BMR explained
Basal metabolic rate is an estimate of energy used at rest. Equations use variables such as age, sex, height and weight, so they cannot capture every individual difference.
TDEE explained
Total daily energy expenditure adds an activity estimate to resting needs. Activity multipliers are broad categories, so your true needs may differ from the first estimate.
Understanding calorie needs
Energy needs can vary with body size, movement, training, illness, pregnancy and other factors. Compare calculator estimates with longer-term trends rather than reacting to one day.
Activity levels explained
Choose the activity level that best represents your usual week. Avoid increasing the activity multiplier simply to produce a preferred calorie target.
Important: Health calculators and measurements provide estimates or screening context. They do not diagnose disease or replace individualized medical advice.