Mass per volume density.
Hectograms per Cup to Pounds per Gallon Converter — hg/cup to lb/gal
Convert Hectogram per Cup (hg/cup) to Pound per Gallon (lb/gal) using the exact conversion factor (1 hectogram per cup = 3.527396195 pound per gallon). See the formula, worked examples, conversion table, and common uses.
Hectograms per Cup to Pounds 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 422.6752838 / 119.8264273.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Hectograms per Cup to Pounds per Gallon
Hectogram per Cup and Pound 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. Both are mass per volume density units.
Formula
pounds per gallon = hectograms per cup × 3.52739619496
This factor comes from each unit's defined relationship to the category's base unit: 1 hectogram per cup equals 422.675283773 base units, and 1 pound per gallon equals 119.826427317 base units, so dividing one by the other gives the direct hectogram per cup-to-pound per gallon factor of 3.52739619496.
Simple example
1 hg/cup × 3.527396195 = 3.527396195 lb/gal
1 hectogram per cup = 3.527396195 pounds per gallon.
Real-world example
1,000 hg/cup × 3.527396195 = 3,527.396195 lb/gal
1,000 hectograms per cup = 3,527.396195 pounds per gallon.
Conversion table
| Hectogram per Cup (hg/cup) | Pound per Gallon (lb/gal) |
|---|---|
| 0.1 hg/cup | 0.3527396195 lb/gal |
| 1 hg/cup | 3.527396195 lb/gal |
| 10 hg/cup | 35.27396195 lb/gal |
| 100 hg/cup | 352.7396195 lb/gal |
| 1,000 hg/cup | 3,527.396195 lb/gal |
| 10,000 hg/cup | 35,273.96195 lb/gal |
Reverse conversion: Pound per Gallon to Hectogram per Cup
3.527396195 lb/gal × 0.2834952312 = 1 hg/cup
3.527396195 pounds per gallon = 1 hectograms per cup.
hectograms per cup = pounds per gallon × 0.28349523125
For a page dedicated to this direction, see Pound per Gallon to Hectogram per Cup.
Understanding the Hectogram per Cup (hg/cup)
Mass per volume density.
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
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 pounds per gallon are in 1 hectogram per cup?
1 hectogram per cup equals 3.527396195 pounds per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert hectogram per cup to pound per gallon?
Multiply the hectogram per cup value by 3.527396195. The converter above does this instantly to whatever precision you set.
How do I convert pound per gallon back to hectogram per cup?
Use the reverse factor: 1 pound per gallon equals 0.2834952312 hectograms per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a hectogram per cup?
Hectogram per Cup (hg/cup) is a unit of density.
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.
Is the hectogram per cup to pound per gallon conversion exact?
Yes. Both hectogram per cup and pound per gallon are defined by fixed standards rather than physical artifacts, so the factor of 3.527396195 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.