Mass per volume density.
Stones per Cup to Grains per Gallon Converter — st/cup to gr/gal
Convert Stone per Cup (st/cup) to Grain per Gallon (gr/gal) using the exact conversion factor (1 stone per cup = 1,568,000 grain per gallon). See the formula, worked examples, and conversion table.
Stones per Cup to Grains 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 26841.11972 / 0.01711806105.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Cup to Grains per Gallon
Stone per Cup and Grain 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
grains per gallon = stones per cup × 1568000
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per cup equals 26841.119719 base units, and 1 grain per gallon equals 0.0171180610453 base units, so dividing one by the other gives the direct stone per cup-to-grain per gallon factor of 1568000.
Simple example
1 st/cup × 1568000 = 1,568,000 gr/gal
1 stone per cup = 1,568,000 grains per gallon.
Real-world example
1,000 st/cup × 1568000 = 1,568,000,000 gr/gal
1,000 stones per cup = 1,568,000,000 grains per gallon.
Conversion table
| Stone per Cup (st/cup) | Grain per Gallon (gr/gal) |
|---|---|
| 0.1 st/cup | 156,800 gr/gal |
| 1 st/cup | 1,568,000 gr/gal |
| 10 st/cup | 15,680,000 gr/gal |
| 100 st/cup | 156,800,000 gr/gal |
| 1,000 st/cup | 1,568,000,000 gr/gal |
| 10,000 st/cup | 15,680,000,000 gr/gal |
Reverse conversion: Grain per Gallon to Stone per Cup
1 gr/gal × 6.377551e-7 = 6.377551e-7 st/cup
1 grain per gallon = 6.377551e-7 stones per cup.
stones per cup = grains per gallon × 6.377551e-7
For a page dedicated to this direction, see Grain per Gallon to Stone per Cup.
Understanding the Stone per Cup (st/cup)
Mass per volume density.
Understanding the Grain per Gallon (gr/gal)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per gallon are in 1 stone per cup?
1 stone per cup equals 1,568,000 grains per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert stone per cup to grain per gallon?
Multiply the stone per cup value by 1568000. The converter above does this instantly to whatever precision you set.
How do I convert grain per gallon back to stone per cup?
Use the reverse factor: 1 grain per gallon equals 6.377551e-7 stones per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per cup?
Stone per Cup (st/cup) is a unit of density.
What is a grain per gallon?
Grain per Gallon (gr/gal) is a unit of density.
Is the stone per cup to grain per gallon conversion exact?
Yes. Both stone per cup and grain per gallon are defined by fixed standards rather than physical artifacts, so the factor of 1568000 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.