Is My Child Overweight? BMI-for-Age Charts for Indian Children Explained
Adult BMI numbers do not apply to children. Indian children are assessed against IAP growth charts using age and sex, and the pattern over time matters more than any single reading.
ALTRcare Medical Team
Clinical Editorial
The short answer: you cannot use adult BMI numbers for a child. A BMI of 22 is unremarkable in an adult and can be firmly in the obesity range for an eight-year-old. Children are assessed with BMI-for-age charts that account for how body composition changes as they grow. In India, the Indian Academy of Pediatrics 2015 growth charts are the standard reference for ages 5 to 18, and WHO standards are used below age 5.
How the Indian charts work
The IAP 2015 charts were built specifically because Indian children develop cardiometabolic problems at lower BMI values than Western reference populations. Rather than using the standard 85th and 95th percentile lines, they plot two special lines: the curve that leads to an adult BMI of 23, used as the overweight cutoff, and the curve leading to an adult BMI of 27, used as the obesity cutoff. Those are the same 23 and 27 thresholds used for Asian Indian adults, projected backwards across childhood.
| Where the child plots | Interpretation |
|---|---|
| Below the 5th percentile line | Underweight, needs assessment |
| Between 5th and the 23 adult equivalent line | Healthy range for age and sex |
| Above the 23 adult equivalent line | Overweight |
| Above the 27 adult equivalent line | Obesity |
Why not just use the adult formula?
Children's body fat percentage changes naturally with age. It falls through early childhood, reaches a low point around age 5 or 6, then rises again through puberty. A fixed number cannot describe that, which is why the assessment is always relative to other children of the same age and sex.
The curve matters more than the point
This is the part most parents miss. A single measurement tells you where a child sits today. A series of measurements tells you which direction they are heading, and that is the more useful information. Children normally track along roughly the same percentile line as they grow. A child who has been steadily on one line for years is usually fine even if that line is on the higher side. A child crossing upward through two or more lines over a year deserves attention even if they are still technically within the healthy band.
Height is half the picture
Growing children have a lever adults do not: they get taller. A child who holds weight steady while gaining height moves down the BMI chart without ever losing a kilogram. This is why paediatricians often aim for weight stability rather than weight loss in younger children, and it is why growth needs to be protected rather than restricted. A weight-loss plan that stalls a child's height is not a success.
Please do not weigh your child daily
Frequent weighing and comments about weight are associated with body image problems and disordered eating in adolescents. Growth monitoring belongs at the paediatrician's clinic, at sensible intervals, not on a bathroom scale at home every morning.
What the doctor will look at besides BMI
- Waist circumference and the pattern of fat distribution, which matter particularly in South Asian children.
- Blood pressure, measured with a correctly sized cuff for the child's arm.
- Skin signs, especially a dark velvety patch at the back of the neck, which suggests insulin resistance.
- Puberty stage, since BMI shifts naturally around the growth spurt.
- Family history of type 2 diabetes, early heart disease or obesity.
- Bloods, when indicated: fasting glucose, HbA1c, lipids and liver enzymes are the usual first set.
What to do with the answer
If your child plots above the overweight line, the next step is a paediatric appointment, not a diet. The clinic visit gives you a plotted growth history, a check for the treatable causes that occasionally sit underneath, and a plan pitched at the household rather than at the child. If your child plots in the healthy range and you were worried, that is worth knowing too, because acting on a wrong assumption has its own costs.
Key takeaways
- Adult BMI cutoffs do not apply to children. Age and sex specific charts are required.
- India uses IAP 2015 charts for ages 5 to 18, with 23 and 27 adult equivalent lines as the cutoffs.
- The direction of the growth curve matters more than a single reading.
- Growing taller can normalise BMI without any weight loss, which is why growth must be protected.
- Take the question to a paediatrician rather than weighing a child at home repeatedly.
Frequently asked questions
What BMI is overweight for a child in India?
There is no single number. Indian children aged 5 to 18 are plotted on IAP 2015 charts, where the overweight cutoff is the curve leading to an adult BMI of 23 and the obesity cutoff is the curve leading to 27, both varying by age and sex.
Can I calculate my child's BMI at home?
You can calculate the number, but interpreting it requires plotting it against age and sex on the correct chart. Bring the height and weight to your paediatrician rather than comparing against adult categories.
Which chart is used for children under five?
WHO growth standards, as recommended by the Indian Academy of Pediatrics. The IAP 2015 charts apply from age 5 to 18.
My child is heavy but very tall. Is that a problem?
Possibly not. BMI accounts for height, and children who are tall for their age may plot in the healthy range despite a high weight. This is exactly why plotting matters more than the raw number.
How often should a child's growth be checked?
Annual measurement at a routine visit is enough for most children, more often if your paediatrician has flagged a concern. Daily or weekly home weighing is not recommended.
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This article is for general educational purposes and is not a substitute for personalised medical advice. GLP-1 medications are prescription-only and not suitable for everyone. Always consult a qualified doctor before starting, changing, or stopping any treatment.
