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Daily Water Intake Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Recommended water
2.66
- Approx. glasses (250 ml)
- 11
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Daily Water Intake Calculator
The Daily Water Intake Calculator works out your recommended water, along with 1 related figure in an instant. Enter body weight and daily exercise and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the body weight.
- Enter the daily exercise.
- Read off your recommended water, together with approx. glasses (250 ml) — the calculator updates automatically, with no button to press.
Formula
The Daily Water Intake Calculator uses the formula:
Recommended water = Body weight × 0.033 + Daily exercise ÷ 30 × 0.35
Worked example
For example, with body weight of 70 kg and daily exercise of 30 minutes, the recommended water is 2.66.
| Body weight | 70 kg |
|---|---|
| Daily exercise | 30 minutes |
| Recommended water | 2.66 |
|---|---|
| Approx. glasses (250 ml) | 11 |
Results are estimates for educational use, not professional advice.
Frequently asked questions
A common guide is about 33 ml per kg of body weight, plus extra for exercise. For 70 kg with 30 minutes of activity this is roughly 2.7 litres, but needs vary by person and climate.
Yes. You lose water through sweat, so this calculator adds about 350 ml for every 30 minutes of exercise. Hot weather increases needs further.
Yes. Foods, especially fruit and vegetables, and other drinks all contribute. The figure here is a target for total fluids, not water alone.
Rarely, but drinking very large amounts very quickly can be harmful. Spread your intake through the day and listen to your thirst.
The Daily Water Intake Calculator uses the formula: Recommended water = Body weight × 0.033 + Daily exercise ÷ 30 × 0.35. For example, with body weight of 70 kg and daily exercise of 30 minutes, the recommended water is 2.66.
Enter the body weight. Enter the daily exercise. Read off your recommended water, together with approx. glasses (250 ml) — the calculator updates automatically, with no button to press.
Related guides
Daily Water Intake Table: Recommended water by Body weight
Reference table of recommended water for Daily Water Intake across a range of body weight values — exact, engine-computed figures you can read off at a glance.
How to Calculate Daily Water Intake: Formula, Steps & Examples
Learn how to calculate Daily Water Intake — the formula explained step by step, with worked examples and a free calculator to check your answer.