John 2:6

Now six stone water jars had been set there for the Jewish rites of purification. Each could hold from twenty to thirty gallons.

Note Greek two or three metretae; that is, approximately 20.8 to 31.2 gallons (78.8 to 118.1 liters)

BSB · Berean Standard Bible
And there were set there six waterpots of stone, after the manner of the purifying of the Jews, containing two or three firkins apiece.
KJV · King James Version
Now there were six water pots of stone set there after the Jews’ way of purifying, containing two or three metretes apiece.

Note 2 to 3 metretes is about 20 to 30 U. S. Gallons, or 75 to 115 liters.

WEB · World English Bible
Now there were six waterpots of stone set there after the Jews’ manner of purifying, containing two or three firkins apiece.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

after
John 3:25; Mark 7:2–5; Ephesians 5:26; Hebrews 6:2; Hebrews 9:10, 19; Hebrews 10:22