Body Surface Area Calculator Online

Your measurements

Choose your units, then enter the details you want to use.

Complete the relevant fields and select Calculate. Changes to your inputs clear the previous result.

Educational estimates, with their equations and assumptions. They do not diagnose a condition or prescribe a treatment.

Adults aged 20 or older; educational body-size estimate.

Mosteller BSA(m²) = √(height(cm) × weight(kg) ÷ 3600). Du Bois & Du Bois BSA(m²) = 0.007184 × height(cm)^0.725 × weight(kg)^0.425.

This tool must not be used to select medication, chemotherapy or fluid doses.
Historical equations can disagree at extremes of body size and do not directly measure skin area.