Calculating your recommended water is straightforward once you know the Daily Water Intake formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the Daily Water Intake Calculator.
What is Daily Water Intake?
The Daily Water Intake calculation tells you your recommended water from a few simple inputs. The figure you are solving for here is the recommended water.
The Daily Water Intake formula
The core formula is:
Recommended water = Body weight × 0.033 + Daily exercise ÷ 30 × 0.35Here is what each input means:
- Body weight — a value measured in kg. Example: 70 kg.
- Daily exercise — a value measured in minutes. Example: 30 minutes.
How to calculate it step by step
- Write down the body weight (for example, 70 kg).
- Write down the daily exercise (for example, 30 minutes).
- Apply the formula above to get your recommended water.
- Double-check the result with the Daily Water Intake Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Body weight | 70 kg |
| Daily exercise | 30 minutes |
| Recommended water | 2.66 |
| Approx. glasses (250 ml) | 11 |
With body weight of 70 kg and daily exercise of 30 minutes, the recommended water works out to 2.66.
Example 2
With body weight of 140 kg and daily exercise of 30 minutes, the recommended water works out to 4.97.
| Result | Value |
|---|---|
| Recommended water | 4.97 |
| Approx. glasses (250 ml) | 20 |
Example 3
With body weight of 35 kg and daily exercise of 30 minutes, the recommended water works out to 1.51.
| Result | Value |
|---|---|
| Recommended water | 1.51 |
| Approx. glasses (250 ml) | 6 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
- These figures are general estimates, not medical advice — check with a qualified professional before acting on them.
Prefer not to do the maths by hand? — the Daily Water Intake Calculator does it instantly, for free, with the formula and a worked example built in.
Related calculators
Continue exploring health calculators with these tools: BMI Calculator, Corrected Calcium Calculator, Anion Gap Calculator, QTc Calculator (Bazett), Maintenance Fluid Calculator (4-2-1 Rule).