Bottles of Water per Day Calculator
Pick your bottle, get a daily goal, and see how many fills that is, with drink-by times.
- Free
- No sign-up
- Runs in your browser
- Shows the math
Enter your weight or switch to “I have a goal” to see your bottles.
Daily goal − other drinks, divided by your bottle size
General information, not medical advice. Medical disclaimerWant to see how a goal is built? Open the Daily Water Intake Calculator.
Bottles in a day, by bottle size
Compare your number from the tool above. This table shows what a day’s worth of bottles adds up to. It isn't a target.
| Bottles per day | 16.9 fl oz (500 mL) | 24 fl oz | 32 fl oz | 40 fl oz |
|---|---|---|---|---|
| 2 bottles | 33.8 fl oz 1 L | 48 fl oz 1.42 L | 64 fl oz 1.89 L | 80 fl oz 2.37 L |
| 3 bottles | 50.7 fl oz 1.5 L | 72 fl oz 2.13 L | 96 fl oz 2.84 L | 120 fl oz 3.55 L |
| 4 bottles | 67.6 fl oz 2 L | 96 fl oz 2.84 L | 128 fl oz 3.79 L | 160 fl oz 4.73 L |
| 5 bottles | 84.5 fl oz 2.5 L | 120 fl oz 3.55 L | 160 fl oz 4.73 L | 200 fl oz 5.91 L |
| 6 bottles | 101.4 fl oz 3 L | 144 fl oz 4.26 L | 192 fl oz 5.68 L | 240 fl oz 7.1 L |
| 7 bottles | 118.3 fl oz 3.5 L | 168 fl oz 4.97 L | 224 fl oz 6.62 L | 280 fl oz 8.28 L |
| 8 bottles | 135.3 fl oz 4 L | 192 fl oz 5.68 L | 256 fl oz 7.57 L | 320 fl oz 9.46 L |
Worked example: a 2,650 mL goal and a 500 mL bottle
- 2,650 ÷ 500 = 5.3 bottles, which is 5 full bottles plus 150 mL.
- Wake at 7:00 AM, bed at 11:00 PM, and stop drinking 1 hour before bed. That leaves a 15-hour drinking window.
- Each bottle gets a share of the window in proportion to its size, rounded to 5 minutes.
- Bottle 1: by 9:50 AM
- Bottle 2: by 12:40 PM
- Bottle 3: by 3:30 PM
- Bottle 4: by 6:20 PM
- Bottle 5: by 9:10 PM
- Bottle 6 (the last 150 mL): by 10:00 PM
How it works
- Get a goal. Either estimate it from your weight and exercise with the same formula as the Daily Water Intake Calculator, or type your own.
- Subtract other drinks. Anything you enter under other drinks is counted as full fluid and taken off the goal. That's a convenience choice, not a finding that every drink hydrates alike.
- Divide by your bottle. The result is bottles to one decimal, full bottles plus the rest, and how many fills that takes.
- Spread it out. If you ask for times, the bottles are spaced evenly between waking and your cutoff before bed.
The calculator never says how many bottles is correct, because the answer depends on your bottle and your body. It shows its assumptions next to every result so you can check them.
When this number does not apply
- You're pregnant or breastfeeding.
- You have a kidney, heart or liver condition.
- You have been given a fluid limit or a specific drinking target.
- You take a medication that affects fluids or sodium.
- This is for a child or teen. The calculator is for adults.
Drinking steadily through the day is simpler than catching up at night. Mayo Clinic suggests drinking with meals, between meals, around exercise and when you feel thirsty.
Related
- Daily Water Intake CalculatorSee how a daily goal is built from weight and exercise.
- How Many Bottles of Water Are in a Gallon?Convert gallons, liters or ounces into bottles.
- What Counts as Water IntakeCoffee, tea, sparkling water and food.
- Is 64 oz of Water a Day Enough?Where the 8 glasses rule came from.
- How Much Water Is Too Much?Who is at risk of drinking too much and what to watch for.
Frequently asked questions
Is 4 bottles of water a day enough?
It depends on the size of the bottle and the size of the person. Four 16.9 oz bottles is 67.6 fl oz (2 L), and four 24 oz bottles is 96 fl oz (2.84 L). Compare either one with your own number from the calculator above rather than with a fixed count.
Does coffee count toward my bottles?
For most healthy adults, yes. The calculator lets you enter other drinks and counts them as full fluid, which is a convenience choice. What counts as water intake explains what the studies found and where full credit is a stretch.
What about 8 glasses a day?
Eight 8-ounce glasses is 64 fl oz, or 1,893 mL, which is about 3.8 bottles of 16.9 oz. Whether that fits you depends on your size and exercise. Is 64 oz of water a day enough? goes through it.
Should I drink right after waking up?
We have no source that sets a rule for that, so the calculator doesn't push one. The schedule here just spreads your bottles evenly across your day. Mayo Clinic suggests drinking with meals, between meals, around exercise and when you feel thirsty.
Can I drink it all at once?
The calculator assumes you spread your water through the day. We have no source on drinking a full day’s target in one go, so we don't suggest it. If you exercise for long stretches, the 2015 consensus statement on exercise-associated hyponatremia ties it to drinking more than you lose.
What if my bottle is 24 or 40 oz?
Pick it from the bottle list, or enter a custom size. A 2,650 mL goal is about 3.7 bottles of 24 oz or 2.2 bottles of 40 oz.
What counts as a bottle?
Whatever you fill and finish. Enter its size and the calculator divides your goal by it. Ounces on a label are US fluid ounces, and 16.9 oz is the same bottle as 500 mL.
Sources
- National Academies of Sciences, Engineering, and Medicine. News release, Feb. 11, 2004. Report sets dietary intake levels for water, salt, and potassium to maintain health and reduce chronic disease risk.
- Mayo Clinic. Water: How much should you drink every day?
- Sawka MN, Burke LM, Eichner ER, Maughan RJ, Montain SJ, Stachenfeld NS. American College of Sports Medicine position stand. Exercise and fluid replacement. Medicine & Science in Sports & Exercise 39(2):377-390. PubMed 17277604.
- Hew-Butler T, Rosner MH, Fowkes-Godek S, et al. Statement of the 3rd International Exercise-Associated Hyponatremia Consensus Development Conference, Carlsbad, California, 2015. British Journal of Sports Medicine 49(22):1432-1446. PubMed 26227507, DOI 10.1136/bjsports-2015-095004.
- NIST Special Publication 811, Appendix B.8. Factors for units listed by kind of quantity or field of science (volume).
How this page was built. The bottles-per-day calculator on Daily Water Calculator was built by Cedrick Reese. The goal comes from the same weight-and-exercise formula as the main calculator, and the bottle math and drink-by times were checked in code against the worked example on this page. The even spacing of bottles and the cutoff before bed are planning choices we made to keep the schedule simple. They aren't drawn from a published guideline. Last reviewed: .
General information for healthy adults, not medical advice. If you are pregnant or breastfeeding, or you have kidney, heart or liver conditions or a fluid limit, ask a clinician first. Terms and medical disclaimer.