Mass per volume density.
Grains per Pint to Long tons per Cup Converter — gr/pt to long ton/cup
Convert Grain per Pint (gr/pt) to Long ton per Cup (long ton/cup) using the exact conversion factor (1 grain per pint = 3.188776e-8 long ton per cup). See the formula, worked examples, and conversion table.
Grains per Pint to Long tons 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 0.1369444884 / 4.29457916e+6.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Pint to Long tons per Cup
Grain per Pint and Long ton 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
long tons per cup = grains per pint × 3.188776e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per pint equals 0.136944488362 base units, and 1 long ton per cup equals 4294579.15504 base units, so dividing one by the other gives the direct grain per pint-to-long ton per cup factor of 3.188776e-8.
Simple example
1 gr/pt × 3.188776e-8 = 3.188776e-8 long ton/cup
1 grain per pint = 3.188776e-8 long tons per cup.
Real-world example
1,000 gr/pt × 3.188776e-8 = 0.0000318878 long ton/cup
1,000 grains per pint = 0.0000318878 long tons per cup.
Conversion table
| Grain per Pint (gr/pt) | Long ton per Cup (long ton/cup) |
|---|---|
| 0.1 gr/pt | 3.188776e-9 long ton/cup |
| 1 gr/pt | 3.188776e-8 long ton/cup |
| 10 gr/pt | 3.188776e-7 long ton/cup |
| 100 gr/pt | 0.0000031888 long ton/cup |
| 1,000 gr/pt | 0.0000318878 long ton/cup |
| 10,000 gr/pt | 0.0003188776 long ton/cup |
Reverse conversion: Long ton per Cup to Grain per Pint
3.188776e-8 long ton/cup × 31360000 = 1.000000154 gr/pt
3.188776e-8 long tons per cup = 1.000000154 grains per pint.
grains per pint = long tons per cup × 31360000
For a page dedicated to this direction, see Long ton per Cup to Grain per Pint.
Understanding the Grain per Pint (gr/pt)
Mass per volume density.
Understanding the Long ton per Cup (long ton/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many long tons per cup are in 1 grain per pint?
1 grain per pint equals 3.188776e-8 long tons per cup, using the exact defined conversion factor rather than an estimate.
How do I convert grain per pint to long ton per cup?
Multiply the grain per pint value by 3.188776e-8. The converter above does this instantly to whatever precision you set.
How do I convert long ton per cup back to grain per pint?
Use the reverse factor: 1 long ton per cup equals 31,360,000 grains per pint. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per pint?
Grain per Pint (gr/pt) is a unit of density.
What is a long ton per cup?
Long ton per Cup (long ton/cup) is a unit of density.
Is the grain per pint to long ton per cup conversion exact?
Yes. Both grain per pint and long ton per cup are defined by fixed standards rather than physical artifacts, so the factor of 3.188776e-8 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.