Mass per volume density.
Milligrams per Fluid ounce to Grains per Cup Converter — mg/fl oz to gr/cup
Convert Milligram per Fluid ounce (mg/fl oz) to Grain per Cup (gr/cup) using the exact conversion factor (1 milligram per fluid ounce = 0.1234588668 grain per cup). See the formula, worked examples, and conversion table.
Milligrams 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 0.0338140227 / 0.2738889767.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Milligrams per Fluid ounce to Grains per Cup
Milligram 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 = milligrams per fluid ounce × 0.123458866824
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram per fluid ounce equals 0.0338140227018 base units, and 1 grain per cup equals 0.273888976724 base units, so dividing one by the other gives the direct milligram per fluid ounce-to-grain per cup factor of 0.123458866824.
Simple example
1 mg/fl oz × 0.1234588668 = 0.1234588668 gr/cup
1 milligram per fluid ounce = 0.1234588668 grains per cup.
Real-world example
1,000 mg/fl oz × 0.1234588668 = 123.4588668 gr/cup
1,000 milligrams per fluid ounce = 123.4588668 grains per cup.
Conversion table
| Milligram per Fluid ounce (mg/fl oz) | Grain per Cup (gr/cup) |
|---|---|
| 0.1 mg/fl oz | 0.0123458867 gr/cup |
| 1 mg/fl oz | 0.1234588668 gr/cup |
| 10 mg/fl oz | 1.234588668 gr/cup |
| 100 mg/fl oz | 12.34588668 gr/cup |
| 1,000 mg/fl oz | 123.4588668 gr/cup |
| 10,000 mg/fl oz | 1,234.588668 gr/cup |
Reverse conversion: Grain per Cup to Milligram per Fluid ounce
0.1234588668 gr/cup × 8.09986375 = 0.9999999998 mg/fl oz
0.1234588668 grains per cup = 0.9999999998 milligrams per fluid ounce.
milligrams per fluid ounce = grains per cup × 8.09986375
For a page dedicated to this direction, see Grain per Cup to Milligram per Fluid ounce.
Understanding the Milligram per Fluid ounce (mg/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 milligram per fluid ounce?
1 milligram per fluid ounce equals 0.1234588668 grains per cup, using the exact defined conversion factor rather than an estimate.
How do I convert milligram per fluid ounce to grain per cup?
Multiply the milligram per fluid ounce value by 0.1234588668. The converter above does this instantly to whatever precision you set.
How do I convert grain per cup back to milligram per fluid ounce?
Use the reverse factor: 1 grain per cup equals 8.09986375 milligrams per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram per fluid ounce?
Milligram per Fluid ounce (mg/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 milligram per fluid ounce to grain per cup conversion exact?
Yes. Both milligram per fluid ounce and grain per cup are defined by fixed standards rather than physical artifacts, so the factor of 0.1234588668 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.