health

Child BMI Calculator

Q: Is child BMI the same as adult BMI?

No. Child BMI must be interpreted with age- and sex-specific percentile curves: the 85th-95th percentile is overweight, 95th+ is obese.

Q: Should an overweight child go on a diet?

Children should not diet. Manage weight-gain speed with more activity, less sugary food, and enough sleep so height catches up with weight.

Q: How do I use the BMI Calculator?

Open the page and fill in the input fields — results update automatically. Body mass index with healthy range by standard.

Q: Are the results accurate?

Results follow published international standards (WHO, ACE, IOM) and are for reference only.

Q: Can this replace medical advice?

No. Always consult a qualified healthcare professional for health decisions.

BMI calculator for children and teens using age- and sex-specific percentiles — assess whether a child's weight is healthy, overweight or at obesity risk.

Free online · Instant results

Height (cm)

Weight (kg)

BMI

22.5

NormalChina std

China BMI bands (18.5/24/28)

Under

Normal

Overweight

Obese

Healthy weight range for your height: 53.5–69.4 kg

Healthy range53.5~69.4 kg

To normal edge0 kg

Ponderal Index13.2

BMI Prime0.94

Reverse: target BMI → target weight

Target BMI

Target weight

63.6 kg

lose 1.4 kg

Steps

1BMI = weight ÷ height² = 65.0 ÷ 1.700² = 65.0 ÷ 2.8900 = 22.49
2China bands: under <18.5, normal 18.5–23.9, overweight 24–27.9, obese ≥28 → you are "Normal"

BMI bands: China vs WHO

Band	China (WS/T 428)	WHO	Risk
Underweight	<18.5	<18.5	Low (but nutritional risk)
Normal	18.5–23.9	18.5–24.9	Lowest
Overweight	24.0–27.9	25.0–29.9	Elevated
Obese	≥28.0	≥30.0	High (diabetes/CVD)

💡 BMI applies to adults 18+. It misclassifies muscular athletes (high muscle = high "overweight") and the elderly (muscle loss hides fat). China uses stricter cutoffs (24/28 vs 25/30) because Asians develop metabolic risk at lower BMI. Ponderal Index (kg/m³) is fairer for very tall/short people. Not for children — use growth percentile charts instead.

Frequently Asked Questions

Is child BMI the same as adult BMI?▼

No. Child BMI must be interpreted with age- and sex-specific percentile curves: the 85th-95th percentile is overweight, 95th+ is obese.

Should an overweight child go on a diet?▼

Children should not diet. Manage weight-gain speed with more activity, less sugary food, and enough sleep so height catches up with weight.

How do I use the BMI Calculator?▼

Open the page and fill in the input fields — results update automatically. Body mass index with healthy range by standard.

Are the results accurate?▼

Results follow published international standards (WHO, ACE, IOM) and are for reference only.

Can this replace medical advice?▼

No. Always consult a qualified healthcare professional for health decisions.

💡

This is a dedicated variant of the BMI Calculator, pre-configured for this scenario with tailored FAQs.