Mass per volume density.
Grains per Gallon to Grains per Cup Converter — gr/gal to gr/cup
Convert Grain per Gallon (gr/gal) to Grain per Cup (gr/cup) using the exact conversion factor (1 grain per gallon = 0.0625 grain per cup). See the formula, worked examples, and conversion table.
Grains per Gallon to Grains 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 / 0.2738889767.
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 Grains per Cup
Grain per Gallon and Grain 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
grains per cup = grains per gallon × 0.0625
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 grain per cup equals 0.273888976724 base units, so dividing one by the other gives the direct grain per gallon-to-grain per cup factor of 0.0625.
Simple example
1 gr/gal × 0.0625 = 0.0625 gr/cup
1 grain per gallon = 0.0625 grains per cup.
Real-world example
1,000 gr/gal × 0.0625 = 62.5 gr/cup
1,000 grains per gallon = 62.5 grains per cup.
Conversion table
| Grain per Gallon (gr/gal) | Grain per Cup (gr/cup) |
|---|---|
| 0.1 gr/gal | 0.00625 gr/cup |
| 1 gr/gal | 0.0625 gr/cup |
| 10 gr/gal | 0.625 gr/cup |
| 100 gr/gal | 6.25 gr/cup |
| 1,000 gr/gal | 62.5 gr/cup |
| 10,000 gr/gal | 625 gr/cup |
Reverse conversion: Grain per Cup to Grain per Gallon
0.0625 gr/cup × 16 = 1 gr/gal
0.0625 grains per cup = 1 grain per gallon.
grains per gallon = grains per cup × 16
For a page dedicated to this direction, see Grain per Cup to Grain per Gallon.
Understanding the Grain per Gallon (gr/gal)
Mass per volume density.
Understanding the Grain per Cup (gr/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains per cup are in 1 grain per gallon?
1 grain per gallon equals 0.0625 grains per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per gallon to grain per cup?
Multiply the grain per gallon value by 0.0625. The converter above does this instantly to whatever precision you set.
How do I convert grain per cup back to grain per gallon?
Use the reverse factor: 1 grain per cup equals 16 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 grain per cup?
Grain per Cup (gr/cup) is a unit of density.
Is the grain per gallon to grain per cup conversion exact?
Yes. Both grain per gallon and grain per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.0625 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.