A method for measuring the absorption of fluid in an absorbent product includes at least the following steps performed by a mobile device having an image capturing device: capturing at least one image of a used absorbent product; determining a measure of absorption of fluid by the product based on image information in the captured image; and displaying information relating to the use of the absorbent product based the measure of absorption of fluid on the mobile device. The method can aid a user of absorbent product to choose the right type of product for the user's individual needs.