Mass per volume density.
Ounce per Cubic inches to Pounds per Cubic Millimeter Converter — oz/in3 to lb/mm3
Convert Ounce per Cubic inch (oz/in3) to Pound per Cubic Millimeter (lb/mm3) using the exact conversion factor (1 ounce per cubic inch = 0.000003814 pound per cubic millimeter). See the formula, worked examples, and conversion table.
Ounce per Cubic inches 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 1729.994044 / 4.5359237e+8.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ounce per Cubic inches to Pounds per Cubic Millimeter
Ounce per Cubic inch 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 = ounce per cubic inches × 0.00000381398400592
This factor comes from each unit's defined relationship to the category's base unit: 1 ounce per cubic inch equals 1729.99404439 base units, and 1 pound per cubic millimeter equals 453592370 base units, so dividing one by the other gives the direct ounce per cubic inch-to-pound per cubic millimeter factor of 0.00000381398400592.
Simple example
1 oz/in3 × 0.000003813984006 = 0.000003814 lb/mm3
1 ounce per cubic inch = 0.000003814 pounds per cubic millimeter.
Real-world example
1,000 oz/in3 × 0.000003813984006 = 0.003813984 lb/mm3
1,000 ounce per cubic inches = 0.003813984 pounds per cubic millimeter.
Conversion table
| Ounce per Cubic inch (oz/in3) | Pound per Cubic Millimeter (lb/mm3) |
|---|---|
| 0.1 oz/in3 | 3.813984e-7 lb/mm3 |
| 1 oz/in3 | 0.000003814 lb/mm3 |
| 10 oz/in3 | 0.0000381398 lb/mm3 |
| 100 oz/in3 | 0.0003813984 lb/mm3 |
| 1,000 oz/in3 | 0.003813984 lb/mm3 |
| 10,000 oz/in3 | 0.0381398401 lb/mm3 |
Reverse conversion: Pound per Cubic Millimeter to Ounce per Cubic inch
0.000003814 lb/mm3 × 262193.024 = 1.000004194 oz/in3
0.000003814 pounds per cubic millimeter = 1.000004194 ounce per cubic inches.
ounce per cubic inches = pounds per cubic millimeter × 262193.024
For a page dedicated to this direction, see Pound per Cubic Millimeter to Ounce per Cubic inch.
Understanding the Ounce per Cubic inch (oz/in3)
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 ounce per cubic inch?
1 ounce per cubic inch equals 0.000003814 pounds per cubic millimeter, using the exact defined conversion factor rather than an estimate.
How do I convert ounce per cubic inch to pound per cubic millimeter?
Multiply the ounce per cubic inch value by 0.000003813984006. The converter above does this instantly to whatever precision you set.
How do I convert pound per cubic millimeter back to ounce per cubic inch?
Use the reverse factor: 1 pound per cubic millimeter equals 262,193.024 ounce per cubic inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a ounce per cubic inch?
Ounce per Cubic inch (oz/in3) 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 ounce per cubic inch to pound per cubic millimeter conversion exact?
Yes. Both ounce per cubic inch and pound per cubic millimeter are defined by fixed standards rather than physical artifacts, so the factor of 0.000003813984006 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.