Mass per volume density.
Pounds per Tablespoon to Stones per Cup Converter — lb/tbsp to st/cup
Convert Pound per Tablespoon (lb/tbsp) to Stone per Cup (st/cup) using the exact conversion factor (1 pound per tablespoon = 1.142857143 stone per cup). See the formula, worked examples, and conversion table.
Pounds per Tablespoon to Stones 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 / 26841.11972.
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 Stones per Cup
Pound per Tablespoon and Stone 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
stones per cup = pounds per tablespoon × 1.14285714286
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 stone per cup equals 26841.119719 base units, so dividing one by the other gives the direct pound per tablespoon-to-stone per cup factor of 1.14285714286.
Simple example
1 lb/tbsp × 1.142857143 = 1.142857143 st/cup
1 pound per tablespoon = 1.142857143 stones per cup.
Real-world example
1,000 lb/tbsp × 1.142857143 = 1,142.857143 st/cup
1,000 pounds per tablespoon = 1,142.857143 stones per cup.
Conversion table
| Pound per Tablespoon (lb/tbsp) | Stone per Cup (st/cup) |
|---|---|
| 0.1 lb/tbsp | 0.1142857143 st/cup |
| 1 lb/tbsp | 1.142857143 st/cup |
| 10 lb/tbsp | 11.42857143 st/cup |
| 100 lb/tbsp | 114.2857143 st/cup |
| 1,000 lb/tbsp | 1,142.857143 st/cup |
| 10,000 lb/tbsp | 11,428.57143 st/cup |
Reverse conversion: Stone per Cup to Pound per Tablespoon
1.142857143 st/cup × 0.875 = 1 lb/tbsp
1.142857143 stones per cup = 1 pounds per tablespoon.
pounds per tablespoon = stones per cup × 0.875
For a page dedicated to this direction, see Stone per Cup to Pound per Tablespoon.
Understanding the Pound per Tablespoon (lb/tbsp)
Mass per volume density.
Understanding the Stone per Cup (st/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per cup are in 1 pound per tablespoon?
1 pound per tablespoon equals 1.142857143 stones per cup, using the exact defined conversion factor rather than an estimate.
How do I convert pound per tablespoon to stone per cup?
Multiply the pound per tablespoon value by 1.142857143. The converter above does this instantly to whatever precision you set.
How do I convert stone per cup back to pound per tablespoon?
Use the reverse factor: 1 stone per cup equals 0.875 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 stone per cup?
Stone per Cup (st/cup) is a unit of density.
Is the pound per tablespoon to stone per cup conversion exact?
Yes. Both pound per tablespoon and stone per cup are defined by fixed standards rather than physical artifacts, so the factor of 1.142857143 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.