Mass per volume density.
Grains per Cup to Milligrams per Pint Converter — gr/cup to mg/pt
Convert Grain per Cup (gr/cup) to Milligram per Pint (mg/pt) using the exact conversion factor (1 grain per cup = 129.59782 milligram per pint). See the formula, worked examples, and conversion table.
Grains per Cup to Milligrams per Pint 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 0.2738889767 / 0.002113376419.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Cup to Milligrams per Pint
Grain per Cup and Milligram per Pint 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
milligrams per pint = grains per cup × 129.59782
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cup equals 0.273888976724 base units, and 1 milligram per pint equals 0.00211337641887 base units, so dividing one by the other gives the direct grain per cup-to-milligram per pint factor of 129.59782.
Simple example
1 gr/cup × 129.59782 = 129.59782 mg/pt
1 grain per cup = 129.59782 milligrams per pint.
Real-world example
1,000 gr/cup × 129.59782 = 129,597.82 mg/pt
1,000 grains per cup = 129,597.82 milligrams per pint.
Conversion table
| Grain per Cup (gr/cup) | Milligram per Pint (mg/pt) |
|---|---|
| 0.1 gr/cup | 12.959782 mg/pt |
| 1 gr/cup | 129.59782 mg/pt |
| 10 gr/cup | 1,295.9782 mg/pt |
| 100 gr/cup | 12,959.782 mg/pt |
| 1,000 gr/cup | 129,597.82 mg/pt |
| 10,000 gr/cup | 1,295,978.2 mg/pt |
Reverse conversion: Milligram per Pint to Grain per Cup
129.59782 mg/pt × 0.007716179176 = 1 gr/cup
129.59782 milligrams per pint = 1 grains per cup.
grains per cup = milligrams per pint × 0.00771617917647
For a page dedicated to this direction, see Milligram per Pint to Grain per Cup.
Understanding the Grain per Cup (gr/cup)
Mass per volume density.
Understanding the Milligram per Pint (mg/pt)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per pint are in 1 grain per cup?
1 grain per cup equals 129.59782 milligrams per pint, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cup to milligram per pint?
Multiply the grain per cup value by 129.59782. The converter above does this instantly to whatever precision you set.
How do I convert milligram per pint back to grain per cup?
Use the reverse factor: 1 milligram per pint equals 0.0077161792 grains per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cup?
Grain per Cup (gr/cup) is a unit of density.
What is a milligram per pint?
Milligram per Pint (mg/pt) is a unit of density.
Is the grain per cup to milligram per pint conversion exact?
Yes. Both grain per cup and milligram per pint are defined by fixed standards rather than physical artifacts, so the factor of 129.59782 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.