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Total Daily Water Intake from Weight Calculator

35 mL/kg (sedentary) to 45 mL/kg (active).

Estimates daily total water intake based on body weight and activity level. Uses the general guideline of 35–45 mL/kg/day; outputs in both mL and litres.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Water (mL) = weight_kg × (35 + 10 × (activity_level − 1))

In depth

Estimates daily total water intake based on body weight and activity level. Uses the general guideline of 35–45 mL/kg/day; outputs in both mL and litres.