Teen BMI calculator

Teen BMI Calculator

Real-time BMI, BMI Prime, CDC BMI-for-age percentile (2–20y), and teen category. Fully responsive, Elementor-safe.

Inputs

📏 Height ?

⚖️ Weight ?

🎂 Age ?

🚻 Sex ?

Live Results

BMI (kg/m²)

BMI Prime

Percentile

Teen Category

Step-by-Step Derivation


1) Convert inputs to SI units:
   height_m = —
   weight_kg = —
2) BMI = weight_kg / (height_m²) = —
3) BMI Prime = BMI / 25 = —
4) If age+sex provided:
   • Find CDC L, M, S for BMI-for-age at your age (months), interpolate if needed.
   • z = ((BMI/M)^L - 1) / (L*S)
   • percentile = Φ(z) × 100
5) Teen category (CDC): 
   Underweight < 5th; Healthy 5th–<85th; Overweight 85th–<95th; Obesity ≥95th.

Quick Summary

Enter height & weight (plus age & sex for teen percentile). Your results will appear here.

Sources

• CDC Growth Charts Data Files (L-M-S & percentiles, BMI-for-age 2–20 years).
• CDC: Calculating BMI & U.S./metric formulas.
• CDC: Child & Teen BMI Categories (percentile cut-points).