Mass per volume density.
Stone per Cubic inches to Pounds per Cup Converter — st/in3 to lb/cup
Convert Stone per Cubic inch (st/in3) to Pound per Cup (lb/cup) using the exact conversion factor (1 stone per cubic inch = 202.125 pound per cup). See the formula, worked examples, and conversion table.
Stone per Cubic inches 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 387518.6659 / 1917.222837.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stone per Cubic inches to Pounds per Cup
Stone per Cubic inch 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 = stone per cubic inches × 202.125
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per cubic inch equals 387518.665943 base units, and 1 pound per cup equals 1917.22283707 base units, so dividing one by the other gives the direct stone per cubic inch-to-pound per cup factor of 202.125.
Simple example
1 st/in3 × 202.125 = 202.125 lb/cup
1 stone per cubic inch = 202.125 pounds per cup.
Real-world example
1,000 st/in3 × 202.125 = 202,125 lb/cup
1,000 stone per cubic inches = 202,125 pounds per cup.
Conversion table
| Stone per Cubic inch (st/in3) | Pound per Cup (lb/cup) |
|---|---|
| 0.1 st/in3 | 20.2125 lb/cup |
| 1 st/in3 | 202.125 lb/cup |
| 10 st/in3 | 2,021.25 lb/cup |
| 100 st/in3 | 20,212.5 lb/cup |
| 1,000 st/in3 | 202,125 lb/cup |
| 10,000 st/in3 | 2,021,250 lb/cup |
Reverse conversion: Pound per Cup to Stone per Cubic inch
202.125 lb/cup × 0.004947433519 = 1 st/in3
202.125 pounds per cup = 1 stone per cubic inches.
stone per cubic inches = pounds per cup × 0.00494743351886
For a page dedicated to this direction, see Pound per Cup to Stone per Cubic inch.
Understanding the Stone per Cubic inch (st/in3)
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 cubic inch?
1 stone per cubic inch equals 202.125 pounds per cup, using the exact defined conversion factor rather than an estimate.
How do I convert stone per cubic inch to pound per cup?
Multiply the stone per cubic inch value by 202.125. The converter above does this instantly to whatever precision you set.
How do I convert pound per cup back to stone per cubic inch?
Use the reverse factor: 1 pound per cup equals 0.0049474335 stone per cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per cubic inch?
Stone per Cubic inch (st/in3) 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 cubic inch to pound per cup conversion exact?
Yes. Both stone per cubic inch and pound per cup are defined by fixed standards rather than physical artifacts, so the factor of 202.125 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.