Mass per volume density.
Pounds per Gallon to Long tons per Cup Converter — lb/gal to long ton/cup
Convert Pound per Gallon (lb/gal) to Long ton per Cup (long ton/cup) using the exact conversion factor (1 pound per gallon = 0.0000279018 long ton per cup). See the formula, worked examples, conversion table, and common uses.
Pounds per Gallon to Long tons per Cup 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 / 4.29457916e+6.
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 Long tons per Cup
Pound per Gallon and Long ton per Cup 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
long tons per cup = pounds per gallon × 0.0000279017857143
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 long ton per cup equals 4294579.15504 base units, so dividing one by the other gives the direct pound per gallon-to-long ton per cup factor of 0.0000279017857143.
Simple example
1 lb/gal × 0.00002790178571 = 0.0000279018 long ton/cup
1 pound per gallon = 0.0000279018 long tons per cup.
Real-world example
1,000 lb/gal × 0.00002790178571 = 0.0279017857 long ton/cup
1,000 pounds per gallon = 0.0279017857 long tons per cup.
Conversion table
| Pound per Gallon (lb/gal) | Long ton per Cup (long ton/cup) |
|---|---|
| 0.1 lb/gal | 0.0000027902 long ton/cup |
| 1 lb/gal | 0.0000279018 long ton/cup |
| 10 lb/gal | 0.0002790179 long ton/cup |
| 100 lb/gal | 0.0027901786 long ton/cup |
| 1,000 lb/gal | 0.0279017857 long ton/cup |
| 10,000 lb/gal | 0.2790178571 long ton/cup |
Reverse conversion: Long ton per Cup to Pound per Gallon
0.0000279018 long ton/cup × 35840 = 1.000000512 lb/gal
0.0000279018 long tons per cup = 1.000000512 pounds per gallon.
pounds per gallon = long tons per cup × 35840
For a page dedicated to this direction, see Long ton per Cup 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 Long ton per Cup (long ton/cup)
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 long tons per cup are in 1 pound per gallon?
1 pound per gallon equals 0.0000279018 long tons per cup, using the exact defined conversion factor rather than an estimate.
How do I convert pound per gallon to long ton per cup?
Multiply the pound per gallon value by 0.00002790178571. The converter above does this instantly to whatever precision you set.
How do I convert long ton per cup back to pound per gallon?
Use the reverse factor: 1 long ton per cup equals 35,840 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 long ton per cup?
Long ton per Cup (long ton/cup) is a unit of density.
Is the pound per gallon to long ton per cup conversion exact?
Yes. Both pound per gallon and long ton per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.00002790178571 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)