Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Health, Fitness & Wellness
Daily Water Intake Calculator by Weight and Activity
Base 35 ml/kg + exercise bonus; hot climate adds ~10%.
Estimate daily water needs from weight, exercise, and climate. Estimates only—not a diagnosis or prescription.
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Inputs save on this device only. Share a link to reopen your exact numbers.
Inputs
80350
0180
01
Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Daily water target = 3.1 L. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
Scenario studio
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Scenario A
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Scenario B
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Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Weight (lbs)
The “Weight (lbs)” value used in this tool’s formula. Adjust it to see results update live.
Exercise (min/day)
The “Exercise (min/day)” value used in this tool’s formula. Adjust it to see results update live.
Hot climate (0=no, 1=yes)
The “Hot climate (0=no, 1=yes)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Estimate daily water needs from weight, exercise, and climate. Estimates only—not a diagnosis or prescription. Base 35 ml/kg + exercise bonus; hot climate adds ~10%. Example: 170 lb, 30 min exercise → ~2.7–3.0 L/day target.
Base 35 ml/kg + exercise bonus; hot climate adds ~10%.
Example: 170 lb, 30 min exercise → ~2.7–3.0 L/day target.
When to use this Daily Water Intake
Common use cases
- Estimate daily water needs from weight, exercise, and climate.
- Sanity-check with this case: 170 lb, 30 min exercise → ~2.7–3.0 L/day target.
- The relationship is: Base 35 ml/kg + exercise bonus; hot climate adds ~10%.
Localized examples
- Health, Fitness & Wellness: the example on this page uses the same formula as the widget.
What you get
- Fields: Weight (lbs), Exercise (min/day), Hot climate (0=no, 1=yes)
- Base 35 ml/kg + exercise bonus; hot climate adds ~10%.
- Example on the page: 170 lb, 30 min exercise → ~2.7–3.0 L/day target.
How to Calculate Daily Water Intake Step-by-Step
- 1Enter Weight (lbs), Exercise (min/day), Hot climate (0=no, 1=yes). Use the values you have, not a catalog average, unless that is all you know.
- 2Base 35 ml/kg + exercise bonus; hot climate adds ~10%.
- 3Worked case: 170 lb, 30 min exercise → ~2.7–3.0 L/day target.
- 4If this number would change a drug, a diet, or a return-to-play call, take it to a clinician. The page never examined you.
Governing formula
Base 35 ml/kg + exercise bonus; hot climate adds ~10%.
170 lb, 30 min exercise → ~2.7–3.0 L/day target.
Example: set Weight (lbs) = 170, Exercise (min/day) = 30, Hot climate (0=no, 1=yes) = 0, then read the result.
Variable definitions
- weightLbs
Weight (lbs)
The “Weight (lbs)” field. Default 170; typical range 80–350.
- exerciseMin
Exercise (min/day)
The “Exercise (min/day)” field. Default 30; typical range 0–180.
- hotClimate
Hot climate (0=no, 1=yes)
The “Hot climate (0=no, 1=yes)” field. Default 0; typical range 0–1.
- The formula (Base 35 ml/kg + exercise bonus; hot climate adds ~10%.) does not see labs, medications, sleep, or injury history. A clinician does.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Base 35 ml/kg + exercise bonus; hot climate adds ~10%.
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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