Mass per volume density.
Stones per Gallon to Megagrams per Cubic yard Converter — st/gal to Mg/yd3
Convert Stone per Gallon (st/gal) to Megagram per Cubic yard (Mg/yd3) using the exact conversion factor (1 stone per gallon = 1.28259428 megagram per cubic yard). See the formula, worked examples, and conversion table.
Stones per Gallon to Megagrams 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 1677.569982 / 1307.950619.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Gallon to Megagrams per Cubic yard
Stone per Gallon and Megagram 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
megagrams per cubic yard = stones per gallon × 1.28259427968
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per gallon equals 1677.56998244 base units, and 1 megagram per cubic yard equals 1307.95061931 base units, so dividing one by the other gives the direct stone per gallon-to-megagram per cubic yard factor of 1.28259427968.
Simple example
1 st/gal × 1.28259428 = 1.28259428 Mg/yd3
1 stone per gallon = 1.28259428 megagrams per cubic yard.
Real-world example
1,000 st/gal × 1.28259428 = 1,282.59428 Mg/yd3
1,000 stones per gallon = 1,282.59428 megagrams per cubic yard.
Conversion table
| Stone per Gallon (st/gal) | Megagram per Cubic yard (Mg/yd3) |
|---|---|
| 0.1 st/gal | 0.128259428 Mg/yd3 |
| 1 st/gal | 1.28259428 Mg/yd3 |
| 10 st/gal | 12.8259428 Mg/yd3 |
| 100 st/gal | 128.259428 Mg/yd3 |
| 1,000 st/gal | 1,282.59428 Mg/yd3 |
| 10,000 st/gal | 12,825.9428 Mg/yd3 |
Reverse conversion: Megagram per Cubic yard to Stone per Gallon
1.28259428 Mg/yd3 × 0.7796697801 = 1 st/gal
1.28259428 megagrams per cubic yard = 1 stones per gallon.
stones per gallon = megagrams per cubic yard × 0.779669780103
For a page dedicated to this direction, see Megagram per Cubic yard to Stone per Gallon.
Understanding the Stone per Gallon (st/gal)
Mass per volume density.
Understanding the Megagram per Cubic yard (Mg/yd3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many megagrams per cubic yard are in 1 stone per gallon?
1 stone per gallon equals 1.28259428 megagrams per cubic yard, using the exact defined conversion factor rather than an estimate.
How do I convert stone per gallon to megagram per cubic yard?
Multiply the stone per gallon value by 1.28259428. The converter above does this instantly to whatever precision you set.
How do I convert megagram per cubic yard back to stone per gallon?
Use the reverse factor: 1 megagram per cubic yard equals 0.7796697801 stones per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per gallon?
Stone per Gallon (st/gal) is a unit of density.
What is a megagram per cubic yard?
Megagram per Cubic yard (Mg/yd3) is a unit of density.
Is the stone per gallon to megagram per cubic yard conversion exact?
Yes. Both stone per gallon and megagram per cubic yard are defined by fixed standards rather than physical artifacts, so the factor of 1.28259428 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.