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Daily Fluid Needs by Weight Calculator

Maintenance fluid volume per body weight.

Compute a healthy adult's daily maintenance fluid requirement using the 30–35 mL/kg rule of thumb. Reports total mL, fluid ounces, and approximate 8-ounce cups.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

kg

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

Daily mL = weight_kg · mL_per_kg.

In depth

Compute a healthy adult's daily maintenance fluid requirement using the 30–35 mL/kg rule of thumb. Reports total mL, fluid ounces, and approximate 8-ounce cups.