--- title: "20 gal to cup = 320 cup" description: "20 US gallons is 320 US cups. The arithmetic, a table of nearby values, and a converter for any other number." url: https://atoneplace.net/convert/20-gallons-to-cups/ site: "At One Place" --- # 20 gal to cup **20 US gallons in US cups: 20 gal = 320 cup** cup = gal × 16 20 US gallons is 320 US cups. To get there, multiply by 16. ## Values either side *US gallons near 20, converted to US cups.* | US gallons | US cups | | --- | --- | | 16 gal | 256 | | 17 gal | 272 | | 18 gal | 288 | | 19 gal | 304 | | 20 gal ← | 320 | | 21 gal | 336 | | 22 gal | 352 | | 23 gal | 368 | | 24 gal | 384 | ## How the conversion works The relationship is cup = gal × 16. 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. > US cup: US legal cup is 240 mL; the customary cup used here is 236.588 mL. ## Common questions ### What is 20 gal in US cups? 20 gal is 320 cup. ### How do you convert US gallons to US cups? Multiply by 16. ## Related pages - [US gallons to US cups](https://atoneplace.net/convert/gallons-to-cups/) - [20 cup to gal](https://atoneplace.net/convert/20-cups-to-gallons/) - [16 gal to cup](https://atoneplace.net/convert/16-gallons-to-cups/) - [17 gal to cup](https://atoneplace.net/convert/17-gallons-to-cups/) - [18 gal to cup](https://atoneplace.net/convert/18-gallons-to-cups/) - [19 gal to cup](https://atoneplace.net/convert/19-gallons-to-cups/) - [21 gal to cup](https://atoneplace.net/convert/21-gallons-to-cups/) - [22 gal to cup](https://atoneplace.net/convert/22-gallons-to-cups/) - [23 gal to cup](https://atoneplace.net/convert/23-gallons-to-cups/) - [24 gal to cup](https://atoneplace.net/convert/24-gallons-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/)