Mass per volume density.
Imperial hundredweights per Cup to Stones per Gallon Converter — long cwt/cup to st/gal
Convert Imperial hundredweight per Cup (long cwt/cup) to Stone per Gallon (st/gal) using the exact conversion factor (1 imperial hundredweight per cup = 128 stone per gallon). See the formula, worked examples, and conversion table.
Imperial hundredweights 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 214728.9578 / 1677.569982.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial hundredweights per Cup to Stones per Gallon
Imperial hundredweight 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 = imperial hundredweights per cup × 128
This factor comes from each unit's defined relationship to the category's base unit: 1 imperial hundredweight per cup equals 214728.957752 base units, and 1 stone per gallon equals 1677.56998244 base units, so dividing one by the other gives the direct imperial hundredweight per cup-to-stone per gallon factor of 128.
Simple example
1 long cwt/cup × 128 = 128 st/gal
1 imperial hundredweight per cup = 128 stones per gallon.
Real-world example
1,000 long cwt/cup × 128 = 128,000 st/gal
1,000 imperial hundredweights per cup = 128,000 stones per gallon.
Conversion table
| Imperial hundredweight per Cup (long cwt/cup) | Stone per Gallon (st/gal) |
|---|---|
| 0.1 long cwt/cup | 12.8 st/gal |
| 1 long cwt/cup | 128 st/gal |
| 10 long cwt/cup | 1,280 st/gal |
| 100 long cwt/cup | 12,800 st/gal |
| 1,000 long cwt/cup | 128,000 st/gal |
| 10,000 long cwt/cup | 1,280,000 st/gal |
Reverse conversion: Stone per Gallon to Imperial hundredweight per Cup
128 st/gal × 0.0078125 = 1 long cwt/cup
128 stones per gallon = 1 imperial hundredweight per cup.
imperial hundredweights per cup = stones per gallon × 0.0078125
For a page dedicated to this direction, see Stone per Gallon to Imperial hundredweight per Cup.
Understanding the Imperial hundredweight per Cup (long cwt/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 imperial hundredweight per cup?
1 imperial hundredweight per cup equals 128 stones per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert imperial hundredweight per cup to stone per gallon?
Multiply the imperial hundredweight per cup value by 128. The converter above does this instantly to whatever precision you set.
How do I convert stone per gallon back to imperial hundredweight per cup?
Use the reverse factor: 1 stone per gallon equals 0.0078125 imperial hundredweights per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a imperial hundredweight per cup?
Imperial hundredweight per Cup (long cwt/cup) is a unit of density.
What is a stone per gallon?
Stone per Gallon (st/gal) is a unit of density.
Is the imperial hundredweight per cup to stone per gallon conversion exact?
Yes. Both imperial hundredweight per cup and stone per gallon are defined by fixed standards rather than physical artifacts, so the factor of 128 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.