Girls BMI chart in cms and kgs for Children 8 years & 1 month old

BMI chart for 8 Years 1 Months girls

Reading the BMI chart for girls: categories and context at 8 Years 1 Months.

BMI percentiles for 8 Years 1 Months girls

The BMI distribution for girls at 8 Years 1 Months, based on CDC growth standards:

• 5th percentile (underweight threshold): 13.5

• 25th percentile: 14.7

• 50th percentile (median): 15.8

• 75th percentile: 17.3

• 85th percentile (overweight threshold): 18.3

• 95th percentile (obesity threshold): 20.7

The percentile values on this page are displayed in cm and kg.

The CDC classifies BMI-for-age percentiles for girls as follows: underweight below the 5th percentile, healthy weight between the 5th and 85th percentiles, overweight between the 85th and 95th percentiles, and obese above the 95th percentile.

Growth percentiles place your child's measurement on a scale from 1 to 99 relative to girls. The 50th percentile represents the middle of the typical range.

What to expect at 8 Years 1 Months

At 8 years, BMI begins to reflect early puberty effects for some children. Girls often begin puberty between ages 8 and 13, and boys between 9 and 14. A rise in BMI that precedes the pubertal growth spurt is normal and does not indicate unhealthy weight gain. The CDC BMI-for-age chart accounts for age and sex differences, making it the appropriate tool for assessing weight status in children.

What the healthy BMI range means

A healthy BMI for school-age children falls between the 5th and 85th percentile on the CDC BMI-for-age chart. Unlike adults, where a fixed range is used, children's healthy BMI values change with age and sex - which is why the age-specific percentile chart is essential.

Healthy lifestyle habits for school-age children

At least 60 minutes of moderate to vigorous physical activity daily, nine to eleven hours of sleep, regular family meals, and limited ultra-processed food intake are the most evidence-based supports for healthy BMI. Small, consistent habits over years matter far more than any short-term intervention.

Communicating about weight with children

BMI-for-age should not be discussed directly with children in terms of fat or weight. If a healthcare review reveals a concern, framing any lifestyle changes in terms of energy, strength, and overall wellbeing is more effective and less likely to contribute to body image concerns or disordered eating in later adolescence.

Frequently asked questions

How is BMI calculated for children?

BMI is calculated using the same formula as for adults: weight (kg) divided by height (m) squared. However, for children and teenagers, the resulting number is not interpreted using adult categories. Instead, it is plotted on a sex- and age-specific percentile chart, because normal BMI values vary significantly with age during childhood and puberty.

Is a high BMI percentile always a problem for a child?

Not necessarily. A single BMI percentile reading above the 85th threshold should trigger further assessment, not alarm. Clinical evaluation considers the full growth history, body composition, diet, activity levels, and family history. Many children who screen in the overweight range on BMI have normal fat levels when properly assessed. A GP or paediatric dietitian can provide appropriate context.

What BMI percentile is considered healthy for children?

For children and teenagers, the healthy BMI range is between the 5th and 85th percentile on the CDC BMI-for-age chart. Below the 5th percentile is classified as underweight; between the 85th and 95th percentile is overweight; above the 95th percentile is obese. These classifications are screening categories used to guide further assessment, not diagnoses in themselves.

Data sources and methodology

The percentile ranges on this page are drawn from CDC growth chart data from the National Center for Health Statistics and WHO Child Growth Standards (for children under 5). CDC data published May 30, 2000, with 2022 extended BMI tables. Percentiles are modelled using the LMS method (Box-Cox transformation), which accounts for the skewed distribution of measurements at each age. All measurements are given in metric units with imperial equivalents.

Individual variation is normal and expected. A healthcare provider can help interpret these measurements in context with overall health and development.