Water Bottle Refill Calculator
Enter your daily water intake goal and your bottle's size to calculate exactly how many refills you need each day to hit that goal.
Refills needed per day
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Enter your goal and bottle size to calculate.
How the Water Bottle Refill formula works
A straightforward division:
Refills needed = ceil( Daily water goal / Bottle size )
Step-by-step calculation
- Divide your daily water intake goal by your bottle's capacity.
- Round up to a whole refill, since a partial refill still counts as one fill-up.
Worked example
A 91 oz daily water goal with a 24 oz bottle: Refills = ceil(91/24) = ceil(3.79) = 4 refills per day.
Frequently asked questions
How do I know my daily water intake goal?
The Water Intake Calculator on this site estimates a daily goal based on body weight and activity level — use that figure here to find how it translates into refills for your specific bottle.
Does this count the first fill as a 'refill'?
This counts total fill-ups needed across the day, including the first one — treat the number as 'total times you need to fill the bottle,' not 'additional fills after the first.'