How much potassium to give per mEq/L deficit?

Each 0.1 mEq/L drop in serum K below 4.0 represents approximately 100-200 mEq total body deficit. This is an estimate — actual deficit varies widely.

How fast can IV potassium be given?

Maximum peripheral IV rate: 10 mEq/h. Via central line: up to 20-40 mEq/h with continuous cardiac monitoring. Standard replacement: 10-20 mEq/h.

Why is magnesium important in hypokalemia treatment?

Hypomagnesemia causes refractory hypokalemia by impairing renal potassium conservation. Always replace magnesium alongside potassium when both are low.

Potassium Deficit Calculator

Estimate total body potassium deficit from serum K+ — guides KCl replacement dosing and rate.

Use the full interactive calculator below, or

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Frequently Asked Questions

How much potassium to give per mEq/L deficit?

How fast can IV potassium be given?

Why is magnesium important in hypokalemia treatment?