One million gallon have how much ton?

The weight of one million gallons of water is approximately 8,345 tons, since one gallon of water weighs about 8.34 pounds. To convert gallons to tons, you can multiply the number of gallons by the weight of a gallon in pounds and then convert pounds to tons (1 ton = 2,000 pounds). Therefore, 1,000,000 gallons x 8.34 pounds/gallon = 8,340,000 pounds, which equals about 4,170 tons.