Mass per volume density.
Grains per Cup to Stones per Gallon Converter — gr/cup to st/gal
Convert Grain per Cup (gr/cup) to Stone per Gallon (st/gal) using the exact conversion factor (1 grain per cup = 0.0001632653 stone per gallon). See the formula, worked examples, and conversion table.
Grains per Cup to Stones per 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 0.2738889767 / 1677.569982.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Cup to Stones per Gallon
Grain per Cup and Stone per 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 gallon = grains per cup × 0.000163265306122
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cup equals 0.273888976724 base units, and 1 stone per gallon equals 1677.56998244 base units, so dividing one by the other gives the direct grain per cup-to-stone per gallon factor of 0.000163265306122.
Simple example
1 gr/cup × 0.0001632653061 = 0.0001632653 st/gal
1 grain per cup = 0.0001632653 stones per gallon.
Real-world example
1,000 gr/cup × 0.0001632653061 = 0.1632653061 st/gal
1,000 grains per cup = 0.1632653061 stones per gallon.
Conversion table
| Grain per Cup (gr/cup) | Stone per Gallon (st/gal) |
|---|---|
| 0.1 gr/cup | 0.0000163265 st/gal |
| 1 gr/cup | 0.0001632653 st/gal |
| 10 gr/cup | 0.0016326531 st/gal |
| 100 gr/cup | 0.0163265306 st/gal |
| 1,000 gr/cup | 0.1632653061 st/gal |
| 10,000 gr/cup | 1.632653061 st/gal |
Reverse conversion: Stone per Gallon to Grain per Cup
0.0001632653 st/gal × 6125 = 0.9999999625 gr/cup
0.0001632653 stones per gallon = 0.9999999625 grains per cup.
grains per cup = stones per gallon × 6125
For a page dedicated to this direction, see Stone per Gallon to Grain per Cup.
Understanding the Grain per Cup (gr/cup)
Mass per volume density.
Understanding the Stone per Gallon (st/gal)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per gallon are in 1 grain per cup?
1 grain per cup equals 0.0001632653 stones per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cup to stone per gallon?
Multiply the grain per cup value by 0.0001632653061. The converter above does this instantly to whatever precision you set.
How do I convert stone per gallon back to grain per cup?
Use the reverse factor: 1 stone per gallon equals 6,125 grains per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cup?
Grain per Cup (gr/cup) is a unit of density.
What is a stone per gallon?
Stone per Gallon (st/gal) is a unit of density.
Is the grain per cup to stone per gallon conversion exact?
Yes. Both grain per cup and stone per gallon are defined by fixed standards rather than physical artifacts, so the factor of 0.0001632653061 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.