Mass per volume density.
Pound per Cubic inches to Stones per Imperial gallon Converter — lb/in3 to st/imp gal
Convert Pound per Cubic inch (lb/in3) to Stone per Imperial gallon (st/imp gal) using the exact conversion factor (1 pound per cubic inch = 19.81567377 stone per imperial gallon). See the formula, worked examples, conversion table, and common uses.
Pound per Cubic inches to Stones per Imperial gallon 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 27679.90471 / 1396.869217.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pound per Cubic inches to Stones per Imperial gallon
Pound per Cubic inch and Stone per Imperial gallon 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 inch is most often used for used in machining and materials engineering, particularly for describing the density of metals, where a smaller volume unit than the cubic foot gives a more convenient figure.
Formula
stones per imperial gallon = pound per cubic inches × 19.8156737708
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cubic inch equals 27679.9047102 base units, and 1 stone per imperial gallon equals 1396.86921728 base units, so dividing one by the other gives the direct pound per cubic inch-to-stone per imperial gallon factor of 19.8156737708.
Simple example
1 lb/in3 × 19.81567377 = 19.81567377 st/imp gal
1 pound per cubic inch = 19.81567377 stones per imperial gallon.
Real-world example
1,000 lb/in3 × 19.81567377 = 19,815.67377 st/imp gal
1,000 pound per cubic inches = 19,815.67377 stones per imperial gallon.
Conversion table
| Pound per Cubic inch (lb/in3) | Stone per Imperial gallon (st/imp gal) |
|---|---|
| 0.1 lb/in3 | 1.981567377 st/imp gal |
| 1 lb/in3 | 19.81567377 st/imp gal |
| 10 lb/in3 | 198.1567377 st/imp gal |
| 100 lb/in3 | 1,981.567377 st/imp gal |
| 1,000 lb/in3 | 19,815.67377 st/imp gal |
| 10,000 lb/in3 | 198,156.7377 st/imp gal |
Reverse conversion: Stone per Imperial gallon to Pound per Cubic inch
19.81567377 st/imp gal × 0.0504651021 = 1 lb/in3
19.81567377 stones per imperial gallon = 1 pound per cubic inches.
pound per cubic inches = stones per imperial gallon × 0.0504651020987
For a page dedicated to this direction, see Stone per Imperial gallon to Pound per Cubic inch.
Understanding the Pound per Cubic inch
Pound per Cubic inch (lb/in3) measures density. A US customary density unit suited to describing dense materials in a small volume. It is classified as a US customary density unit.
Where it's used: United States
Uses of the Pound per Cubic inch today
- Used in machining and materials engineering, particularly for describing the density of metals, where a smaller volume unit than the cubic foot gives a more convenient figure
Understanding the Stone per Imperial gallon (st/imp gal)
Mass per volume density.
Pound per Cubic inch — sources
- US materials-engineering reference tables — Pounds per cubic inch is a commonly tabulated density unit for metals in US machining and materials references.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per imperial gallon are in 1 pound per cubic inch?
1 pound per cubic inch equals 19.81567377 stones per imperial gallon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic inch to stone per imperial gallon?
Multiply the pound per cubic inch value by 19.81567377. The converter above does this instantly to whatever precision you set.
How do I convert stone per imperial gallon back to pound per cubic inch?
Use the reverse factor: 1 stone per imperial gallon equals 0.0504651021 pound per cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per cubic inch?
Pound per Cubic inch (lb/in3) measures density. A US customary density unit suited to describing dense materials in a small volume. It is classified as a US customary density unit.
What is a stone per imperial gallon?
Stone per Imperial gallon (st/imp gal) is a unit of density.
Is the pound per cubic inch to stone per imperial gallon conversion exact?
Yes. Both pound per cubic inch and stone per imperial gallon are defined by fixed standards rather than physical artifacts, so the factor of 19.81567377 used above is exact to as many digits as you choose to display.
Where is the pound per cubic inch still used today?
United States
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.