1
Patient Weight
kg
Local anaesthetic doses should be calculated on lean / ideal body weight in obese patients to avoid over-dosing — total body weight overestimates lean tissue volume and risks systemic toxicity.
2
Local Anaesthetic & Concentration
Conversion: 1% solution = 10 mg/mL.
When two LAs are mixed, their toxicities are additive — each drug's safe maximum is reduced to 50%.
Enter patient weight and concentration above to see the maximum permissible dose and volume.
Clinical Disclaimer: Maximum-dose figures vary between guidelines and product labels.
The values used here are pure weight-based maxima (mg/kg × kg) and represent an upper limit — not a target.
Always reduce doses for the elderly, in pregnancy, in cardiac/hepatic impairment, with concurrent local anaesthetic use,
and in head-and-neck or highly vascular blocks. Aspirate before injection and use incremental dosing. The developer accepts
no liability for clinical decisions made using this tool.