Mass per volume density.
Stones per Quart to Pounds per Cubic foot Converter — st/qt to lb/ft3
Convert Stone per Quart (st/qt) to Pound per Cubic foot (lb/ft3) using the exact conversion factor (1 stone per quart = 418.9090909 pound per cubic foot). See the formula, worked examples, conversion table, and common uses.
Stones per Quart to Pounds per Cubic foot 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 / 16.01846337.
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 Cubic foot
Stone per Quart and Pound per Cubic foot 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 cubic foot = stones per quart × 418.909090909
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 cubic foot equals 16.018463374 base units, so dividing one by the other gives the direct stone per quart-to-pound per cubic foot factor of 418.909090909.
Simple example
1 st/qt × 418.9090909 = 418.9090909 lb/ft3
1 stone per quart = 418.9090909 pounds per cubic foot.
Real-world example
1,000 st/qt × 418.9090909 = 418,909.0909 lb/ft3
1,000 stones per quart = 418,909.0909 pounds per cubic foot.
Conversion table
| Stone per Quart (st/qt) | Pound per Cubic foot (lb/ft3) |
|---|---|
| 0.1 st/qt | 41.89090909 lb/ft3 |
| 1 st/qt | 418.9090909 lb/ft3 |
| 10 st/qt | 4,189.090909 lb/ft3 |
| 100 st/qt | 41,890.90909 lb/ft3 |
| 1,000 st/qt | 418,909.0909 lb/ft3 |
| 10,000 st/qt | 4,189,090.909 lb/ft3 |
Reverse conversion: Pound per Cubic foot to Stone per Quart
418.9090909 lb/ft3 × 0.002387152778 = 1 st/qt
418.9090909 pounds per cubic foot = 1 stones per quart.
stones per quart = pounds per cubic foot × 0.00238715277778
For a page dedicated to this direction, see Pound per Cubic foot to Stone per Quart.
Understanding the Stone per Quart (st/qt)
Mass per volume density.
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
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 pounds per cubic foot are in 1 stone per quart?
1 stone per quart equals 418.9090909 pounds per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert stone per quart to pound per cubic foot?
Multiply the stone per quart value by 418.9090909. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic foot back to stone per quart?
Use the reverse factor: 1 pound per cubic foot equals 0.0023871528 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 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.
Is the stone per quart to pound per cubic foot conversion exact?
Yes. Both stone per quart and pound per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 418.9090909 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.