Cups to Quarts
Convert cups (cup) to quarts (qt). Both measure capacity and volume, and the conversion comes up in cooking, chemistry, fuel work.
The Formula
``
quarts = cups × 0.25
cups = quarts × 4
`
One cup is 0.25 quarts, and one quart is 4 cups.
Conversion Table
| Cups | Quarts |
|---|---|
| 1 cup | 0.25 qt |
| 2 cup | 0.5 qt |
| 5 cup | 1.25 qt |
| 10 cup | 2.5 qt |
| 25 cup | 6.25 qt |
| 50 cup | 12.5 qt |
| 100 cup | 25 qt |
| 500 cup | 125 qt |
| 1,000 cup | 250 qt |
The Other Direction
| Quarts | Cups |
|---|---|
| 1 qt | 4 cup |
| 2 qt | 8 cup |
| 5 qt | 20 cup |
| 10 qt | 40 cup |
| 25 qt | 100 cup |
| 50 qt | 200 cup |
| 100 qt | 400 cup |
| 500 qt | 2,000 cup |
| 1,000 qt | 4,000 cup |
What Each Unit Is
Cups (cup) — the US customary cup: exactly 240 millilitres in nutrition labelling, 236.588 mL legally. An American cooking measure standardised by Fannie Farmer in the 1890s.
Quarts (qt) — a quarter of a US gallon, or 0.946352946 litres. From the Latin quartus, a fourth part of a gallon.
A Sense of Scale
A coffee mug holds about 1.5 cups- US recipes measure everything in cups
- A US quart is just under a litre
- Ice cream is sold by the quart
- A quart is two pints
Precision
The factor 0.25 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
Watch Out For
- A US cup is 237 mL, a metric cup 250 mL and a Japanese cup 200 mL. Baking by volume is why the same recipe fails in another country.
In Code
`javascript
const cupToQuart = (value) => value * 0.25;
``
Where This Conversion Comes Up
- Cooking
- Chemistry
- Fuel
- Beverages
- Medicine
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 cup with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 cup becomes | Error |
|---|---|---|---|
| 0 | 0 | 0 | 100.0000% |
| 1 | 0.3 | 41.1 | 20.0000% |
| 2 | 0.25 | 34.25 | — |
| 3 | 0.25 | 34.25 | — |
| 4 | 0.25 | 34.25 | — |
The right number of significant figures is set by your input, not by the converter. If you measured cups to three significant figures, the answer in quarts is only good to three — writing more digits claims precision the measurement never had.