CalcHealth
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Maintenance Fluid Calculator

Estimate daily maintenance fluids using the Holliday-Segar method.

For the interactive calculator, open the full CalcHealth page.

Open Full Calculator

Frequently Asked Questions

What is the 100-50-20 rule?

It estimates 100 ml/kg for the first 10 kg, 50 ml/kg for the next 10 kg, and 20 ml/kg after that.