Mass per volume density.
Stones per Teaspoon to Pounds per Cup Converter — st/tsp to lb/cup
Convert Stone per Teaspoon (st/tsp) to Pound per Cup (lb/cup) using the exact conversion factor (1 stone per teaspoon = 672 pound per cup). See the formula, worked examples, and conversion table.
Stones per Teaspoon to Pounds 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 / 1917.222837.
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 Cup
Stone per Teaspoon and Pound 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
pounds per cup = stones per teaspoon × 672
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 cup equals 1917.22283707 base units, so dividing one by the other gives the direct stone per teaspoon-to-pound per cup factor of 672.
Simple example
1 st/tsp × 672 = 672 lb/cup
1 stone per teaspoon = 672 pounds per cup.
Real-world example
1,000 st/tsp × 672 = 672,000 lb/cup
1,000 stones per teaspoon = 672,000 pounds per cup.
Conversion table
| Stone per Teaspoon (st/tsp) | Pound per Cup (lb/cup) |
|---|---|
| 0.1 st/tsp | 67.2 lb/cup |
| 1 st/tsp | 672 lb/cup |
| 10 st/tsp | 6,720 lb/cup |
| 100 st/tsp | 67,200 lb/cup |
| 1,000 st/tsp | 672,000 lb/cup |
| 10,000 st/tsp | 6,720,000 lb/cup |
Reverse conversion: Pound per Cup to Stone per Teaspoon
672 lb/cup × 0.001488095238 = 1 st/tsp
672 pounds per cup = 1 stone per teaspoon.
stones per teaspoon = pounds per cup × 0.0014880952381
For a page dedicated to this direction, see Pound per Cup to Stone per Teaspoon.
Understanding the Stone per Teaspoon (st/tsp)
Mass per volume density.
Understanding the Pound per Cup (lb/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many pounds per cup are in 1 stone per teaspoon?
1 stone per teaspoon equals 672 pounds per cup, using the exact defined conversion factor rather than an estimate.
How do I convert stone per teaspoon to pound per cup?
Multiply the stone per teaspoon value by 672. The converter above does this instantly to whatever precision you set.
How do I convert pound per cup back to stone per teaspoon?
Use the reverse factor: 1 pound per cup equals 0.0014880952 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 cup?
Pound per Cup (lb/cup) is a unit of density.
Is the stone per teaspoon to pound per cup conversion exact?
Yes. Both stone per teaspoon and pound per cup are defined by fixed standards rather than physical artifacts, so the factor of 672 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.