Mass per volume density.
Pounds per Imperial gallon to Stones per Cubic Millimeter Converter — lb/imp gal to st/mm3
Convert Pound per Imperial gallon (lb/imp gal) to Stone per Cubic Millimeter (st/mm3) using the exact conversion factor (1 pound per imperial gallon = 1.571209e-8 stone per cubic millimeter). See the formula, worked examples, and conversion table.
Pounds per Imperial gallon to Stones 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 99.77637266 / 6.35029318e+9.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Imperial gallon to Stones per Cubic Millimeter
Pound per Imperial gallon and Stone 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
stones per cubic millimeter = pounds per imperial gallon × 1.571209e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per imperial gallon equals 99.7763726631 base units, and 1 stone per cubic millimeter equals 6350293180 base units, so dividing one by the other gives the direct pound per imperial gallon-to-stone per cubic millimeter factor of 1.571209e-8.
Simple example
1 lb/imp gal × 1.571209e-8 = 1.571209e-8 st/mm3
1 pound per imperial gallon = 1.571209e-8 stones per cubic millimeter.
Real-world example
1,000 lb/imp gal × 1.571209e-8 = 0.0000157121 st/mm3
1,000 pounds per imperial gallon = 0.0000157121 stones per cubic millimeter.
Conversion table
| Pound per Imperial gallon (lb/imp gal) | Stone per Cubic Millimeter (st/mm3) |
|---|---|
| 0.1 lb/imp gal | 1.571209e-9 st/mm3 |
| 1 lb/imp gal | 1.571209e-8 st/mm3 |
| 10 lb/imp gal | 1.571209e-7 st/mm3 |
| 100 lb/imp gal | 0.0000015712 st/mm3 |
| 1,000 lb/imp gal | 0.0000157121 st/mm3 |
| 10,000 lb/imp gal | 0.0001571209 st/mm3 |
Reverse conversion: Stone per Cubic Millimeter to Pound per Imperial gallon
1.571209e-8 st/mm3 × 63645260 = 1.000000053 lb/imp gal
1.571209e-8 stones per cubic millimeter = 1.000000053 pounds per imperial gallon.
pounds per imperial gallon = stones per cubic millimeter × 63645260
For a page dedicated to this direction, see Stone per Cubic Millimeter to Pound per Imperial gallon.
Understanding the Pound per Imperial gallon (lb/imp gal)
Mass per volume density.
Understanding the Stone per Cubic Millimeter (st/mm3)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per cubic millimeter are in 1 pound per imperial gallon?
1 pound per imperial gallon equals 1.571209e-8 stones per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert pound per imperial gallon to stone per cubic millimeter?
Multiply the pound per imperial gallon value by 1.571209e-8. The converter above does this instantly to whatever precision you set.
How do I convert stone per cubic millimeter back to pound per imperial gallon?
Use the reverse factor: 1 stone per cubic millimeter equals 63,645,260 pounds per imperial gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per imperial gallon?
Pound per Imperial gallon (lb/imp gal) is a unit of density.
What is a stone per cubic millimeter?
Stone per Cubic Millimeter (st/mm3) is a unit of density.
Is the pound per imperial gallon to stone per cubic millimeter conversion exact?
Yes. Both pound per imperial gallon and stone per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 1.571209e-8 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.