Mass per volume density.
Grains per Cubic Millimeter to Stones per Cubic yard Converter — gr/mm3 to st/yd3
Convert Grain per Cubic Millimeter (gr/mm3) to Stone per Cubic yard (st/yd3) using the exact conversion factor (1 grain per cubic millimeter = 7,801.580184 stone per cubic yard). See the formula, worked examples, and conversion table.
Grains per Cubic Millimeter to Stones per Cubic yard 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 64798.91 / 8.305869898.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grains per Cubic Millimeter to Stones per Cubic yard
Grain per Cubic Millimeter and Stone per Cubic yard 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
stones per cubic yard = grains per cubic millimeter × 7801.58018351
This factor comes from each unit's defined relationship to the category's base unit: 1 grain per cubic millimeter equals 64798.91 base units, and 1 stone per cubic yard equals 8.30586989761 base units, so dividing one by the other gives the direct grain per cubic millimeter-to-stone per cubic yard factor of 7801.58018351.
Simple example
1 gr/mm3 × 7801.580184 = 7,801.580184 st/yd3
1 grain per cubic millimeter = 7,801.580184 stones per cubic yard.
Real-world example
1,000 gr/mm3 × 7801.580184 = 7,801,580.184 st/yd3
1,000 grains per cubic millimeter = 7,801,580.184 stones per cubic yard.
Conversion table
| Grain per Cubic Millimeter (gr/mm3) | Stone per Cubic yard (st/yd3) |
|---|---|
| 0.1 gr/mm3 | 780.1580184 st/yd3 |
| 1 gr/mm3 | 7,801.580184 st/yd3 |
| 10 gr/mm3 | 78,015.80184 st/yd3 |
| 100 gr/mm3 | 780,158.0184 st/yd3 |
| 1,000 gr/mm3 | 7,801,580.184 st/yd3 |
| 10,000 gr/mm3 | 78,015,801.84 st/yd3 |
Reverse conversion: Stone per Cubic yard to Grain per Cubic Millimeter
1 st/yd3 × 0.0001281791607 = 0.0001281792 gr/mm3
1 stone per cubic yard = 0.0001281792 grains per cubic millimeter.
grains per cubic millimeter = stones per cubic yard × 0.000128179160693
For a page dedicated to this direction, see Stone per Cubic yard to Grain per Cubic Millimeter.
Understanding the Grain per Cubic Millimeter (gr/mm3)
Mass per volume density.
Understanding the Stone per Cubic yard (st/yd3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per cubic yard are in 1 grain per cubic millimeter?
1 grain per cubic millimeter equals 7,801.580184 stones per cubic yard, using the exact defined conversion factor rather than an estimate.
How do I convert grain per cubic millimeter to stone per cubic yard?
Multiply the grain per cubic millimeter value by 7801.580184. The converter above does this instantly to whatever precision you set.
How do I convert stone per cubic yard back to grain per cubic millimeter?
Use the reverse factor: 1 stone per cubic yard equals 0.0001281792 grains per cubic millimeter. You can also use the swap control in the converter above to flip the direction instantly.
What is a grain per cubic millimeter?
Grain per Cubic Millimeter (gr/mm3) is a unit of density.
What is a stone per cubic yard?
Stone per Cubic yard (st/yd3) is a unit of density.
Is the grain per cubic millimeter to stone per cubic yard conversion exact?
Yes. Both grain per cubic millimeter and stone per cubic yard are defined by fixed standards rather than physical artifacts, so the factor of 7801.580184 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.