Pregnancy, breastfeeding, illness, fluid restrictions, endurance exercise and extreme heat need different guidance. Read the limits →
Where do these numbers come from?＋
The U.S. National Academies report lists adult total-water references of 2.7 L for women and 3.7 L for men. Its accompanying beverage amounts are approximately 2.2 L and 3.0 L. Food provides the remaining 0.5 L and 0.7 L in that table; these are not measurements of your diet.
Reference mode converts those beverage amounts into US fluid ounces and your selected container size. Convert mode divides a volume you enter by your bottle capacity; it does not calculate a daily target. Your age range determines whether this adult reference applies. Your day changes the guidance beside it. Neither changes the published amount; we do not calculate a medical requirement from weight, age, heat or exercise.
Two liters is 2,000 ml, or approximately 67.63 US fluid ounces. A partial bottle means you only need the listed remainder to make up that volume.
Volume equivalents for 2 liters (amounts rounded)
Bottle capacity
Bottle equivalents
Full bottles + remainder
330 ml
6.06
6 full + 20 ml
500 ml
4
4 full — no remainder
750 ml
2.67
2 full + 500 ml
1 liter
2
2 full — no remainder
16.9 US fl oz
4
4 full + 0.8 ml
20 US fl oz
3.38
3 full + 225.6 ml
24 US fl oz
2.82
2 full + 580.5 ml
32 US fl oz
2.11
2 full + 107.3 ml
40 US fl oz
1.69
1 full + 817.1 ml
How to calculate it
Bottle equivalents = 2,000 ml ÷ bottle capacity in ml. For a 750 ml bottle: 2,000 ÷ 750 = approximately 2.67 bottles. Two full bottles hold 1,500 ml, leaving 500 ml for another bottle.
For a different amount, multiply liters by 1,000 first. For example, 1.5 liters is 1,500 ml, which fills three 500 ml bottles. The converter above lets you change both the amount and bottle size.
Is a 16.9 oz bottle the same as 500 ml?
They are very close, but the labels are rounded. Using the US fluid-ounce conversion, 16.9 US fl oz is about 499.8 ml. Four such bottles total about 1,999.2 ml. If the bottle is labeled 500 ml, use 500 ml for your calculation; it gives exactly four bottles.
All ounce conversions here use US fluid ounces, a unit of volume, not ounces of weight or Imperial fluid ounces. One US fluid ounce is approximately 29.5735 ml.
Does this mean I should drink four bottles every day?