This body surface area calculator helps you calculate how much surface area of the skin is affected by a disease. By using the handprint- or palm-method you simply estimate the area affected by following these steps:

1. Take the patients palm for reference

2. Estimate how many patient palms fit in the affected area of the head.

(Hint: there are no more than 10 palms on the head alone)

(Hint: there are no more than 10 palms on the head alone)

3. Repeat the same for the arms, trunk and legs.

4. Type the results in palms into the calculator

--> you will see the total Body surface area affected and the surface area affected for each part of the body.

**Use the calculator below to get started**