BMR Calculator (Basal Metabolic Rate)

About this calculator

Basal Metabolic Rate estimates how many calories a body would burn in a day doing nothing but the essential work of staying alive, such as breathing, circulating blood, and maintaining organ function. The calculation typically draws on established formulas that combine weight, height, age, and sex to approximate this resting energy baseline, since it can't be measured directly without lab equipment.

It's a starting point for anyone building a nutrition or fitness plan, because every other calorie estimate, like how much someone burns with daily activity added on top, builds on this baseline number. People trying to lose, gain, or maintain weight typically calculate it first before layering activity level on top.