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BMI Calculator for Children

Calculate BMI for children and adolescents. Note that children's BMI should be interpreted using age-specific percentile charts.

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๐Ÿ‡ฉ๐Ÿ‡ฐ All calculations are based on Danish rules, rates, and currency (DKK). This calculator is translated for convenience but applies exclusively to Denmark.

BMI Calculator for Children

BMI for children and adolescents is calculated the same way as for adults โ€” weight divided by height squared โ€” but the interpretation is very different. Because children's body composition changes as they grow, a child's BMI must be compared to age- and sex-specific reference values using percentile charts rather than fixed categories.

Understanding Percentiles

In Denmark, healthcare professionals use growth charts from the Danish Health Authority to assess whether a child's BMI falls within a healthy range. A BMI at the 85th percentile or above for the child's age and sex may indicate overweight, while the 95th percentile or above may indicate obesity. Below the 5th percentile may indicate underweight. This calculator provides the raw BMI value โ€” consult your child's doctor for percentile interpretation.

Healthy Habits for Children

Rather than focusing solely on numbers, encourage children to be physically active for at least 60 minutes per day, eat a varied diet with plenty of fruits and vegetables, and limit sugary drinks and snacks. The Danish dietary guidelines for children emphasise whole grains, fish, and daily outdoor play. If you have concerns about your child's weight, speak with your family doctor or sundhedsplejerske.

Frequently Asked Questions

When are children considered overweight?

Underweight: below 18.5. Normal weight: 18.5-25. Overweight: above 25. Moderate obesity: above 25-30.

How do I know if my child is overweight?

The traditional and most commonly used method in general practice to assess children's overweight is to plot their weight and height on a height/weight curve. With this method, a value above the 97th percentile may indicate overweight, and a value above the 99th percentile may indicate severe overweight.

What is a healthy BMI for children?

A healthy BMI for children depends on age and sex. Unlike adults, where a BMI between 18.5 and 24.9 is considered normal, children's BMI must be read from percentile charts. A BMI between the 5th and 85th percentile for the child's age and sex is considered normal weight.

Should children be put on a diet?

The Danish Health Authority generally does not recommend restrictive diets for children. Instead, the focus should be on healthy eating habits for the whole family, increasing physical activity, and reducing sedentary time. Children need nutrients for growth and development. Always consult a doctor before making significant changes to your child's diet.

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