Mass per volume density.
Stones per Quart to Pounds per Cup Converter — st/qt to lb/cup
Convert Stone per Quart (st/qt) to Pound per Cup (lb/cup) using the exact conversion factor (1 stone per quart = 3.5 pound per cup). See the formula, worked examples, and conversion table.
Stones per Quart 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 6710.27993 / 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 Quart to Pounds per Cup
Stone per Quart 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 quart × 3.5
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per quart equals 6710.27992975 base units, and 1 pound per cup equals 1917.22283707 base units, so dividing one by the other gives the direct stone per quart-to-pound per cup factor of 3.5.
Simple example
1 st/qt × 3.5 = 3.5 lb/cup
1 stone per quart = 3.5 pounds per cup.
Real-world example
1,000 st/qt × 3.5 = 3,500 lb/cup
1,000 stones per quart = 3,500 pounds per cup.
Conversion table
| Stone per Quart (st/qt) | Pound per Cup (lb/cup) |
|---|---|
| 0.1 st/qt | 0.35 lb/cup |
| 1 st/qt | 3.5 lb/cup |
| 10 st/qt | 35 lb/cup |
| 100 st/qt | 350 lb/cup |
| 1,000 st/qt | 3,500 lb/cup |
| 10,000 st/qt | 35,000 lb/cup |
Reverse conversion: Pound per Cup to Stone per Quart
3.5 lb/cup × 0.2857142857 = 1 st/qt
3.5 pounds per cup = 1 stone per quart.
stones per quart = pounds per cup × 0.285714285714
For a page dedicated to this direction, see Pound per Cup to Stone per Quart.
Understanding the Stone per Quart (st/qt)
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 quart?
1 stone per quart equals 3.5 pounds per cup, using the exact defined conversion factor rather than an estimate.
How do I convert stone per quart to pound per cup?
Multiply the stone per quart value by 3.5. The converter above does this instantly to whatever precision you set.
How do I convert pound per cup back to stone per quart?
Use the reverse factor: 1 pound per cup equals 0.2857142857 stones per quart. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per quart?
Stone per Quart (st/qt) 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 quart to pound per cup conversion exact?
Yes. Both stone per quart and pound per cup are defined by fixed standards rather than physical artifacts, so the factor of 3.5 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.