Mass per volume density.
Pounds per Gallon to Stone per Cubic inches Converter — lb/gal to st/in3
Convert Pound per Gallon (lb/gal) to Stone per Cubic inch (st/in3) using the exact conversion factor (1 pound per gallon = 0.0003092146 stone per cubic inch). See the formula, worked examples, conversion table, and common uses.
Pounds per Gallon to Stone per Cubic inches 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 119.8264273 / 387518.6659.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Gallon to Stone per Cubic inches
Pound per Gallon and Stone per Cubic inch 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 Gallon is most often used for us paint and coatings density specifications.
Formula
stone per cubic inches = pounds per gallon × 0.000309214594929
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per gallon equals 119.826427317 base units, and 1 stone per cubic inch equals 387518.665943 base units, so dividing one by the other gives the direct pound per gallon-to-stone per cubic inch factor of 0.000309214594929.
Simple example
1 lb/gal × 0.0003092145949 = 0.0003092146 st/in3
1 pound per gallon = 0.0003092146 stone per cubic inches.
Real-world example
1,000 lb/gal × 0.0003092145949 = 0.3092145949 st/in3
1,000 pounds per gallon = 0.3092145949 stone per cubic inches.
Conversion table
| Pound per Gallon (lb/gal) | Stone per Cubic inch (st/in3) |
|---|---|
| 0.1 lb/gal | 0.0000309215 st/in3 |
| 1 lb/gal | 0.0003092146 st/in3 |
| 10 lb/gal | 0.0030921459 st/in3 |
| 100 lb/gal | 0.0309214595 st/in3 |
| 1,000 lb/gal | 0.3092145949 st/in3 |
| 10,000 lb/gal | 3.092145949 st/in3 |
Reverse conversion: Stone per Cubic inch to Pound per Gallon
0.0003092146 st/in3 × 3234 = 1.000000016 lb/gal
0.0003092146 stone per cubic inches = 1.000000016 pounds per gallon.
pounds per gallon = stone per cubic inches × 3234
For a page dedicated to this direction, see Stone per Cubic inch to Pound per Gallon.
Understanding the Pound per Gallon
Pound per Gallon (lb/gal) measures density. The US customary unit for liquid density, based on the US gallon (231 cubic inches). It is classified as a US customary density unit.
Where it's used: United States (paint, fuel, and industrial liquid density specifications)
lb/gal vs. lb/ft³. Both are US customary density units; they're related through the real, fixed relationship between the US gallon and the cubic foot (1 cubic foot ≈ 7.48 US gallons), not a round conversion factor.
Uses of the Pound per Gallon today
- US paint and coatings density specifications
- US fuel and petroleum liquid density specs
- Industrial liquid handling and shipping weight calculations
Understanding the Stone per Cubic inch (st/in3)
Mass per volume density.
Pound per Gallon — 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 stone per cubic inches are in 1 pound per gallon?
1 pound per gallon equals 0.0003092146 stone per cubic inches, using the exact defined conversion factor rather than an estimate.
How do I convert pound per gallon to stone per cubic inch?
Multiply the pound per gallon value by 0.0003092145949. The converter above does this instantly to whatever precision you set.
How do I convert stone per cubic inch back to pound per gallon?
Use the reverse factor: 1 stone per cubic inch equals 3,234 pounds per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per gallon?
Pound per Gallon (lb/gal) measures density. The US customary unit for liquid density, based on the US gallon (231 cubic inches). It is classified as a US customary density unit.
What is a stone per cubic inch?
Stone per Cubic inch (st/in3) is a unit of density.
Is the pound per gallon to stone per cubic inch conversion exact?
Yes. Both pound per gallon and stone per cubic inch are defined by fixed standards rather than physical artifacts, so the factor of 0.0003092145949 used above is exact to as many digits as you choose to display.
What is the difference between lb/gal vs. lb/ft³?
Both are US customary density units; they're related through the real, fixed relationship between the US gallon and the cubic foot (1 cubic foot ≈ 7.48 US gallons), not a round conversion factor.
Where is the pound per gallon still used today?
United States (paint, fuel, and industrial liquid density specifications)