Use this calculator for a general daily water target. It is a planning aid, not a medical hydration prescription.
Inputs
The strongest pages in the library pair the live calculator with a topic guide and, where it helps, a printable reference you can reuse offline.
Use this page as a simple hydration-planning tool when you want a rough daily intake target based on weight, exercise time, and climate conditions.
The main result is the estimated daily intake target in litres. Supporting values convert that figure into millilitres and cups for easier day-to-day use.
A heavier person, a longer workout, or hotter conditions all increase the estimate because the calculator adds those factors directly to the base hydration target.
Hydration needs vary with health conditions, medication, diet, and environment. This result is a general estimate, not medical advice.
No. Daily water needs vary considerably from person to person, so use the result as a planning guide and adjust for your own context or professional advice.
Warmer conditions often increase fluid needs, so the calculator adds a simple climate adjustment rather than assuming the same intake suits every environment.
Estimate basal metabolic rate from age, sex, height, and weight using the Mifflin-St Jeor equation with neutral, non-clinical presentation.
Use the Calorie Burn Calculator as a general planning estimate with clear assumptions and careful interpretation.
Estimate a target training heart-rate range from age and chosen intensity percentages using a standard rule-of-thumb formula.
Calculate pace per kilometre or mile from the distance and finish time you enter, with clean support for running and walking scenarios.