Mass per volume density.
Grains per Fluid ounce to Ounces per Cup Converter — gr/fl oz to oz/cup
Convert Grain per Fluid ounce (gr/fl oz) to Ounce per Cup (oz/cup) using the exact conversion factor (1 grain per fluid ounce = 0.0182857143 ounce per cup). See the formula, worked examples, and conversion table.
Grains per Fluid ounce to Ounces 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 / 119.8264273.
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 Ounces per Cup
Grain per Fluid ounce and Ounce 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
ounces per cup = grains per fluid ounce × 0.0182857142857
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 ounce per cup equals 119.826427317 base units, so dividing one by the other gives the direct grain per fluid ounce-to-ounce per cup factor of 0.0182857142857.
Simple example
1 gr/fl oz × 0.01828571429 = 0.0182857143 oz/cup
1 grain per fluid ounce = 0.0182857143 ounces per cup.
Real-world example
1,000 gr/fl oz × 0.01828571429 = 18.28571429 oz/cup
1,000 grains per fluid ounce = 18.28571429 ounces per cup.
Conversion table
| Grain per Fluid ounce (gr/fl oz) | Ounce per Cup (oz/cup) |
|---|---|
| 0.1 gr/fl oz | 0.0018285714 oz/cup |
| 1 gr/fl oz | 0.0182857143 oz/cup |
| 10 gr/fl oz | 0.1828571429 oz/cup |
| 100 gr/fl oz | 1.828571429 oz/cup |
| 1,000 gr/fl oz | 18.28571429 oz/cup |
| 10,000 gr/fl oz | 182.8571429 oz/cup |
Reverse conversion: Ounce per Cup to Grain per Fluid ounce
0.0182857143 oz/cup × 54.6875 = 1.000000001 gr/fl oz
0.0182857143 ounces per cup = 1.000000001 grains per fluid ounce.
grains per fluid ounce = ounces per cup × 54.6875
For a page dedicated to this direction, see Ounce per Cup to Grain per Fluid ounce.
Understanding the Grain per Fluid ounce (gr/fl oz)
Mass per volume density.
Understanding the Ounce per Cup (oz/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ounces per cup are in 1 grain per fluid ounce?
1 grain per fluid ounce equals 0.0182857143 ounces per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per fluid ounce to ounce per cup?
Multiply the grain per fluid ounce value by 0.01828571429. The converter above does this instantly to whatever precision you set.
How do I convert ounce per cup back to grain per fluid ounce?
Use the reverse factor: 1 ounce per cup equals 54.6875 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 ounce per cup?
Ounce per Cup (oz/cup) is a unit of density.
Is the grain per fluid ounce to ounce per cup conversion exact?
Yes. Both grain per fluid ounce and ounce per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.01828571429 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.