Mass per volume density.
Drams per Fluid ounce to Grains per Cup Converter — dr/fl oz to gr/cup
Convert Dram per Fluid ounce (dr/fl oz) to Grain per Cup (gr/cup) using the exact conversion factor (1 dram per fluid ounce = 218.75 grain per cup). See the formula, worked examples, and conversion table.
Drams per Fluid ounce 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 59.91321366 / 0.2738889767.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Drams per Fluid ounce to Grains per Cup
Dram per Fluid ounce 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 = drams per fluid ounce × 218.75
This factor comes from each unit's defined relationship to the category's base unit: 1 dram per fluid ounce equals 59.9132136584 base units, and 1 grain per cup equals 0.273888976724 base units, so dividing one by the other gives the direct dram per fluid ounce-to-grain per cup factor of 218.75.
Simple example
1 dr/fl oz × 218.75 = 218.75 gr/cup
1 dram per fluid ounce = 218.75 grains per cup.
Real-world example
1,000 dr/fl oz × 218.75 = 218,750 gr/cup
1,000 drams per fluid ounce = 218,750 grains per cup.
Conversion table
| Dram per Fluid ounce (dr/fl oz) | Grain per Cup (gr/cup) |
|---|---|
| 0.1 dr/fl oz | 21.875 gr/cup |
| 1 dr/fl oz | 218.75 gr/cup |
| 10 dr/fl oz | 2,187.5 gr/cup |
| 100 dr/fl oz | 21,875 gr/cup |
| 1,000 dr/fl oz | 218,750 gr/cup |
| 10,000 dr/fl oz | 2,187,500 gr/cup |
Reverse conversion: Grain per Cup to Dram per Fluid ounce
218.75 gr/cup × 0.004571428571 = 1 dr/fl oz
218.75 grains per cup = 1 drams per fluid ounce.
drams per fluid ounce = grains per cup × 0.00457142857143
For a page dedicated to this direction, see Grain per Cup to Dram per Fluid ounce.
Understanding the Dram per Fluid ounce (dr/fl oz)
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 dram per fluid ounce?
1 dram per fluid ounce equals 218.75 grains per cup, using the exact defined conversion factor rather than an estimate.
How do I convert dram per fluid ounce to grain per cup?
Multiply the dram per fluid ounce value by 218.75. The converter above does this instantly to whatever precision you set.
How do I convert grain per cup back to dram per fluid ounce?
Use the reverse factor: 1 grain per cup equals 0.0045714286 drams per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a dram per fluid ounce?
Dram per Fluid ounce (dr/fl oz) is a unit of density.
What is a grain per cup?
Grain per Cup (gr/cup) is a unit of density.
Is the dram per fluid ounce to grain per cup conversion exact?
Yes. Both dram per fluid ounce and grain per cup are defined by fixed standards rather than physical artifacts, so the factor of 218.75 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.