BMI Calculator for Teens 12 November, 2024 | Health Calculator Sex Male Female Age (Years) ⚠️Please enter a valid age (10-20 years). Height ⓘEnter your height in your preferred unit m cm ft in ft/in m/cm ⚠️Please enter a valid height. Weight ⓘEnter your weight in your preferred unit kg lbs oz st ⚠️Please enter a valid weight. Calculate Reset BMI: BMI Prime: Percentile: Category: Our Teen BMI Calculator follows CDC/WHO standards.