BMR Calculator
Basal metabolic rate estimates using common prediction equations.
Guide: BMR Calculator
Basal Metabolic Rate (BMR) estimates calories burned at rest. Common equations include Mifflin-St Jeor and Harris-Benedict. Use results to start a conversation about intake targets, not as a medical prescription. BMR rises with lean mass and typically falls slowly with age if muscle is not maintained, which is why strength training pairs well with long-term metabolic health.
BMR vs TDEE
BMR is rest only; TDEE multiplies BMR by an activity factor. For weight change planning, TDEE is usually the more relevant anchor.
Sedentary multipliers are surprisingly close to BMR for small people with desk jobs; highly active roles widen the gap dramatically.
Equation choice
Mifflin-St Jeor is widely cited in modern apps for adults. Harris-Benedict is older; revised versions exist.
If your on-page tool exposes the equation, stick with one for a month before switching, so adjustments are comparable.
Medical contexts
Critical illness, thyroid disorders, and certain medications alter resting expenditure. Self-calculated BMR should not override clinical nutrition plans.