and 1 grain per quart equals 0.0684722441811 base units, so dividing one by the other gives the direct stone per imperial gallon-to-grain per quart factor of 20400.5175234.
Simple example
1 st/imp gal × 20400.51752 = 20,400.51752 gr/qt
1 stone per imperial gallon = 20,400.51752 grains per quart.
Real-world example
1,000 st/imp gal × 20400.51752 = 20,400,517.52 gr/qt
1,000 stones per imperial gallon = 20,400,517.52 grains per quart.
Conversion table
| Stone per Imperial gallon (st/imp gal) | Grain per Quart (gr/qt) |
|---|---|
| 0.1 st/imp gal | 2,040.051752 gr/qt |
| 1 st/imp gal | 20,400.51752 gr/qt |
| 10 st/imp gal | 204,005.1752 gr/qt |
| 100 st/imp gal | 2,040,051.752 gr/qt |
| 1,000 st/imp gal | 20,400,517.52 gr/qt |
| 10,000 st/imp gal | 204,005,175.2 gr/qt |
Reverse conversion: Grain per Quart to Stone per Imperial gallon
1 gr/qt × 0.00004901836431 = 0.0000490184 st/imp gal
1 grain per quart = 0.0000490184 stones per imperial gallon.
stones per imperial gallon = grains per quart × 0.0000490183643063
For a page dedicated to this direction, see Grain per Quart to Stone per Imperial gallon.
Understanding the Stone per Imperial gallon (st/imp gal)
Mass per volume density.
Understanding the Grain per Quart (gr/qt)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per quart are in 1 stone per imperial gallon?
1 stone per imperial gallon equals 20,400.51752 grains per quart, using the exact defined conversion factor rather than an estimate.
How do I convert stone per imperial gallon to grain per quart?
Multiply the stone per imperial gallon value by 20400.51752. The converter above does this instantly to whatever precision you set.
How do I convert grain per quart back to stone per imperial gallon?
Use the reverse factor: 1 grain per quart equals 0.0000490184 stones per imperial gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per imperial gallon?
Stone per Imperial gallon (st/imp gal) is a unit of density.
What is a grain per quart?
Grain per Quart (gr/qt) is a unit of density.
Is the stone per imperial gallon to grain per quart conversion exact?
Yes. Both stone per imperial gallon and grain per quart are defined by fixed standards rather than physical artifacts, so the factor of 20400.51752 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.