Normal weight for 12 year olds (kg)

The average weight for 12 year old boys is 40.7 kg and 12 year old girls average 41.8 kg1 The tables below show the distribution of weight by percentile of the 12 year year old population.

Current units = kilograms. View this page in pounds.

12 year old girls under 31 kg or over 56 kg and 12 year old boys who weigh less than 31 kg or more than 54 kg may want to consult with a doctor. The American Academy of Pediatrics recommends that children who's weight is outside the 5th or 85th percentiles seek professional advice to determine if further evaluation is needed2.

As children approach adolescence at the age of 12, they experience growth spurts and various physical changes. The average weight for a 12-year-old typically falls around 41 kg for boys and 42 kg for girls based on CDC growth charts1. During this time, girls may enter puberty earlier than boys, which can lead to differences in weight and height between genders. While it's natural for children to gain weight during growth phases, fostering a supportive and non-judgmental environment can help them develop a healthy relationship with their bodies.

Body weight percentile table for 12 year old boys

Percentile Weight
3rd 29.5 kg
5th 30.6 kg
10th 32.4 kg
25th 35.9 kg
50th 40.7 kg
75th 46.8 kg
90th 54 kg
95th 59.3 kg
97th 63.3 kg

Body weight percentile table for 12 year old girls

Percentile Weight
3rd 30 kg
5th 31.2 kg
10th 33.1 kg
25th 36.7 kg
50th 41.8 kg
75th 48.3 kg
90th 56 kg
95th 61.6 kg
97th 65.9 kg

Source Citations

  1. Robert J. Kuczmarski Dr.P.H. et al., Centers for Disease Control and Prevention, U.S. Department of Health & Human Services 2000 CDC Growth Charts for the United States: Methods and Development
  2. American Academy of Pediatrics Is Your Child Overweight?

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