BMI Calculator for Kids – Is Your Child’s Weight Healthy?
This BMI Calculator for Kids helps you determine whether your child is growing at a healthy weight based on their age, height, and weight.
It uses WHO growth charts and BMI-for-age percentiles — the official method used in schools, clinics, and pediatric guidelines.
This calculator uses WHO growth charts and BMI-for-age percentiles — as recommended by CDC and pediatric guidelines.
How to Use the Child BMI Calculator
- Enter your child’s Age
- Enter Gender
- Input Height (cm or ft/in)
- Enter Weight (kg or lbs)
- Click Calculate
👉 You’ll get:
- 📊 BMI score
- 🎯 BMI percentile
- 📘 Category: Underweight / Normal / Overweight / Obese
- 🧸 Age-specific advice
👉 Use the Kids BMI Calculator Now
Why Children Need a Different BMI System
Unlike adults, kids are still growing, so we don’t use a fixed BMI range.
Instead, BMI is compared to others of the same age and gender, using percentiles.
BMI percentiles compare your child’s BMI to a large group of children of the same age and gender. For example, the 85th percentile means the child weighs more than 85% of peers:
| Percentile Range | Category |
|---|---|
| Below 5th | Underweight |
| 5th – 85th | Normal weight |
| 85th – 95th | Overweight |
| Above 95th | Obese |
Example Result
Age: 10 years, Gender: Male
Height: 140 cm, Weight: 45 kg
✅ BMI: 22.9 → 91st percentile → Overweight
💡 Advice: “Encourage active play, check diet quality, and consult pediatrician if needed.”
Who Should Use This Calculator?
This tool is not a diagnosis but a helpful screening aid based on globally accepted guidelines
- 👨👩👧 Parents
- 🏫 Teachers / School health teams
- 👩⚕️ Pediatricians & dietitians
- 📋 Child welfare programs
- 🍼 Public health screenings
How to Improve BMI in Kids
- 🍎 Focus on whole foods & portion sizes
- 🏃 Encourage daily physical activity
- 📉 Avoid crash diets — focus on healthy habits
- ⏰ Growth takes time — be patient and supportive