Mass per volume density.
Milligrams per Gallon to Pounds per Cup Converter — mg/gal to lb/cup
Convert Milligram per Gallon (mg/gal) to Pound per Cup (lb/cup) using the exact conversion factor (1 milligram per gallon = 1.377889e-7 pound per cup). See the formula, worked examples, and conversion table.
Milligrams 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 0.0002641720524 / 1917.222837.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Milligrams per Gallon to Pounds per Cup
Milligram 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 = milligrams per gallon × 1.377889e-7
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram per gallon equals 0.000264172052358 base units, and 1 pound per cup equals 1917.22283707 base units, so dividing one by the other gives the direct milligram per gallon-to-pound per cup factor of 1.377889e-7.
Simple example
1 mg/gal × 1.377889e-7 = 1.377889e-7 lb/cup
1 milligram per gallon = 1.377889e-7 pounds per cup.
Real-world example
1,000 mg/gal × 1.377889e-7 = 0.0001377889 lb/cup
1,000 milligrams per gallon = 0.0001377889 pounds per cup.
Conversion table
| Milligram per Gallon (mg/gal) | Pound per Cup (lb/cup) |
|---|---|
| 0.1 mg/gal | 1.377889e-8 lb/cup |
| 1 mg/gal | 1.377889e-7 lb/cup |
| 10 mg/gal | 0.0000013779 lb/cup |
| 100 mg/gal | 0.0000137789 lb/cup |
| 1,000 mg/gal | 0.0001377889 lb/cup |
| 10,000 mg/gal | 0.0013778891 lb/cup |
Reverse conversion: Pound per Cup to Milligram per Gallon
1.377889e-7 lb/cup × 7257477.92 = 0.9999998994 mg/gal
1.377889e-7 pounds per cup = 0.9999998994 milligrams per gallon.
milligrams per gallon = pounds per cup × 7257477.92
For a page dedicated to this direction, see Pound per Cup to Milligram per Gallon.
Understanding the Milligram per Gallon (mg/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 milligram per gallon?
1 milligram per gallon equals 1.377889e-7 pounds per cup, using the exact defined conversion factor rather than an estimate.
How do I convert milligram per gallon to pound per cup?
Multiply the milligram per gallon value by 1.377889e-7. The converter above does this instantly to whatever precision you set.
How do I convert pound per cup back to milligram per gallon?
Use the reverse factor: 1 pound per cup equals 7,257,477.92 milligrams per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram per gallon?
Milligram per Gallon (mg/gal) is a unit of density.
What is a pound per cup?
Pound per Cup (lb/cup) is a unit of density.
Is the milligram per gallon to pound per cup conversion exact?
Yes. Both milligram per gallon and pound per cup are defined by fixed standards rather than physical artifacts, so the factor of 1.377889e-7 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.