Mass per volume density.
Grams per Gallon to Milligrams per Cup Converter — g/gal to mg/cup
Convert Gram per Gallon (g/gal) to Milligram per Cup (mg/cup) using the exact conversion factor (1 gram per gallon = 62.5 milligram per cup). See the formula, worked examples, and conversion table.
Grams per Gallon to Milligrams 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 0.2641720524 / 0.004226752838.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grams per Gallon to Milligrams per Cup
Gram per Gallon and Milligram 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
milligrams per cup = grams per gallon × 62.5
This factor comes from each unit's defined relationship to the category's base unit: 1 gram per gallon equals 0.264172052358 base units, and 1 milligram per cup equals 0.00422675283773 base units, so dividing one by the other gives the direct gram per gallon-to-milligram per cup factor of 62.5.
Simple example
1 g/gal × 62.5 = 62.5 mg/cup
1 gram per gallon = 62.5 milligrams per cup.
Real-world example
1,000 g/gal × 62.5 = 62,500 mg/cup
1,000 grams per gallon = 62,500 milligrams per cup.
Conversion table
| Gram per Gallon (g/gal) | Milligram per Cup (mg/cup) |
|---|---|
| 0.1 g/gal | 6.25 mg/cup |
| 1 g/gal | 62.5 mg/cup |
| 10 g/gal | 625 mg/cup |
| 100 g/gal | 6,250 mg/cup |
| 1,000 g/gal | 62,500 mg/cup |
| 10,000 g/gal | 625,000 mg/cup |
Reverse conversion: Milligram per Cup to Gram per Gallon
62.5 mg/cup × 0.016 = 1 g/gal
62.5 milligrams per cup = 1 gram per gallon.
grams per gallon = milligrams per cup × 0.016
For a page dedicated to this direction, see Milligram per Cup to Gram per Gallon.
Understanding the Gram per Gallon (g/gal)
Mass per volume density.
Understanding the Milligram per Cup (mg/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per cup are in 1 gram per gallon?
1 gram per gallon equals 62.5 milligrams per cup, using the exact defined conversion factor rather than an estimate.
How do I convert gram per gallon to milligram per cup?
Multiply the gram per gallon value by 62.5. The converter above does this instantly to whatever precision you set.
How do I convert milligram per cup back to gram per gallon?
Use the reverse factor: 1 milligram per cup equals 0.016 grams per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram per gallon?
Gram per Gallon (g/gal) is a unit of density.
What is a milligram per cup?
Milligram per Cup (mg/cup) is a unit of density.
Is the gram per gallon to milligram per cup conversion exact?
Yes. Both gram per gallon and milligram per cup are defined by fixed standards rather than physical artifacts, so the factor of 62.5 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.