Mass per volume density.
Pounds per Cup to Stones per Tablespoon Converter — lb/cup to st/tbsp
Convert Pound per Cup (lb/cup) to Stone per Tablespoon (st/tbsp) using the exact conversion factor (1 pound per cup = 0.0044642857 stone per tablespoon). See the formula, worked examples, and conversion table.
Pounds per Cup to Stones per Tablespoon 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 1917.222837 / 429457.9155.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pounds per Cup to Stones per Tablespoon
Pound per Cup and Stone per Tablespoon 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 tablespoon = pounds per cup × 0.00446428571429
This factor comes from each unit's defined relationship to the category's base unit: 1 pound per cup equals 1917.22283707 base units, and 1 stone per tablespoon equals 429457.915504 base units, so dividing one by the other gives the direct pound per cup-to-stone per tablespoon factor of 0.00446428571429.
Simple example
1 lb/cup × 0.004464285714 = 0.0044642857 st/tbsp
1 pound per cup = 0.0044642857 stones per tablespoon.
Real-world example
1,000 lb/cup × 0.004464285714 = 4.464285714 st/tbsp
1,000 pounds per cup = 4.464285714 stones per tablespoon.
Conversion table
| Pound per Cup (lb/cup) | Stone per Tablespoon (st/tbsp) |
|---|---|
| 0.1 lb/cup | 0.0004464286 st/tbsp |
| 1 lb/cup | 0.0044642857 st/tbsp |
| 10 lb/cup | 0.0446428571 st/tbsp |
| 100 lb/cup | 0.4464285714 st/tbsp |
| 1,000 lb/cup | 4.464285714 st/tbsp |
| 10,000 lb/cup | 44.64285714 st/tbsp |
Reverse conversion: Stone per Tablespoon to Pound per Cup
0.0044642857 st/tbsp × 224 = 0.9999999968 lb/cup
0.0044642857 stones per tablespoon = 0.9999999968 pounds per cup.
pounds per cup = stones per tablespoon × 224
For a page dedicated to this direction, see Stone per Tablespoon to Pound per Cup.
Understanding the Pound per Cup (lb/cup)
Mass per volume density.
Understanding the Stone per Tablespoon (st/tbsp)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per tablespoon are in 1 pound per cup?
1 pound per cup equals 0.0044642857 stones per tablespoon, using the exact defined conversion factor rather than an estimate.
How do I convert pound per cup to stone per tablespoon?
Multiply the pound per cup value by 0.004464285714. The converter above does this instantly to whatever precision you set.
How do I convert stone per tablespoon back to pound per cup?
Use the reverse factor: 1 stone per tablespoon equals 224 pounds per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound per cup?
Pound per Cup (lb/cup) is a unit of density.
What is a stone per tablespoon?
Stone per Tablespoon (st/tbsp) is a unit of density.
Is the pound per cup to stone per tablespoon conversion exact?
Yes. Both pound per cup and stone per tablespoon are defined by fixed standards rather than physical artifacts, so the factor of 0.004464285714 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.