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Cefalexin Dose Calculator

Weight (kg)

Choose Indication

General dosing (12.5mg/kg)

UTI (25mg/kg)

Choose Cefalexin Strength

Cefalexin 125 mg/5 mL

Cefalexin 250 mg/5 mL

Dose in millilitres

Dose in milligrams

For ages 1 month to 18 years only.

This calculator uses 12.5mg/kg/dose (General) or 25mg/kg/dose (UTI)

General Dosing:

1 month - 18 years 12.5–25 mg/kg (usual maximum 500 mg; up to 1 g may be used), TWICE daily for impetigo and FOUR times daily for infections due to sensitive Gram-positive and Gram-negative bacteria.
Note High doses (25 mg/kg) are used in secondary care situations (e.g. step-down dosing for bone/joint infections).

UTI Dosing:

1 month - 18 years 25 mg/kg (maximum 500mg) THREE times daily.

Calculator written by Dr Jeremy Steinberg, GP. Contact for suggestions