Mass per volume density.
Stones per Teaspoon to Pounds per Tablespoon Converter — st/tsp to lb/tbsp
Convert Stone per Teaspoon (st/tsp) to Pound per Tablespoon (lb/tbsp) using the exact conversion factor (1 stone per teaspoon = 42 pound per tablespoon). See the formula, worked examples, and conversion table.
Stones per Teaspoon to Pounds 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 1.28837375e+6 / 30675.56539.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Stones per Teaspoon to Pounds per Tablespoon
Stone per Teaspoon and Pound 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
pounds per tablespoon = stones per teaspoon × 42
This factor comes from each unit's defined relationship to the category's base unit: 1 stone per teaspoon equals 1288373.74651 base units, and 1 pound per tablespoon equals 30675.5653931 base units, so dividing one by the other gives the direct stone per teaspoon-to-pound per tablespoon factor of 42.
Simple example
1 st/tsp × 42 = 42 lb/tbsp
1 stone per teaspoon = 42 pounds per tablespoon.
Real-world example
1,000 st/tsp × 42 = 42,000 lb/tbsp
1,000 stones per teaspoon = 42,000 pounds per tablespoon.
Conversion table
| Stone per Teaspoon (st/tsp) | Pound per Tablespoon (lb/tbsp) |
|---|---|
| 0.1 st/tsp | 4.2 lb/tbsp |
| 1 st/tsp | 42 lb/tbsp |
| 10 st/tsp | 420 lb/tbsp |
| 100 st/tsp | 4,200 lb/tbsp |
| 1,000 st/tsp | 42,000 lb/tbsp |
| 10,000 st/tsp | 420,000 lb/tbsp |
Reverse conversion: Pound per Tablespoon to Stone per Teaspoon
42 lb/tbsp × 0.02380952381 = 1 st/tsp
42 pounds per tablespoon = 1 stone per teaspoon.
stones per teaspoon = pounds per tablespoon × 0.0238095238095
For a page dedicated to this direction, see Pound per Tablespoon to Stone per Teaspoon.
Understanding the Stone per Teaspoon (st/tsp)
Mass per volume density.
Understanding the Pound per Tablespoon (lb/tbsp)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per tablespoon are in 1 stone per teaspoon?
1 stone per teaspoon equals 42 pounds per tablespoon, using the exact defined conversion factor rather than an estimate.
How do I convert stone per teaspoon to pound per tablespoon?
Multiply the stone per teaspoon value by 42. The converter above does this instantly to whatever precision you set.
How do I convert pound per tablespoon back to stone per teaspoon?
Use the reverse factor: 1 pound per tablespoon equals 0.0238095238 stones per teaspoon. You can also use the swap control in the converter above to flip the direction instantly.
What is a stone per teaspoon?
Stone per Teaspoon (st/tsp) is a unit of density.
What is a pound per tablespoon?
Pound per Tablespoon (lb/tbsp) is a unit of density.
Is the stone per teaspoon to pound per tablespoon conversion exact?
Yes. Both stone per teaspoon and pound per tablespoon are defined by fixed standards rather than physical artifacts, so the factor of 42 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.