Mass per volume density.
Stones per Teaspoon to Slugs per Cup Converter — st/tsp to slug/cup
Convert Stone per Teaspoon (st/tsp) to Slug per Cup (slug/cup) using the exact conversion factor (1 stone per teaspoon = 20.88639852 slug per cup). See the formula, worked examples, and conversion table.
Stones per Teaspoon to Slugs 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 1.28837375e+6 / 61684.82065.
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 Slugs per Cup
Stone per Teaspoon and Slug 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
slugs per cup = stones per teaspoon × 20.8863985153
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 slug per cup equals 61684.8206534 base units, so dividing one by the other gives the direct stone per teaspoon-to-slug per cup factor of 20.8863985153.
Simple example
1 st/tsp × 20.88639852 = 20.88639852 slug/cup
1 stone per teaspoon = 20.88639852 slugs per cup.
Real-world example
1,000 st/tsp × 20.88639852 = 20,886.39852 slug/cup
1,000 stones per teaspoon = 20,886.39852 slugs per cup.
Conversion table
| Stone per Teaspoon (st/tsp) | Slug per Cup (slug/cup) |
|---|---|
| 0.1 st/tsp | 2.088639852 slug/cup |
| 1 st/tsp | 20.88639852 slug/cup |
| 10 st/tsp | 208.8639852 slug/cup |
| 100 st/tsp | 2,088.639852 slug/cup |
| 1,000 st/tsp | 20,886.39852 slug/cup |
| 10,000 st/tsp | 208,863.9852 slug/cup |
Reverse conversion: Slug per Cup to Stone per Teaspoon
20.88639852 slug/cup × 0.04787804845 = 1 st/tsp
20.88639852 slugs per cup = 1 stones per teaspoon.
stones per teaspoon = slugs per cup × 0.047878048447
For a page dedicated to this direction, see Slug per Cup to Stone per Teaspoon.
Understanding the Stone per Teaspoon (st/tsp)
Mass per volume density.
Understanding the Slug per Cup (slug/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many slugs per cup are in 1 stone per teaspoon?
1 stone per teaspoon equals 20.88639852 slugs per cup, using the exact defined conversion factor rather than an estimate.
How do I convert stone per teaspoon to slug per cup?
Multiply the stone per teaspoon value by 20.88639852. The converter above does this instantly to whatever precision you set.
How do I convert slug per cup back to stone per teaspoon?
Use the reverse factor: 1 slug per cup equals 0.0478780485 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 slug per cup?
Slug per Cup (slug/cup) is a unit of density.
Is the stone per teaspoon to slug per cup conversion exact?
Yes. Both stone per teaspoon and slug per cup are defined by fixed standards rather than physical artifacts, so the factor of 20.88639852 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.