--- title: "21 gal to qt = 84 qt" description: "21 US gallons is 84 US quarts. The arithmetic, a table of nearby values, and a converter for any other number." url: https://atoneplace.net/convert/21-gallons-to-quarts/ site: "At One Place" --- # 21 gal to qt **21 US gallons in US quarts: 21 gal = 84 qt** qt = gal × 4 21 US gallons is 84 US quarts. To get there, multiply by 4. ## Values either side *US gallons near 21, converted to US quarts.* | US gallons | US quarts | | --- | --- | | 17 gal | 68 | | 18 gal | 72 | | 19 gal | 76 | | 20 gal | 80 | | 21 gal ← | 84 | | 22 gal | 88 | | 23 gal | 92 | | 24 gal | 96 | | 25 gal | 100 | ## How the conversion works The relationship is qt = gal × 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 gallon: US liquid gallon. The imperial gallon is about 20% larger. ## Common questions ### What is 21 gal in US quarts? 21 gal is 84 qt. ### How do you convert US gallons to US quarts? Multiply by 4. ## Related pages - [US gallons to US quarts](https://atoneplace.net/convert/gallons-to-quarts/) - [21 qt to gal](https://atoneplace.net/convert/21-quarts-to-gallons/) - [17 gal to qt](https://atoneplace.net/convert/17-gallons-to-quarts/) - [18 gal to qt](https://atoneplace.net/convert/18-gallons-to-quarts/) - [19 gal to qt](https://atoneplace.net/convert/19-gallons-to-quarts/) - [20 gal to qt](https://atoneplace.net/convert/20-gallons-to-quarts/) - [22 gal to qt](https://atoneplace.net/convert/22-gallons-to-quarts/) - [23 gal to qt](https://atoneplace.net/convert/23-gallons-to-quarts/) - [24 gal to qt](https://atoneplace.net/convert/24-gallons-to-quarts/) - [25 gal to qt](https://atoneplace.net/convert/25-gallons-to-quarts/) ## 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/)