Your Measurements
How BMI and BMR work
Professional BMI + BMR/TDEE Calculator: Know Your Numbers
Your weight alone does not tell the full story. Our BMI + BMR/TDEE calculator online free combines three essential health metrics in one private workspace: Body Mass Index (BMI) for weight screening, Basal Metabolic Rate (BMR) via the Mifflin-St Jeor equation, and Total Daily Energy Expenditure (TDEE) based on your activity level.
How the math works
BMI = weight (kg) / height (m)^2. Categories: Underweight < 18.5, Healthy 18.5–24.9, Overweight 25–29.9, Obese ≥ 30. BMR (Mifflin-St Jeor): men 10×kg + 6.25×cm − 5×age + 5; women the same − 161. TDEE = BMR × activity factor (1.2–1.9).
How to use it
- Track bulk/cut goals: compare TDEE against intake for a 300–500 kcal deficit or surplus.
- Check healthy range: we show the 18.5–24.9 weight band for your height.
- Private by design: all calculations run locally in your browser.
Use ToolStacker's BMI calculator with BMR to plan calories with confidence — then confirm goals with a professional.
Common questions
What is a healthy BMI?
WHO defines 18.5-24.9 as healthy, below 18.5 underweight, 25-29.9 overweight, 30+ obese.
What is BMR vs TDEE?
BMR (Mifflin-St Jeor) is resting calorie burn; TDEE multiplies BMR by activity (1.2-1.9) for daily needs.
Is my health data uploaded?
No. All calculations run locally in your browser.
BMI Calculator
Calculate BMI, BMR (Mifflin-St Jeor) and TDEE instantly. Check healthy weight range, BMI Prime and daily calorie needs in your browser.
Metric
BMI + BMR
Method
Mifflin-St Jeor
Output
TDEE Estimate