Mass per volume density.
Stones per Imperial gallon to Pounds per Cubic foot Converter — st/imp gal to lb/ft3
Convert Stone per Imperial gallon (st/imp gal) to Pound per Cubic foot (lb/ft3) using the exact conversion factor (1 stone per imperial gallon = 87.20369643 pound per cubic foot). See the formula, worked examples, conversion table, and common uses.
Stones per Imperial gallon 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 1396.869217 / 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 Imperial gallon to Pounds per Cubic foot
Stone per Imperial gallon 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 imperial gallon × 87.2036964266
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per imperial gallon equals 1396.86921728 base units, and 1 pound per cubic foot equals 16.018463374 base units, so dividing one by the other gives the direct stone per imperial gallon-to-pound per cubic foot factor of 87.2036964266.
Simple example
1 st/imp gal × 87.20369643 = 87.20369643 lb/ft3
1 stone per imperial gallon = 87.20369643 pounds per cubic foot.
Real-world example
1,000 st/imp gal × 87.20369643 = 87,203.69643 lb/ft3
1,000 stones per imperial gallon = 87,203.69643 pounds per cubic foot.
Conversion table
| Stone per Imperial gallon (st/imp gal) | Pound per Cubic foot (lb/ft3) |
|---|---|
| 0.1 st/imp gal | 8.720369643 lb/ft3 |
| 1 st/imp gal | 87.20369643 lb/ft3 |
| 10 st/imp gal | 872.0369643 lb/ft3 |
| 100 st/imp gal | 8,720.369643 lb/ft3 |
| 1,000 st/imp gal | 87,203.69643 lb/ft3 |
| 10,000 st/imp gal | 872,036.9643 lb/ft3 |
Reverse conversion: Pound per Cubic foot to Stone per Imperial gallon
87.20369643 lb/ft3 × 0.0114674038 = 1 st/imp gal
87.20369643 pounds per cubic foot = 1 stones per imperial gallon.
stones per imperial gallon = pounds per cubic foot × 0.0114674038026
For a page dedicated to this direction, see Pound per Cubic foot to Stone per Imperial gallon.
Understanding the Stone per Imperial gallon (st/imp gal)
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 imperial gallon?
1 stone per imperial gallon equals 87.20369643 pounds per cubic foot, using the exact defined conversion factor rather than an estimate.
How do I convert stone per imperial gallon to pound per cubic foot?
Multiply the stone per imperial gallon value by 87.20369643. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic foot back to stone per imperial gallon?
Use the reverse factor: 1 pound per cubic foot equals 0.0114674038 stones per imperial gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per imperial gallon?
Stone per Imperial gallon (st/imp gal) 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 imperial gallon to pound per cubic foot conversion exact?
Yes. Both stone per imperial gallon and pound per cubic foot are defined by fixed standards rather than physical artifacts, so the factor of 87.20369643 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.