--- title: "21 qt to cup = 84 cup" description: "21 US quarts is 84 US cups. The arithmetic, a table of nearby values, and a converter for any other number." url: https://atoneplace.net/convert/21-quarts-to-cups/ site: "At One Place" --- # 21 qt to cup **21 US quarts in US cups: 21 qt = 84 cup** cup = qt × 4 21 US quarts is 84 US cups. To get there, multiply by 4. ## Values either side *US quarts near 21, converted to US cups.* | US quarts | US cups | | --- | --- | | 17 qt | 68 | | 18 qt | 72 | | 19 qt | 76 | | 20 qt | 80 | | 21 qt ← | 84 | | 22 qt | 88 | | 23 qt | 92 | | 24 qt | 96 | | 25 qt | 100 | ## How the conversion works The relationship is cup = qt × 4. Both units measure volume, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two. > US cup: US legal cup is 240 mL; the customary cup used here is 236.588 mL. ## Common questions ### What is 21 qt in US cups? 21 qt is 84 cup. ### How do you convert US quarts to US cups? Multiply by 4. ## Related pages - [US quarts to US cups](https://atoneplace.net/convert/quarts-to-cups/) - [21 cup to qt](https://atoneplace.net/convert/21-cups-to-quarts/) - [17 qt to cup](https://atoneplace.net/convert/17-quarts-to-cups/) - [18 qt to cup](https://atoneplace.net/convert/18-quarts-to-cups/) - [19 qt to cup](https://atoneplace.net/convert/19-quarts-to-cups/) - [20 qt to cup](https://atoneplace.net/convert/20-quarts-to-cups/) - [22 qt to cup](https://atoneplace.net/convert/22-quarts-to-cups/) - [23 qt to cup](https://atoneplace.net/convert/23-quarts-to-cups/) - [24 qt to cup](https://atoneplace.net/convert/24-quarts-to-cups/) - [25 qt to cup](https://atoneplace.net/convert/25-quarts-to-cups/) ## Sources - Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)] - The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure) - Calculated on this page — At One Place (/about/)