Health
A daily hydration estimate from body weight, exercise time, and an extra adjustment — a planning figure, not a personal fluid prescription.
Results update as you type. No calculate button. All calculations run locally in your browser.
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| Component | Amount |
|---|---|
| Base (weight × 35 ml) | — |
| Exercise addition (350 ml per 30 min) | — |
| Extra water entered | — |
| Total per day | — |
| Total in litres | — |
| Total in 8 oz cups | — |
Bars are scaled to the total. The extra-water input is included in the total bar but has no separate bar, since it is a free-form adjustment.
Base water = weight (kg) × 35 ml. Add 350 ml per 30 exercise minutes (proportionally for other durations), plus the extra water entered. Total = base + exercise addition + extra.
Weight 65 kg, exercise 30 minutes, extra 0 ml: base = 65 × 35 = 2,275 ml; exercise addition = 350 ml; total = 2,625 ml/day (2.63 litres, about 11.1 cups of 8 oz). Use Reset example above to reproduce this result.
This is a simple rule-of-thumb formula, not a clinical fluid assessment. It does not account for diet (food provides water too), climate, illness, medical conditions, or medications, all of which can change fluid needs in either direction. The extra-water input is a free-form adjustment you control — it is not derived from any condition you enter. The result is a planning figure, not a prescription for how much to drink.
It is the rule-of-thumb coefficient this calculator uses for the base figure. It is a planning convention, not a measured requirement for any individual.
Yes, in reality — food provides a substantial share of daily water. This formula does not split food and drink, so the total is best read as total water from all sources, not a drinking target alone.
Hot weather, high altitude, or any other need you want to add on top of the base and exercise figures. You set it yourself; the page does not derive it.
Possibly. Medical conditions and medications can require more or less fluid, which is why the result is labelled an estimate and clinical advice takes precedence.
No. This calculation runs locally in your browser and the values you enter are not sent to a CalcMintly database.
That is the fixed exercise coefficient used here, applied proportionally: 15 minutes adds 175 ml, 60 minutes adds 700 ml.
Results are estimates only and do not constitute professional or medical advice.