Mass per volume density.
Pounds per Gallon to Hectograms per Gallon Converter — lb/gal to hg/gal
Convert Pound per Gallon (lb/gal) to Hectogram per Gallon (hg/gal) using the exact conversion factor (1 pound per gallon = 4.5359237 hectogram per gallon). See the formula, worked examples, conversion table, and common uses.
Pounds per Gallon to Hectograms per 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 119.8264273 / 26.41720524.
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 Hectograms per Gallon
Pound per Gallon and Hectogram per 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 Gallon is most often used for us paint and coatings density specifications.
Formula
hectograms per gallon = pounds per gallon × 4.5359237
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 hectogram per gallon equals 26.4172052358 base units, so dividing one by the other gives the direct pound per gallon-to-hectogram per gallon factor of 4.5359237.
Simple example
1 lb/gal × 4.5359237 = 4.5359237 hg/gal
1 pound per gallon = 4.5359237 hectograms per gallon.
Real-world example
1,000 lb/gal × 4.5359237 = 4,535.9237 hg/gal
1,000 pounds per gallon = 4,535.9237 hectograms per gallon.
Conversion table
| Pound per Gallon (lb/gal) | Hectogram per Gallon (hg/gal) |
|---|---|
| 0.1 lb/gal | 0.45359237 hg/gal |
| 1 lb/gal | 4.5359237 hg/gal |
| 10 lb/gal | 45.359237 hg/gal |
| 100 lb/gal | 453.59237 hg/gal |
| 1,000 lb/gal | 4,535.9237 hg/gal |
| 10,000 lb/gal | 45,359.237 hg/gal |
Reverse conversion: Hectogram per Gallon to Pound per Gallon
4.5359237 hg/gal × 0.2204622622 = 1 lb/gal
4.5359237 hectograms per gallon = 1 pounds per gallon.
pounds per gallon = hectograms per gallon × 0.220462262185
For a page dedicated to this direction, see Hectogram per Gallon 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 Hectogram per Gallon (hg/gal)
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 hectograms per gallon are in 1 pound per gallon?
1 pound per gallon equals 4.5359237 hectograms per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per gallon to hectogram per gallon?
Multiply the pound per gallon value by 4.5359237. The converter above does this instantly to whatever precision you set.
How do I convert hectogram per gallon back to pound per gallon?
Use the reverse factor: 1 hectogram per gallon equals 0.2204622622 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 hectogram per gallon?
Hectogram per Gallon (hg/gal) is a unit of density.
Is the pound per gallon to hectogram per gallon conversion exact?
Yes. Both pound per gallon and hectogram per gallon are defined by fixed standards rather than physical artifacts, so the factor of 4.5359237 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)