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Measurement of human body weight is an important process in various contexts, such as medical staffing administration, military recruitment, and individual health assessment, as body weight is a key parameter for determining one's body condition. Weight information is traditionally obtained using manual scales, which have been used for many years. However, manual weight measurement is quite time-consuming, especially when done for many people and repeatedly, such as in military recruitment or medical administration. A new approach using digital image technology offers improvements in this process. Therefore, this research aims to calculate human body weight based on digital photos using the Body Surface Area (BSA) method. The use of the BSA method in digital image-based weight measurement involves calculating the body surface area to estimate body mass. This method combines parameters such as height and body circumference taken from the photo image to calculate BSA. Furthermore, an investigation into calculation analysis and accuracy enhancement is conducted. The calculated weight results from the photos are then compared with the scale results to determine their accuracy. Based on the calculation results, an approximate value of 93.3% accuracy is obtained with an average conversion factor of 0.978 at a distance of 300 cm between the camera and the object.

Tempe is the Indonesian people's favorite food. Tempeh, which is liked or commonly consumed, is a type of food made from yellow soybeans. These soybeans are fermented using the mold Rhizopus oligosporus. The results of this fermentation contain protein that is easily digested by the human body, making tempeh a food that is highly recommended for consumption in order to fulfill each individual's nutrition. However, this fermentation process is not so easy, it requires certain conditions. This is something that is often overlooked, so it is necessary to carry out research activities aimed at analyzing the protein content in plastic packaging. This protein content analysis activity uses the biuret method equipped with UV-Vis spectrophotometry with the standard protein solution used is BSA (Bovine Serum Albumin) solution. The measurements carried out provided information on the protein content of tempeh in plastic packaging of 3.739 µg/mL