Water Bottle Math › 40 oz
How Many 40 oz Water Bottles Are in a Gallon?
The quick answer, a chart for every common water goal, and a calculator for yours.
40 oz (a large tumbler)3.2 bottlesmake one US gallon (128 fl oz) · about 3¼
How many 40 oz bottles for common goals
| Goal | Bottles | In plain words |
|---|---|---|
| a gallon | 3.2 bottles | about 3¼ |
| half a gallon | 1.6 bottles | about 1½ |
| 64 oz | 1.6 bottles | about 1½ |
| 100 oz | 2.5 bottles | about 2½ |
| 2 liters | 1.69 bottles | about 1¾ |
| 3 liters | 2.54 bottles | about 2½ |
| 8 cups (8 oz each) | 1.6 bottles | about 1½ |
| 120 oz | 3 bottles | exactly 3 |
Your own goal
How the maths works
Divide your goal in fluid ounces by the bottle size. One US gallon is 128 fl oz and one liter is 33.81 fl oz. Round up if you want to be sure you hit the goal.
Questions
How many 40 oz water bottles make a gallon?
3.2 bottles. A US gallon is 128 fl oz, and 128 ÷ 40 = 3.2.
How many 40 oz bottles are 64 oz?
1.6 bottles.
How much water should I drink a day?
It varies with body size, activity, climate and health. The US National Academies suggest about 3.7 liters of total water a day for men and 2.7 for women, including water from food. Your doctor can advise you.