Mass per volume density.
Pounds per Fluid ounce to Drams per Fluid ounce Converter — lb/fl oz to dr/fl oz
Convert Pound per Fluid ounce (lb/fl oz) to Dram per Fluid ounce (dr/fl oz) using the exact conversion factor (1 pound per fluid ounce = 256 dram per fluid ounce). See the formula, worked examples, and conversion table.
Pounds per Fluid ounce to Drams per Fluid ounce 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 15337.7827 / 59.91321366.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Fluid ounce to Drams per Fluid ounce
Pound per Fluid ounce and Dram per Fluid ounce 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
drams per fluid ounce = pounds per fluid ounce × 256
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per fluid ounce equals 15337.7826966 base units, and 1 dram per fluid ounce equals 59.9132136584 base units, so dividing one by the other gives the direct pound per fluid ounce-to-dram per fluid ounce factor of 256.
Simple example
1 lb/fl oz × 256 = 256 dr/fl oz
1 pound per fluid ounce = 256 drams per fluid ounce.
Real-world example
1,000 lb/fl oz × 256 = 256,000 dr/fl oz
1,000 pounds per fluid ounce = 256,000 drams per fluid ounce.
Conversion table
| Pound per Fluid ounce (lb/fl oz) | Dram per Fluid ounce (dr/fl oz) |
|---|---|
| 0.1 lb/fl oz | 25.6 dr/fl oz |
| 1 lb/fl oz | 256 dr/fl oz |
| 10 lb/fl oz | 2,560 dr/fl oz |
| 100 lb/fl oz | 25,600 dr/fl oz |
| 1,000 lb/fl oz | 256,000 dr/fl oz |
| 10,000 lb/fl oz | 2,560,000 dr/fl oz |
Reverse conversion: Dram per Fluid ounce to Pound per Fluid ounce
256 dr/fl oz × 0.00390625 = 1 lb/fl oz
256 drams per fluid ounce = 1 pound per fluid ounce.
pounds per fluid ounce = drams per fluid ounce × 0.00390625
For a page dedicated to this direction, see Dram per Fluid ounce to Pound per Fluid ounce.
Understanding the Pound per Fluid ounce (lb/fl oz)
Mass per volume density.
Understanding the Dram per Fluid ounce (dr/fl oz)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many drams per fluid ounce are in 1 pound per fluid ounce?
1 pound per fluid ounce equals 256 drams per fluid ounce, using the exact defined conversion factor rather than an estimate.
How do I convert pound per fluid ounce to dram per fluid ounce?
Multiply the pound per fluid ounce value by 256. The converter above does this instantly to whatever precision you set.
How do I convert dram per fluid ounce back to pound per fluid ounce?
Use the reverse factor: 1 dram per fluid ounce equals 0.00390625 pounds per fluid ounce. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per fluid ounce?
Pound per Fluid ounce (lb/fl oz) is a unit of density.
What is a dram per fluid ounce?
Dram per Fluid ounce (dr/fl oz) is a unit of density.
Is the pound per fluid ounce to dram per fluid ounce conversion exact?
Yes. Both pound per fluid ounce and dram per fluid ounce are defined by fixed standards rather than physical artifacts, so the factor of 256 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.