Mass per volume density.
Pound per Cubic inches to Kilograms per Imperial gallon Converter — lb/in3 to kg/imp gal
Convert Pound per Cubic inch (lb/in3) to Kilogram per Imperial gallon (kg/imp gal) using the exact conversion factor (1 pound per cubic inch = 125.835338 kilogram per imperial gallon). See the formula, worked examples, conversion table, unit comparison, and common uses.
Pound per Cubic inches to Kilograms 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 / 219.9692483.
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 Kilograms per Imperial gallon
Pound per Cubic inch and Kilogram 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
kilograms per imperial gallon = pound per cubic inches × 125.835338004
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 kilogram per imperial gallon equals 219.969248299 base units, so dividing one by the other gives the direct pound per cubic inch-to-kilogram per imperial gallon factor of 125.835338004.
Simple example
1 lb/in3 × 125.835338 = 125.835338 kg/imp gal
1 pound per cubic inch = 125.835338 kilograms per imperial gallon.
Real-world example
1,000 lb/in3 × 125.835338 = 125,835.338 kg/imp gal
1,000 pound per cubic inches = 125,835.338 kilograms per imperial gallon.
Conversion table
| Pound per Cubic inch (lb/in3) | Kilogram per Imperial gallon (kg/imp gal) |
|---|---|
| 0.1 lb/in3 | 12.5835338 kg/imp gal |
| 1 lb/in3 | 125.835338 kg/imp gal |
| 10 lb/in3 | 1,258.35338 kg/imp gal |
| 100 lb/in3 | 12,583.5338 kg/imp gal |
| 1,000 lb/in3 | 125,835.338 kg/imp gal |
| 10,000 lb/in3 | 1,258,353.38 kg/imp gal |
Reverse conversion: Kilogram per Imperial gallon to Pound per Cubic inch
125.835338 kg/imp gal × 0.007946893264 = 1 lb/in3
125.835338 kilograms per imperial gallon = 1 pound per cubic inches.
pound per cubic inches = kilograms per imperial gallon × 0.00794689326434
For a page dedicated to this direction, see Kilogram per Imperial gallon to Pound per Cubic inch.
Pound per Cubic inch vs. Kilogram per Imperial gallon
| Aspect | Pound per Cubic inch | Kilogram per Imperial gallon |
|---|---|---|
| Family | US customary density unit | mixed metric/UK customary density unit |
| Typical use | 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 | Can be used to express liquid density in UK/Commonwealth contexts that reference the imperial gallon — in practice, kilograms per liter is the more commonly seen metric density unit even in these regions |
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 Kilogram per Imperial gallon
Kilogram per Imperial gallon (kg/imp gal) measures density. A mathematically valid way to express liquid density in kilograms per imperial gallon. It is classified as a mixed metric/UK customary density unit.
Uses of the Kilogram per Imperial gallon today
- Can be used to express liquid density in UK/Commonwealth contexts that reference the imperial gallon — in practice, kilograms per liter is the more commonly seen metric density unit even in these regions
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.
Kilogram per Imperial gallon — sources
- UK/Commonwealth liquid-measurement references — The imperial gallon remains in some UK/Commonwealth commercial use, but liquid density is more commonly quoted in kilograms per liter.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilograms per imperial gallon are in 1 pound per cubic inch?
1 pound per cubic inch equals 125.835338 kilograms per imperial gallon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic inch to kilogram per imperial gallon?
Multiply the pound per cubic inch value by 125.835338. The converter above does this instantly to whatever precision you set.
How do I convert kilogram per imperial gallon back to pound per cubic inch?
Use the reverse factor: 1 kilogram per imperial gallon equals 0.0079468933 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 kilogram per imperial gallon?
Kilogram per Imperial gallon (kg/imp gal) measures density. A mathematically valid way to express liquid density in kilograms per imperial gallon. It is classified as a mixed metric/UK customary density unit.
Is the pound per cubic inch to kilogram per imperial gallon conversion exact?
Yes. Both pound per cubic inch and kilogram per imperial gallon are defined by fixed standards rather than physical artifacts, so the factor of 125.835338 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.