Mass per volume density.
Stones per Gallon to Pounds per Cubic Millimeter Converter — st/gal to lb/mm3
Convert Stone per Gallon (st/gal) to Pound per Cubic Millimeter (lb/mm3) using the exact conversion factor (1 stone per gallon = 0.0000036984 pound per cubic millimeter). See the formula, worked examples, and conversion table.
Stones per Gallon to Pounds per Cubic Millimeter 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 / 4.5359237e+8.
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 Pounds per Cubic Millimeter
Stone per Gallon and Pound per Cubic Millimeter 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
pounds per cubic millimeter = stones per gallon × 0.00000369840873301
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 pound per cubic millimeter equals 453592370 base units, so dividing one by the other gives the direct stone per gallon-to-pound per cubic millimeter factor of 0.00000369840873301.
Simple example
1 st/gal × 0.000003698408733 = 0.0000036984 lb/mm3
1 stone per gallon = 0.0000036984 pounds per cubic millimeter.
Real-world example
1,000 st/gal × 0.000003698408733 = 0.0036984087 lb/mm3
1,000 stones per gallon = 0.0036984087 pounds per cubic millimeter.
Conversion table
| Stone per Gallon (st/gal) | Pound per Cubic Millimeter (lb/mm3) |
|---|---|
| 0.1 st/gal | 3.698409e-7 lb/mm3 |
| 1 st/gal | 0.0000036984 lb/mm3 |
| 10 st/gal | 0.0000369841 lb/mm3 |
| 100 st/gal | 0.0003698409 lb/mm3 |
| 1,000 st/gal | 0.0036984087 lb/mm3 |
| 10,000 st/gal | 0.0369840873 lb/mm3 |
Reverse conversion: Pound per Cubic Millimeter to Stone per Gallon
0.0000036984 lb/mm3 × 270386.556 = 0.9999976387 st/gal
0.0000036984 pounds per cubic millimeter = 0.9999976387 stones per gallon.
stones per gallon = pounds per cubic millimeter × 270386.556
For a page dedicated to this direction, see Pound per Cubic Millimeter to Stone per Gallon.
Understanding the Stone per Gallon (st/gal)
Mass per volume density.
Understanding the Pound per Cubic Millimeter (lb/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per cubic millimeter are in 1 stone per gallon?
1 stone per gallon equals 0.0000036984 pounds per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert stone per gallon to pound per cubic millimeter?
Multiply the stone per gallon value by 0.000003698408733. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic millimeter back to stone per gallon?
Use the reverse factor: 1 pound per cubic millimeter equals 270,386.556 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 pound per cubic millimeter?
Pound per Cubic Millimeter (lb/mm3) is a unit of density.
Is the stone per gallon to pound per cubic millimeter conversion exact?
Yes. Both stone per gallon and pound per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 0.000003698408733 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.