Calories Burned Today Calculator View Calculator Find out how many calories you burned today, including calories burned through exercise and activities. First, we'll start with your resting metabolism (RMR or BMR), or how many calories you need each day just to maintain basic bodily functions. We'll get about how many calories you burned today by looking at your lifetyle at work, home, or play and the calories burned during specific exercises and activities you choose. This calculator uses gender, height, weight, and age to determine your RMR, then makes adjustments depending on the lifestyle level you choose, and finally adds in the calories burned doing the selected exercises and activities. Learn more about putting this calculator or other calculators on your website.