Health tool
BMI and TDEE estimator
Enter height, weight, age, and activity level to get your BMI category, estimated basal metabolic rate, and total daily energy expenditure.
Your numbers
What the numbers mean
BMI is weight divided by height squared — a quick screen, not a verdict. Basal metabolic rate (BMR) is the energy your body burns at rest; TDEE scales that by how active you are. Knowing the gap between what you eat and your TDEE is the basis of weight change, up or down.
Frequently asked questions
What is a normal BMI?
Chinese adult standards: under 18.5 underweight, 18.5–23.9 normal, 24–27.9 overweight, 28+ obese. WHO standards: 18.5–24.9 normal, 25–29.9 overweight, 30+ obese. This tool shows both.
Does a normal BMI mean I'm healthy?
Not necessarily. BMI cannot tell muscle from fat or show fat distribution. Athletes can read high, and normal-weight people with belly fat still carry risk — waist size and fitness matter too.
What is TDEE?
TDEE is your total daily energy expenditure — your basal metabolic rate times an activity factor. This tool estimates BMR with the Mifflin-St Jeor equation, a widely used standard.
How much should I eat to lose weight?
A common approach is eating about 300–500 kcal below your estimated expenditure for gradual loss. Avoid eating below your BMR long-term; pregnant or breastfeeding people, teens, and those with chronic conditions should ask a professional first.
How accurate is the estimate?
The formula gives a population average; real expenditure varies with muscle mass, hormones, and daily movement by 10–20%. Treat it as a starting point and calibrate against actual weight trends.