Mass per volume density.
Hectograms per Imperial gallon to Grains per Cup Converter — hg/imp gal to gr/cup
Convert Hectogram per Imperial gallon (hg/imp gal) to Grain per Cup (gr/cup) using the exact conversion factor (1 hectogram per imperial gallon = 80.31329005 grain per cup). See the formula, worked examples, and conversion table.
Hectograms per Imperial gallon 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 21.99692483 / 0.2738889767.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Hectograms per Imperial gallon to Grains per Cup
Hectogram per Imperial gallon 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 = hectograms per imperial gallon × 80.3132900527
This factor comes from each unit's defined relationship to the category's base unit: 1 hectogram per imperial gallon equals 21.9969248299 base units, and 1 grain per cup equals 0.273888976724 base units, so dividing one by the other gives the direct hectogram per imperial gallon-to-grain per cup factor of 80.3132900527.
Simple example
1 hg/imp gal × 80.31329005 = 80.31329005 gr/cup
1 hectogram per imperial gallon = 80.31329005 grains per cup.
Real-world example
1,000 hg/imp gal × 80.31329005 = 80,313.29005 gr/cup
1,000 hectograms per imperial gallon = 80,313.29005 grains per cup.
Conversion table
| Hectogram per Imperial gallon (hg/imp gal) | Grain per Cup (gr/cup) |
|---|---|
| 0.1 hg/imp gal | 8.031329005 gr/cup |
| 1 hg/imp gal | 80.31329005 gr/cup |
| 10 hg/imp gal | 803.1329005 gr/cup |
| 100 hg/imp gal | 8,031.329005 gr/cup |
| 1,000 hg/imp gal | 80,313.29005 gr/cup |
| 10,000 hg/imp gal | 803,132.9005 gr/cup |
Reverse conversion: Grain per Cup to Hectogram per Imperial gallon
80.31329005 gr/cup × 0.01245123938 = 1 hg/imp gal
80.31329005 grains per cup = 1 hectograms per imperial gallon.
hectograms per imperial gallon = grains per cup × 0.012451239382
For a page dedicated to this direction, see Grain per Cup to Hectogram per Imperial gallon.
Understanding the Hectogram per Imperial gallon (hg/imp gal)
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 hectogram per imperial gallon?
1 hectogram per imperial gallon equals 80.31329005 grains per cup, using the exact defined conversion factor rather than an estimate.
How do I convert hectogram per imperial gallon to grain per cup?
Multiply the hectogram per imperial gallon value by 80.31329005. The converter above does this instantly to whatever precision you set.
How do I convert grain per cup back to hectogram per imperial gallon?
Use the reverse factor: 1 grain per cup equals 0.0124512394 hectograms per imperial gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a hectogram per imperial gallon?
Hectogram per Imperial gallon (hg/imp gal) is a unit of density.
What is a grain per cup?
Grain per Cup (gr/cup) is a unit of density.
Is the hectogram per imperial gallon to grain per cup conversion exact?
Yes. Both hectogram per imperial gallon and grain per cup are defined by fixed standards rather than physical artifacts, so the factor of 80.31329005 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.