Mass per volume density.
Long tons per Gallon to Pounds per Cup Converter — long ton/gal to lb/cup
Convert Long ton per Gallon (long ton/gal) to Pound per Cup (lb/cup) using the exact conversion factor (1 long ton per gallon = 140 pound per cup). See the formula, worked examples, and conversion table.
Long tons per Gallon to Pounds 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 268411.1972 / 1917.222837.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Long tons per Gallon to Pounds per Cup
Long ton per Gallon and Pound 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. Both are mass per volume density units.
Formula
pounds per cup = long tons per gallon × 140
This factor comes from each unit's defined relationship to the category's base unit: 1 long ton per gallon equals 268411.19719 base units, and 1 pound per cup equals 1917.22283707 base units, so dividing one by the other gives the direct long ton per gallon-to-pound per cup factor of 140.
Simple example
1 long ton/gal × 140 = 140 lb/cup
1 long ton per gallon = 140 pounds per cup.
Real-world example
1,000 long ton/gal × 140 = 140,000 lb/cup
1,000 long tons per gallon = 140,000 pounds per cup.
Conversion table
| Long ton per Gallon (long ton/gal) | Pound per Cup (lb/cup) |
|---|---|
| 0.1 long ton/gal | 14 lb/cup |
| 1 long ton/gal | 140 lb/cup |
| 10 long ton/gal | 1,400 lb/cup |
| 100 long ton/gal | 14,000 lb/cup |
| 1,000 long ton/gal | 140,000 lb/cup |
| 10,000 long ton/gal | 1,400,000 lb/cup |
Reverse conversion: Pound per Cup to Long ton per Gallon
140 lb/cup × 0.007142857143 = 1 long ton/gal
140 pounds per cup = 1 long tons per gallon.
long tons per gallon = pounds per cup × 0.00714285714286
For a page dedicated to this direction, see Pound per Cup to Long ton per Gallon.
Understanding the Long ton per Gallon (long ton/gal)
Mass per volume density.
Understanding the Pound per Cup (lb/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per cup are in 1 long ton per gallon?
1 long ton per gallon equals 140 pounds per cup, using the exact defined conversion factor rather than an estimate.
How do I convert long ton per gallon to pound per cup?
Multiply the long ton per gallon value by 140. The converter above does this instantly to whatever precision you set.
How do I convert pound per cup back to long ton per gallon?
Use the reverse factor: 1 pound per cup equals 0.0071428571 long tons per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a long ton per gallon?
Long ton per Gallon (long ton/gal) is a unit of density.
What is a pound per cup?
Pound per Cup (lb/cup) is a unit of density.
Is the long ton per gallon to pound per cup conversion exact?
Yes. Both long ton per gallon and pound per cup are defined by fixed standards rather than physical artifacts, so the factor of 140 used above is exact to as many digits as you choose to display.
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.