Have you ever thought about how much energy your brain uses every day? On its own, the brain accounts for 20% of your bodies calorie usage. ‘Brain Power’ is a browser extension that aims to visualise the amount of energy used by the brain based on the time spent in one’s browser window. Furthermore, it compares this data to the energy consumption of objects and appliances from our surroundings to make it more understandable. The data was selected from a list of activities for a 155lb person. The prototype was made using HTML/CSS.