BMI and Calorie Calculator
Calculate BMI and daily calorie needs.
Input Data
Results
At a glance:Calculate BMI and daily calorie needs.
Formula
BMI (Body Mass Index) = weight (kg) ÷ height (m)².
BMR uses the Mifflin-St Jeor equation: male = 10 × weight + 6.25 × height(cm) − 5 × age + 5; female = same − 161.
TDEE = BMR × activity factor (sedentary 1.2 to extra active 1.9).
Ideal weight reference targets BMI 22: ideal weight = 22 × height(m)².
How to Use
- Enter height and weight; switch between cm / lb units.
- Fill in age and select gender.
- Choose your weekly exercise activity level.
- The calculator instantly shows BMI, BMR, TDEE, and ideal weight.
FAQ
Are Asian BMI standards the same as international ones?
The WHO recommends stricter references for Asians: BMI 18.5–22.9 is normal, 23–24.9 overweight, and 25+ obese. The Hong Kong Department of Health also adopts a similar Asian standard, which differs slightly from Western thresholds (obesity at 30).
How do I use TDEE to manage weight?
To maintain weight, eat about TDEE per day; to lose weight create a calorie deficit (e.g. 500 kcal/day less), and vice versa for gain. Consult a professional for personalized advice.
References
Content reviewed by the Calculatorism editorial team. Results are for reference only; please refer to the relevant authorities for the official figures.