Mass per volume density.
Stones per Cup to Kilograms per Cubic yard Converter — st/cup to kg/yd3
Convert Stone per Cup (st/cup) to Kilogram per Cubic yard (kg/yd3) using the exact conversion factor (1 stone per cup = 20,521.50847 kilogram per cubic yard). See the formula, worked examples, conversion table, and common uses.
Stones per Cup to Kilograms 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 26841.11972 / 1.307950619.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Cup to Kilograms per Cubic yard
Stone per Cup and Kilogram 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
kilograms per cubic yard = stones per cup × 20521.5084749
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per cup equals 26841.119719 base units, and 1 kilogram per cubic yard equals 1.30795061931 base units, so dividing one by the other gives the direct stone per cup-to-kilogram per cubic yard factor of 20521.5084749.
Simple example
1 st/cup × 20521.50847 = 20,521.50847 kg/yd3
1 stone per cup = 20,521.50847 kilograms per cubic yard.
Real-world example
1,000 st/cup × 20521.50847 = 20,521,508.47 kg/yd3
1,000 stones per cup = 20,521,508.47 kilograms per cubic yard.
Conversion table
| Stone per Cup (st/cup) | Kilogram per Cubic yard (kg/yd3) |
|---|---|
| 0.1 st/cup | 2,052.150847 kg/yd3 |
| 1 st/cup | 20,521.50847 kg/yd3 |
| 10 st/cup | 205,215.0847 kg/yd3 |
| 100 st/cup | 2,052,150.847 kg/yd3 |
| 1,000 st/cup | 20,521,508.47 kg/yd3 |
| 10,000 st/cup | 205,215,084.7 kg/yd3 |
Reverse conversion: Kilogram per Cubic yard to Stone per Cup
1 kg/yd3 × 0.00004872936126 = 0.0000487294 st/cup
1 kilogram per cubic yard = 0.0000487294 stones per cup.
stones per cup = kilograms per cubic yard × 0.0000487293612565
For a page dedicated to this direction, see Kilogram per Cubic yard to Stone per Cup.
Understanding the Stone per Cup (st/cup)
Mass per volume density.
Understanding the Kilogram per Cubic yard
Kilogram per Cubic yard (kg/yd3) measures density. A mathematically valid way to express bulk material density in kilograms per cubic yard. It is classified as a mixed metric/US customary density unit.
Uses of the Kilogram per Cubic yard today
- Can be used to express the density of bulk construction materials such as gravel, soil, or aggregate — in practice, US construction and landscaping references more commonly express this as tons per cubic yard or pounds per cubic foot
Kilogram per Cubic yard — sources
- US construction and landscaping material-estimating references — Bulk material weight by volume is typically reported in tons per cubic yard in US construction and landscaping contexts.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilograms per cubic yard are in 1 stone per cup?
1 stone per cup equals 20,521.50847 kilograms per cubic yard, using the exact defined conversion factor rather than an estimate.
How do I convert stone per cup to kilogram per cubic yard?
Multiply the stone per cup value by 20521.50847. The converter above does this instantly to whatever precision you set.
How do I convert kilogram per cubic yard back to stone per cup?
Use the reverse factor: 1 kilogram per cubic yard equals 0.0000487294 stones per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per cup?
Stone per Cup (st/cup) is a unit of density.
What is a kilogram per cubic yard?
Kilogram per Cubic yard (kg/yd3) measures density. A mathematically valid way to express bulk material density in kilograms per cubic yard. It is classified as a mixed metric/US customary density unit.
Is the stone per cup to kilogram per cubic yard conversion exact?
Yes. Both stone per cup and kilogram per cubic yard are defined by fixed standards rather than physical artifacts, so the factor of 20521.50847 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.