The calories your body burns at total rest — keeping you alive doing nothing. Calculated using the Mifflin-St Jeor formula, the current ACSM-endorsed standard and more accurate than older methods like Harris-Benedict.
Enter your sex, age, weight, and height. BMR returns in calories per day.
This is what's running under the hood. Same formula used by registered dietitians, the ACSM, and most evidence-based nutrition practitioners.
What BMR doesn't include: any movement. Walking, training, fidgeting, digesting food. For total daily calories, you need to multiply BMR by an activity factor — that's what the EER Calculator does.