Mass per volume density.
Grains per Gallon to Pounds per Cup Converter — gr/gal to lb/cup
Convert Grain per Gallon (gr/gal) to Pound per Cup (lb/cup) using the exact conversion factor (1 grain per gallon = 0.0000089286 pound per cup). See the formula, worked examples, and conversion table.
Grains 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 0.01711806105 / 1917.222837.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Gallon to Pounds per Cup
Grain 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 = grains per gallon × 0.00000892857142857
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per gallon equals 0.0171180610453 base units, and 1 pound per cup equals 1917.22283707 base units, so dividing one by the other gives the direct grain per gallon-to-pound per cup factor of 0.00000892857142857.
Simple example
1 gr/gal × 0.000008928571429 = 0.0000089286 lb/cup
1 grain per gallon = 0.0000089286 pounds per cup.
Real-world example
1,000 gr/gal × 0.000008928571429 = 0.0089285714 lb/cup
1,000 grains per gallon = 0.0089285714 pounds per cup.
Conversion table
| Grain per Gallon (gr/gal) | Pound per Cup (lb/cup) |
|---|---|
| 0.1 gr/gal | 8.928571e-7 lb/cup |
| 1 gr/gal | 0.0000089286 lb/cup |
| 10 gr/gal | 0.0000892857 lb/cup |
| 100 gr/gal | 0.0008928571 lb/cup |
| 1,000 gr/gal | 0.0089285714 lb/cup |
| 10,000 gr/gal | 0.0892857143 lb/cup |
Reverse conversion: Pound per Cup to Grain per Gallon
0.0000089286 lb/cup × 112000 = 1.0000032 gr/gal
0.0000089286 pounds per cup = 1.0000032 grains per gallon.
grains per gallon = pounds per cup × 112000
For a page dedicated to this direction, see Pound per Cup to Grain per Gallon.
Understanding the Grain per Gallon (gr/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 grain per gallon?
1 grain per gallon equals 0.0000089286 pounds per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per gallon to pound per cup?
Multiply the grain per gallon value by 0.000008928571429. The converter above does this instantly to whatever precision you set.
How do I convert pound per cup back to grain per gallon?
Use the reverse factor: 1 pound per cup equals 112,000 grains per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per gallon?
Grain per Gallon (gr/gal) is a unit of density.
What is a pound per cup?
Pound per Cup (lb/cup) is a unit of density.
Is the grain per gallon to pound per cup conversion exact?
Yes. Both grain per gallon and pound per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.000008928571429 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.