Mass per volume density.
Grains per Cup to Grams per Gallon Converter — gr/cup to g/gal
Convert Grain per Cup (gr/cup) to Gram per Gallon (g/gal) using the exact conversion factor (1 grain per cup = 1.03678256 gram per gallon). See the formula, worked examples, and conversion table.
Grains per Cup to Grams per Gallon 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 0.2738889767 / 0.2641720524.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Cup to Grams per Gallon
Grain per Cup and Gram per Gallon 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 gallon = grains per cup × 1.03678256
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cup equals 0.273888976724 base units, and 1 gram per gallon equals 0.264172052358 base units, so dividing one by the other gives the direct grain per cup-to-gram per gallon factor of 1.03678256.
Simple example
1 gr/cup × 1.03678256 = 1.03678256 g/gal
1 grain per cup = 1.03678256 grams per gallon.
Real-world example
1,000 gr/cup × 1.03678256 = 1,036.78256 g/gal
1,000 grains per cup = 1,036.78256 grams per gallon.
Conversion table
| Grain per Cup (gr/cup) | Gram per Gallon (g/gal) |
|---|---|
| 0.1 gr/cup | 0.103678256 g/gal |
| 1 gr/cup | 1.03678256 g/gal |
| 10 gr/cup | 10.3678256 g/gal |
| 100 gr/cup | 103.678256 g/gal |
| 1,000 gr/cup | 1,036.78256 g/gal |
| 10,000 gr/cup | 10,367.8256 g/gal |
Reverse conversion: Gram per Gallon to Grain per Cup
1.03678256 g/gal × 0.9645223971 = 1 gr/cup
1.03678256 grams per gallon = 1 grains per cup.
grains per cup = grams per gallon × 0.964522397059
For a page dedicated to this direction, see Gram per Gallon to Grain per Cup.
Understanding the Grain per Cup (gr/cup)
Mass per volume density.
Understanding the Gram per Gallon (g/gal)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grams per gallon are in 1 grain per cup?
1 grain per cup equals 1.03678256 grams per gallon, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cup to gram per gallon?
Multiply the grain per cup value by 1.03678256. The converter above does this instantly to whatever precision you set.
How do I convert gram per gallon back to grain per cup?
Use the reverse factor: 1 gram per gallon equals 0.9645223971 grains per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cup?
Grain per Cup (gr/cup) is a unit of density.
What is a gram per gallon?
Gram per Gallon (g/gal) is a unit of density.
Is the grain per cup to gram per gallon conversion exact?
Yes. Both grain per cup and gram per gallon are defined by fixed standards rather than physical artifacts, so the factor of 1.03678256 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.