Mass per volume density.
Pound per Cubic inches to Pounds per Imperial gallon Converter — lb/in3 to lb/imp gal
Convert Pound per Cubic inch (lb/in3) to Pound per Imperial gallon (lb/imp gal) using the exact conversion factor (1 pound per cubic inch = 277.4194328 pound per imperial gallon). See the formula, worked examples, conversion table, and common uses.
Pound per Cubic inches to Pounds 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 / 99.77637266.
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 Pounds per Imperial gallon
Pound per Cubic inch and Pound 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
pounds per imperial gallon = pound per cubic inches × 277.419432792
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 pound per imperial gallon equals 99.7763726631 base units, so dividing one by the other gives the direct pound per cubic inch-to-pound per imperial gallon factor of 277.419432792.
Simple example
1 lb/in3 × 277.4194328 = 277.4194328 lb/imp gal
1 pound per cubic inch = 277.4194328 pounds per imperial gallon.
Real-world example
1,000 lb/in3 × 277.4194328 = 277,419.4328 lb/imp gal
1,000 pound per cubic inches = 277,419.4328 pounds per imperial gallon.
Conversion table
| Pound per Cubic inch (lb/in3) | Pound per Imperial gallon (lb/imp gal) |
|---|---|
| 0.1 lb/in3 | 27.74194328 lb/imp gal |
| 1 lb/in3 | 277.4194328 lb/imp gal |
| 10 lb/in3 | 2,774.194328 lb/imp gal |
| 100 lb/in3 | 27,741.94328 lb/imp gal |
| 1,000 lb/in3 | 277,419.4328 lb/imp gal |
| 10,000 lb/in3 | 2,774,194.328 lb/imp gal |
Reverse conversion: Pound per Imperial gallon to Pound per Cubic inch
277.4194328 lb/imp gal × 0.00360465015 = 1 lb/in3
277.4194328 pounds per imperial gallon = 1 pound per cubic inches.
pound per cubic inches = pounds per imperial gallon × 0.00360465014991
For a page dedicated to this direction, see Pound 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 Pound per Imperial gallon (lb/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 pounds per imperial gallon are in 1 pound per cubic inch?
1 pound per cubic inch equals 277.4194328 pounds per imperial gallon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic inch to pound per imperial gallon?
Multiply the pound per cubic inch value by 277.4194328. The converter above does this instantly to whatever precision you set.
How do I convert pound per imperial gallon back to pound per cubic inch?
Use the reverse factor: 1 pound per imperial gallon equals 0.0036046502 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 pound per imperial gallon?
Pound per Imperial gallon (lb/imp gal) is a unit of density.
Is the pound per cubic inch to pound per imperial gallon conversion exact?
Yes. Both pound per cubic inch and pound per imperial gallon are defined by fixed standards rather than physical artifacts, so the factor of 277.4194328 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.