Mass per volume density.
Stones per Teaspoon to Kilograms per Cup Converter — st/tsp to kg/cup
Convert Stone per Teaspoon (st/tsp) to Kilogram per Cup (kg/cup) using the exact conversion factor (1 stone per teaspoon = 304.8140726 kilogram per cup). See the formula, worked examples, and conversion table.
Stones per Teaspoon to Kilograms 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 / 4226.752838.
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 Kilograms per Cup
Stone per Teaspoon and Kilogram 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
kilograms per cup = stones per teaspoon × 304.81407264
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 kilogram per cup equals 4226.75283773 base units, so dividing one by the other gives the direct stone per teaspoon-to-kilogram per cup factor of 304.81407264.
Simple example
1 st/tsp × 304.8140726 = 304.8140726 kg/cup
1 stone per teaspoon = 304.8140726 kilograms per cup.
Real-world example
1,000 st/tsp × 304.8140726 = 304,814.0726 kg/cup
1,000 stones per teaspoon = 304,814.0726 kilograms per cup.
Conversion table
| Stone per Teaspoon (st/tsp) | Kilogram per Cup (kg/cup) |
|---|---|
| 0.1 st/tsp | 30.48140726 kg/cup |
| 1 st/tsp | 304.8140726 kg/cup |
| 10 st/tsp | 3,048.140726 kg/cup |
| 100 st/tsp | 30,481.40726 kg/cup |
| 1,000 st/tsp | 304,814.0726 kg/cup |
| 10,000 st/tsp | 3,048,140.726 kg/cup |
Reverse conversion: Kilogram per Cup to Stone per Teaspoon
304.8140726 kg/cup × 0.003280688425 = 0.9999999999 st/tsp
304.8140726 kilograms per cup = 0.9999999999 stones per teaspoon.
stones per teaspoon = kilograms per cup × 0.00328068842537
For a page dedicated to this direction, see Kilogram per Cup to Stone per Teaspoon.
Understanding the Stone per Teaspoon (st/tsp)
Mass per volume density.
Understanding the Kilogram per Cup (kg/cup)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilograms per cup are in 1 stone per teaspoon?
1 stone per teaspoon equals 304.8140726 kilograms per cup, using the exact defined conversion factor rather than an estimate.
How do I convert stone per teaspoon to kilogram per cup?
Multiply the stone per teaspoon value by 304.8140726. The converter above does this instantly to whatever precision you set.
How do I convert kilogram per cup back to stone per teaspoon?
Use the reverse factor: 1 kilogram per cup equals 0.0032806884 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 kilogram per cup?
Kilogram per Cup (kg/cup) is a unit of density.
Is the stone per teaspoon to kilogram per cup conversion exact?
Yes. Both stone per teaspoon and kilogram per cup are defined by fixed standards rather than physical artifacts, so the factor of 304.8140726 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.