Short answer
There is no single "correct" weight for an 11-year-old. Weight depends on the child's height, sex, and where they are in their growth. Most healthy 11-year-olds weigh approximately 32–48 kg, but the range is wide. Swedish paediatric healthcare assesses weight using iso-BMI — an age-adjusted BMI measure — and the growth chart over time, not against a fixed number of kilograms.
Why is it not possible to state a single weight?
At 11 years of age, children can be between roughly 132 and 160 cm tall and still be healthy. A weight that is normal for a tall child would be high for a shorter child of the same age. This is why Swedish paediatric healthcare uses BMI charts with age-adjusted cut-offs — not fixed numbers of kilograms.
For many 11-year-olds, puberty begins to affect growth, which further increases the variation in both height and weight. Girls enter puberty on average approximately 2 years before boys.
Approximate weight ranges for healthy 11-year-olds
As a rough reference — not as a target — the majority of healthy Swedish 11-year-olds fall approximately here:
- Height: approximately 138–155 cm
- Weight: approximately 32–48 kg depending on height and growth stage
An 11-year-old child measuring 150 cm and 45 kg can be completely healthy, while a child measuring 135 cm and 45 kg may have obesity. It is iso-BMI and the trend in the chart that healthcare assesses, not a single weight figure.
What does iso-BMI say for an 11-year-old?
Iso-BMI translates the child's BMI into the corresponding adult BMI. The cut-offs follow the International Obesity Task Force (IOTF):
- Iso-BMI 25 = overweight (corresponds to adult BMI 25)
- Iso-BMI 30 = obesity (corresponds to adult BMI 30)
- Iso-BMI 35 and 40 = obesity class 2 and 3
You can calculate iso-BMI with our iso-BMI calculator for children or use the standard BMI calculator for children.
When should guardians seek help?
Contact BVC (child health centre), elevhälsan (school health service), or the vårdcentral (health centre) if:
- The child's BMI chart rises more steeply than before.
- Iso-BMI is 25 or higher (overweight or obesity).
- You notice clear changes in eating or physical activity habits that worry you.
- There is a family history of obesity, type 2 diabetes, or cardiovascular disease.
Elevhälsan routinely measures and weighs children during the school years, and if the chart deviates, the family is contacted for a discussion.
Do not tell the child that they "weigh too much"
It is important never to tell a child that they are "too heavy", "should weigh less", or need to "diet". Research shows that such messages increase the risk of eating disorders and low self-esteem — without helping weight. At 11 years of age, children are also particularly sensitive to comments about their bodies. Treatment of overweight and childhood obesity is directed at the whole family and focuses on routines, the joy of movement, and healthy meals.
Related questions
- What is a normal weight for a 10-year-old child?There is no single 'normal' weight figure — here is how iso-BMI works for a 10-year-old.
- What is a normal weight for a 12-year-old?Puberty, height and sex all play a part — this is how a 12-year-old's weight is assessed.
- What is overweight for a 10-year-old?BMI thresholds for a 10-year-old explained — why iso-BMI is not the same as the adult scale.
Sources
- Folkhälsomyndigheten (Public Health Agency of Sweden) — Measuring overweight and obesity among children
- 1177 Vårdguiden — Obesity and overweight in children
- Rikshandboken i barnhälsovård (National Handbook for Child Health Services) — Increasing BMI, overweight and obesity
- International Obesity Task Force (IOTF) — BMI cut-offs for children
Last updated: June 2026