Mass per volume density.
Pounds per Cubic yard to Grains per Cup Converter — lb/yd3 to gr/cup
Convert Pound per Cubic yard (lb/yd3) to Grain per Cup (gr/cup) using the exact conversion factor (1 pound per cubic yard = 2.166120113 grain per cup). See the formula, worked examples, and conversion table.
Pounds per Cubic yard 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 0.5932764213 / 0.2738889767.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Cubic yard to Grains per Cup
Pound per Cubic yard 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 = pounds per cubic yard × 2.16612011317
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cubic yard equals 0.593276421258 base units, and 1 grain per cup equals 0.273888976724 base units, so dividing one by the other gives the direct pound per cubic yard-to-grain per cup factor of 2.16612011317.
Simple example
1 lb/yd3 × 2.166120113 = 2.166120113 gr/cup
1 pound per cubic yard = 2.166120113 grains per cup.
Real-world example
1,000 lb/yd3 × 2.166120113 = 2,166.120113 gr/cup
1,000 pounds per cubic yard = 2,166.120113 grains per cup.
Conversion table
| Pound per Cubic yard (lb/yd3) | Grain per Cup (gr/cup) |
|---|---|
| 0.1 lb/yd3 | 0.2166120113 gr/cup |
| 1 lb/yd3 | 2.166120113 gr/cup |
| 10 lb/yd3 | 21.66120113 gr/cup |
| 100 lb/yd3 | 216.6120113 gr/cup |
| 1,000 lb/yd3 | 2,166.120113 gr/cup |
| 10,000 lb/yd3 | 21,661.20113 gr/cup |
Reverse conversion: Grain per Cup to Pound per Cubic yard
2.166120113 gr/cup × 0.4616549165 = 0.9999999999 lb/yd3
2.166120113 grains per cup = 0.9999999999 pounds per cubic yard.
pounds per cubic yard = grains per cup × 0.461654916512
For a page dedicated to this direction, see Grain per Cup to Pound per Cubic yard.
Understanding the Pound per Cubic yard (lb/yd3)
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 pound per cubic yard?
1 pound per cubic yard equals 2.166120113 grains per cup, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cubic yard to grain per cup?
Multiply the pound per cubic yard value by 2.166120113. The converter above does this instantly to whatever precision you set.
How do I convert grain per cup back to pound per cubic yard?
Use the reverse factor: 1 grain per cup equals 0.4616549165 pounds per cubic yard. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per cubic yard?
Pound per Cubic yard (lb/yd3) is a unit of density.
What is a grain per cup?
Grain per Cup (gr/cup) is a unit of density.
Is the pound per cubic yard to grain per cup conversion exact?
Yes. Both pound per cubic yard and grain per cup are defined by fixed standards rather than physical artifacts, so the factor of 2.166120113 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.