Mass per volume density.
Grains per Gallon to Grams per Cup Converter — gr/gal to g/cup
Convert Grain per Gallon (gr/gal) to Gram per Cup (g/cup) using the exact conversion factor (1 grain per gallon = 0.0040499319 gram per cup). See the formula, worked examples, and conversion table.
Grains per Gallon to Grams 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 / 4.226752838.
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 Grams per Cup
Grain per Gallon and Gram 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
grams per cup = grains per gallon × 0.004049931875
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 gram per cup equals 4.22675283773 base units, so dividing one by the other gives the direct grain per gallon-to-gram per cup factor of 0.004049931875.
Simple example
1 gr/gal × 0.004049931875 = 0.0040499319 g/cup
1 grain per gallon = 0.0040499319 grams per cup.
Real-world example
1,000 gr/gal × 0.004049931875 = 4.049931875 g/cup
1,000 grains per gallon = 4.049931875 grams per cup.
Conversion table
| Grain per Gallon (gr/gal) | Gram per Cup (g/cup) |
|---|---|
| 0.1 gr/gal | 0.0004049932 g/cup |
| 1 gr/gal | 0.0040499319 g/cup |
| 10 gr/gal | 0.0404993188 g/cup |
| 100 gr/gal | 0.4049931875 g/cup |
| 1,000 gr/gal | 4.049931875 g/cup |
| 10,000 gr/gal | 40.49931875 g/cup |
Reverse conversion: Gram per Cup to Grain per Gallon
0.0040499319 g/cup × 246.9177336 = 1.000000006 gr/gal
0.0040499319 grams per cup = 1.000000006 grains per gallon.
grains per gallon = grams per cup × 246.917733647
For a page dedicated to this direction, see Gram per Cup to Grain per Gallon.
Understanding the Grain per Gallon (gr/gal)
Mass per volume density.
Understanding the Gram per Cup (g/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grams per cup are in 1 grain per gallon?
1 grain per gallon equals 0.0040499319 grams per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per gallon to gram per cup?
Multiply the grain per gallon value by 0.004049931875. The converter above does this instantly to whatever precision you set.
How do I convert gram per cup back to grain per gallon?
Use the reverse factor: 1 gram per cup equals 246.9177336 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 gram per cup?
Gram per Cup (g/cup) is a unit of density.
Is the grain per gallon to gram per cup conversion exact?
Yes. Both grain per gallon and gram per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.004049931875 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.