Mass per volume density.
Long tons per Cup to Stones per Quart Converter — long ton/cup to st/qt
Convert Long ton per Cup (long ton/cup) to Stone per Quart (st/qt) using the exact conversion factor (1 long ton per cup = 640 stone per quart). See the formula, worked examples, and conversion table.
Long tons per Cup to Stones per Quart 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 4.29457916e+6 / 6710.27993.
Density uses kilograms per cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Long tons per Cup to Stones per Quart
Long ton per Cup and Stone per Quart 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 quart = long tons per cup × 640
This factor comes from each unit's defined relationship to the category's base unit: 1 long ton per cup equals 4294579.15504 base units, and 1 stone per quart equals 6710.27992975 base units, so dividing one by the other gives the direct long ton per cup-to-stone per quart factor of 640.
Simple example
1 long ton/cup × 640 = 640 st/qt
1 long ton per cup = 640 stones per quart.
Real-world example
1,000 long ton/cup × 640 = 640,000 st/qt
1,000 long tons per cup = 640,000 stones per quart.
Conversion table
| Long ton per Cup (long ton/cup) | Stone per Quart (st/qt) |
|---|---|
| 0.1 long ton/cup | 64 st/qt |
| 1 long ton/cup | 640 st/qt |
| 10 long ton/cup | 6,400 st/qt |
| 100 long ton/cup | 64,000 st/qt |
| 1,000 long ton/cup | 640,000 st/qt |
| 10,000 long ton/cup | 6,400,000 st/qt |
Reverse conversion: Stone per Quart to Long ton per Cup
640 st/qt × 0.0015625 = 1 long ton/cup
640 stones per quart = 1 long tons per cup.
long tons per cup = stones per quart × 0.0015625
For a page dedicated to this direction, see Stone per Quart to Long ton per Cup.
Understanding the Long ton per Cup (long ton/cup)
Mass per volume density.
Understanding the Stone per Quart (st/qt)
Mass per volume density.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones per quart are in 1 long ton per cup?
1 long ton per cup equals 640 stones per quart, using the exact defined conversion factor rather than an estimate.
How do I convert long ton per cup to stone per quart?
Multiply the long ton per cup value by 640. The converter above does this instantly to whatever precision you set.
How do I convert stone per quart back to long ton per cup?
Use the reverse factor: 1 stone per quart equals 0.0015625 long tons per cup. You can also use the swap control in the converter above to flip the direction instantly.
What is a long ton per cup?
Long ton per Cup (long ton/cup) is a unit of density.
What is a stone per quart?
Stone per Quart (st/qt) is a unit of density.
Is the long ton per cup to stone per quart conversion exact?
Yes. Both long ton per cup and stone per quart are defined by fixed standards rather than physical artifacts, so the factor of 640 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.