Mass per volume density.
Pounds per Cubic foot to Stones per Quart Converter — lb/ft3 to st/qt
Convert Pound per Cubic foot (lb/ft3) to Stone per Quart (st/qt) using the exact conversion factor (1 pound per cubic foot = 0.0023871528 stone per quart). See the formula, worked examples, conversion table, and common uses.
Pounds per Cubic foot to Stones per Quart 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 16.01846337 / 6710.27993.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Cubic foot to Stones per Quart
Pound per Cubic foot and Stone per Quart 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. Pound per Cubic foot is most often used for us construction material density specs (concrete, soil, lumber, insulation).
Formula
stones per quart = pounds per cubic foot × 0.00238715277778
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cubic foot equals 16.018463374 base units, and 1 stone per quart equals 6710.27992975 base units, so dividing one by the other gives the direct pound per cubic foot-to-stone per quart factor of 0.00238715277778.
Simple example
1 lb/ft3 × 0.002387152778 = 0.0023871528 st/qt
1 pound per cubic foot = 0.0023871528 stones per quart.
Real-world example
1,000 lb/ft3 × 0.002387152778 = 2.387152778 st/qt
1,000 pounds per cubic foot = 2.387152778 stones per quart.
Conversion table
| Pound per Cubic foot (lb/ft3) | Stone per Quart (st/qt) |
|---|---|
| 0.1 lb/ft3 | 0.0002387153 st/qt |
| 1 lb/ft3 | 0.0023871528 st/qt |
| 10 lb/ft3 | 0.0238715278 st/qt |
| 100 lb/ft3 | 0.2387152778 st/qt |
| 1,000 lb/ft3 | 2.387152778 st/qt |
| 10,000 lb/ft3 | 23.87152778 st/qt |
Reverse conversion: Stone per Quart to Pound per Cubic foot
0.0023871528 st/qt × 418.9090909 = 1.000000009 lb/ft3
0.0023871528 stones per quart = 1.000000009 pounds per cubic foot.
pounds per cubic foot = stones per quart × 418.909090909
For a page dedicated to this direction, see Stone per Quart to Pound per Cubic foot.
Understanding the Pound per Cubic foot
Pound per Cubic foot (lb/ft3) measures density. The US customary unit for expressing density, commonly used in construction and engineering material specifications. It is classified as a US customary density unit.
Where it's used: United States (construction, engineering, materials specifications)
Uses of the Pound per Cubic foot today
- US construction material density specs (concrete, soil, lumber, insulation)
- US engineering material property tables
- Bulk material handling and shipping weight estimates
Understanding the Stone per Quart (st/qt)
Mass per volume density.
Pound per Cubic foot — sources
- NIST Handbook 44 — General tables of units including US customary density measures.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per quart are in 1 pound per cubic foot?
1 pound per cubic foot equals 0.0023871528 stones per quart, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic foot to stone per quart?
Multiply the pound per cubic foot value by 0.002387152778. The converter above does this instantly to whatever precision you set.
How do I convert stone per quart back to pound per cubic foot?
Use the reverse factor: 1 stone per quart equals 418.9090909 pounds per cubic foot. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per cubic foot?
Pound per Cubic foot (lb/ft3) measures density. The US customary unit for expressing density, commonly used in construction and engineering material specifications. It is classified as a US customary density unit.
What is a stone per quart?
Stone per Quart (st/qt) is a unit of density.
Is the pound per cubic foot to stone per quart conversion exact?
Yes. Both pound per cubic foot and stone per quart are defined by fixed standards rather than physical artifacts, so the factor of 0.002387152778 used above is exact to as many digits as you choose to display.
Where is the pound per cubic foot still used today?
United States (construction, engineering, materials specifications)
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.