Mass per volume density.
Grains per Fluid ounce to Grams per Cup Converter — gr/fl oz to g/cup
Convert Grain per Fluid ounce (gr/fl oz) to Gram per Cup (g/cup) using the exact conversion factor (1 grain per fluid ounce = 0.51839128 gram per cup). See the formula, worked examples, and conversion table.
Grains per Fluid ounce 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 2.191111814 / 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 Fluid ounce to Grams per Cup
Grain per Fluid ounce 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 fluid ounce × 0.51839128
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per fluid ounce equals 2.19111181379 base units, and 1 gram per cup equals 4.22675283773 base units, so dividing one by the other gives the direct grain per fluid ounce-to-gram per cup factor of 0.51839128.
Simple example
1 gr/fl oz × 0.51839128 = 0.51839128 g/cup
1 grain per fluid ounce = 0.51839128 grams per cup.
Real-world example
1,000 gr/fl oz × 0.51839128 = 518.39128 g/cup
1,000 grains per fluid ounce = 518.39128 grams per cup.
Conversion table
| Grain per Fluid ounce (gr/fl oz) | Gram per Cup (g/cup) |
|---|---|
| 0.1 gr/fl oz | 0.051839128 g/cup |
| 1 gr/fl oz | 0.51839128 g/cup |
| 10 gr/fl oz | 5.1839128 g/cup |
| 100 gr/fl oz | 51.839128 g/cup |
| 1,000 gr/fl oz | 518.39128 g/cup |
| 10,000 gr/fl oz | 5,183.9128 g/cup |
Reverse conversion: Gram per Cup to Grain per Fluid ounce
0.51839128 g/cup × 1.929044794 = 1 gr/fl oz
0.51839128 grams per cup = 1 grains per fluid ounce.
grains per fluid ounce = grams per cup × 1.92904479412
For a page dedicated to this direction, see Gram per Cup to Grain per Fluid ounce.
Understanding the Grain per Fluid ounce (gr/fl oz)
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 fluid ounce?
1 grain per fluid ounce equals 0.51839128 grams per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per fluid ounce to gram per cup?
Multiply the grain per fluid ounce value by 0.51839128. The converter above does this instantly to whatever precision you set.
How do I convert gram per cup back to grain per fluid ounce?
Use the reverse factor: 1 gram per cup equals 1.929044794 grains per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per fluid ounce?
Grain per Fluid ounce (gr/fl oz) 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 fluid ounce to gram per cup conversion exact?
Yes. Both grain per fluid ounce and gram per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.51839128 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.