Mass per volume density.
Stones per Gallon to Pounds per Cup Converter — st/gal to lb/cup
Convert Stone per Gallon (st/gal) to Pound per Cup (lb/cup) using the exact conversion factor (1 stone per gallon = 0.875 pound per cup). See the formula, worked examples, and conversion table.
Stones per Gallon to Pounds per Cup 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 1677.569982 / 1917.222837.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Gallon to Pounds per Cup
Stone per Gallon and Pound per Cup 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
pounds per cup = stones per gallon × 0.875
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per gallon equals 1677.56998244 base units, and 1 pound per cup equals 1917.22283707 base units, so dividing one by the other gives the direct stone per gallon-to-pound per cup factor of 0.875.
Simple example
1 st/gal × 0.875 = 0.875 lb/cup
1 stone per gallon = 0.875 pounds per cup.
Real-world example
1,000 st/gal × 0.875 = 875 lb/cup
1,000 stones per gallon = 875 pounds per cup.
Conversion table
| Stone per Gallon (st/gal) | Pound per Cup (lb/cup) |
|---|---|
| 0.1 st/gal | 0.0875 lb/cup |
| 1 st/gal | 0.875 lb/cup |
| 10 st/gal | 8.75 lb/cup |
| 100 st/gal | 87.5 lb/cup |
| 1,000 st/gal | 875 lb/cup |
| 10,000 st/gal | 8,750 lb/cup |
Reverse conversion: Pound per Cup to Stone per Gallon
0.875 lb/cup × 1.142857143 = 1 st/gal
0.875 pounds per cup = 1 stone per gallon.
stones per gallon = pounds per cup × 1.14285714286
For a page dedicated to this direction, see Pound per Cup to Stone per Gallon.
Understanding the Stone per Gallon (st/gal)
Mass per volume density.
Understanding the Pound per Cup (lb/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per cup are in 1 stone per gallon?
1 stone per gallon equals 0.875 pounds per cup, using the exact defined conversion factor rather than an estimate.
How do I convert stone per gallon to pound per cup?
Multiply the stone per gallon value by 0.875. The converter above does this instantly to whatever precision you set.
How do I convert pound per cup back to stone per gallon?
Use the reverse factor: 1 pound per cup equals 1.142857143 stones per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per gallon?
Stone per Gallon (st/gal) is a unit of density.
What is a pound per cup?
Pound per Cup (lb/cup) is a unit of density.
Is the stone per gallon to pound per cup conversion exact?
Yes. Both stone per gallon and pound per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.875 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.