Mass per volume density.
Pounds per Tablespoon to Ounces per Cup Converter — lb/tbsp to oz/cup
Convert Pound per Tablespoon (lb/tbsp) to Ounce per Cup (oz/cup) using the exact conversion factor (1 pound per tablespoon = 256 ounce per cup). See the formula, worked examples, and conversion table.
Pounds per Tablespoon to Ounces per Cup 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 30675.56539 / 119.8264273.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Tablespoon to Ounces per Cup
Pound per Tablespoon and Ounce per Cup 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
ounces per cup = pounds per tablespoon × 256
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per tablespoon equals 30675.5653931 base units, and 1 ounce per cup equals 119.826427317 base units, so dividing one by the other gives the direct pound per tablespoon-to-ounce per cup factor of 256.
Simple example
1 lb/tbsp × 256 = 256 oz/cup
1 pound per tablespoon = 256 ounces per cup.
Real-world example
1,000 lb/tbsp × 256 = 256,000 oz/cup
1,000 pounds per tablespoon = 256,000 ounces per cup.
Conversion table
| Pound per Tablespoon (lb/tbsp) | Ounce per Cup (oz/cup) |
|---|---|
| 0.1 lb/tbsp | 25.6 oz/cup |
| 1 lb/tbsp | 256 oz/cup |
| 10 lb/tbsp | 2,560 oz/cup |
| 100 lb/tbsp | 25,600 oz/cup |
| 1,000 lb/tbsp | 256,000 oz/cup |
| 10,000 lb/tbsp | 2,560,000 oz/cup |
Reverse conversion: Ounce per Cup to Pound per Tablespoon
256 oz/cup × 0.00390625 = 1 lb/tbsp
256 ounces per cup = 1 pound per tablespoon.
pounds per tablespoon = ounces per cup × 0.00390625
For a page dedicated to this direction, see Ounce per Cup to Pound per Tablespoon.
Understanding the Pound per Tablespoon (lb/tbsp)
Mass per volume density.
Understanding the Ounce per Cup (oz/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ounces per cup are in 1 pound per tablespoon?
1 pound per tablespoon equals 256 ounces per cup, using the exact defined conversion factor rather than an estimate.
How do I convert pound per tablespoon to ounce per cup?
Multiply the pound per tablespoon value by 256. The converter above does this instantly to whatever precision you set.
How do I convert ounce per cup back to pound per tablespoon?
Use the reverse factor: 1 ounce per cup equals 0.00390625 pounds per tablespoon. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per tablespoon?
Pound per Tablespoon (lb/tbsp) is a unit of density.
What is a ounce per cup?
Ounce per Cup (oz/cup) is a unit of density.
Is the pound per tablespoon to ounce per cup conversion exact?
Yes. Both pound per tablespoon and ounce per cup 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.