Mass per volume density.
Pounds per Gallon to Pound per Cubic inches Converter — lb/gal to lb/in3
Convert Pound per Gallon (lb/gal) to Pound per Cubic inch (lb/in3) using the exact conversion factor (1 pound per gallon = 0.0043290043 pound per cubic inch). See the formula, worked examples, conversion table, unit comparison, and common uses.
Pounds per Gallon to Pound 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 / 27679.90471.
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 Pound per Cubic inches
Pound per Gallon and Pound 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 typically associated with united States (paint, fuel, and industrial liquid density specifications), while Pound per Cubic inch is typically associated with united States.
Formula
pound per cubic inches = pounds per gallon × 0.004329004329
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 pound per cubic inch equals 27679.9047102 base units, so dividing one by the other gives the direct pound per gallon-to-pound per cubic inch factor of 0.004329004329.
Simple example
1 lb/gal × 0.004329004329 = 0.0043290043 lb/in3
1 pound per gallon = 0.0043290043 pound per cubic inches.
Real-world example
1,000 lb/gal × 0.004329004329 = 4.329004329 lb/in3
1,000 pounds per gallon = 4.329004329 pound per cubic inches.
Conversion table
| Pound per Gallon (lb/gal) | Pound per Cubic inch (lb/in3) |
|---|---|
| 0.1 lb/gal | 0.0004329004 lb/in3 |
| 1 lb/gal | 0.0043290043 lb/in3 |
| 10 lb/gal | 0.0432900433 lb/in3 |
| 100 lb/gal | 0.4329004329 lb/in3 |
| 1,000 lb/gal | 4.329004329 lb/in3 |
| 10,000 lb/gal | 43.29004329 lb/in3 |
Reverse conversion: Pound per Cubic inch to Pound per Gallon
0.0043290043 lb/in3 × 231 = 0.9999999933 lb/gal
0.0043290043 pound per cubic inches = 0.9999999933 pounds per gallon.
pounds per gallon = pound per cubic inches × 231
For a page dedicated to this direction, see Pound per Cubic inch to Pound per Gallon.
Pound per Gallon vs. Pound per Cubic inch
| Aspect | Pound per Gallon | Pound per Cubic inch |
|---|---|---|
| Family | US customary density unit | US customary density unit |
| Typical use | US paint and coatings density specifications | 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 |
| Where it's used | United States (paint, fuel, and industrial liquid density specifications) | United States |
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 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
Pound per Gallon — sources
- NIST Handbook 44 — General tables of units including US customary density measures.
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 pound per cubic inches are in 1 pound per gallon?
1 pound per gallon equals 0.0043290043 pound per cubic inches, using the exact defined conversion factor rather than an estimate.
How do I convert pound per gallon to pound per cubic inch?
Multiply the pound per gallon value by 0.004329004329. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic inch back to pound per gallon?
Use the reverse factor: 1 pound per cubic inch equals 231 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 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.
Is the pound per gallon to pound per cubic inch conversion exact?
Yes. Both pound per gallon and pound per cubic inch are defined by fixed standards rather than physical artifacts, so the factor of 0.004329004329 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)