Daily Water Intake by Weight
Daily Water Intake by Weight: free, instant and private. This covers total fluids including tea, milk and food moisture — not just plain water.
How the Daily Water Intake by Weight works
The Daily Water Intake by Weight takes Weight (kg), Activity level and returns the answer instantly — no button to hunt for, no page reload. This covers total fluids including tea, milk and food moisture — not just plain water. Hot weather, illness and pregnancy all push the need higher than the estimate.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
water (litres) = weight × 0.033 + activity adjustment
| Symbol | Meaning |
|---|---|
| weight | kilograms |
| activity | low, moderate or high training load |
This covers total fluids including tea, milk and food moisture — not just plain water. Hot weather, illness and pregnancy all push the need higher than the estimate.
Inputs used: Weight (kg), Activity level.
Worked example
Take the default example — weight (kg) of 80, activity level set to High:
- Litres per day: 3.34
- Glasses (250ml): 14
Frequently asked questions
- What formula does the Daily Water Intake by Weight use?
- It uses water (litres) = weight × 0.033 + activity adjustment, where weight is the kilograms; activity is the low, moderate or high training load.
- Is the Daily Water Intake by Weight free?
- Yes. There is no signup, no usage limit and no watermark — the calculator runs entirely in your browser.
- How do I read the result?
- This covers total fluids including tea, milk and food moisture — not just plain water. Hot weather, illness and pregnancy all push the need higher than the estimate.
- Does the Daily Water Intake by Weight store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.