Question: how many ml is 8 glasses of water per day?
Answer: One theory suggests it may have originated in 1945, when one research organization released a report stating that the average person needs to consume 1 ml of water per calorie of food they consume. For someone eating a diet of 2,000 calories per day, this adds up to 2,000 ml (roughly 64 oz), or eight 8-oz glasses.