Calculate your BMI: when is it time to take action?

What is BMI?

BMI stands for Body Mass Index — a simple calculation that relates your weight to your height. The formula:

BMI = weight (kg) / (height (m) x height (m))

For example: 90 kg at 1.75 m = 90 / (1.75 x 1.75) = 29.4

BMI categories

When is action needed?

BMI isn't perfect — it doesn't account for muscle mass, bone density or fat distribution. But it provides a useful initial indication.

BMI 25-29.9 (overweight)

At this level, lifestyle adjustments can often be enough: more exercise, healthier eating, better sleep. A dietitian can help.

BMI 30+ (obesity)

At a BMI of 30 or above, a personalised weight management programme may be worthwhile. This is the point where medically supervised support becomes more effective than dieting alone.

What are your options at BMI 30+?

Lifestyle

Nutrition, exercise and behavioural change remain the foundation. But at a BMI of 30+, this is often not enough on its own.

Branded products

There are registered branded products available through your GP. Cost: €300-400 per month. Often a standard dosage that isn't tailored to your body.

Compounding via Magistra

A personalised programme through a licensed compounding pharmacy. The dosage is tailored to your BMI, health and goals. Cost: from €155 per month.

How does BMI calculation work at Magistra?

When you complete the Magistra questionnaire, we automatically calculate your BMI based on your height and weight. This helps the doctor assess whether a personalised programme is suitable for you.

Your BMI is only shared with the doctor who assesses your profile — never with third parties.

Calculate your BMI and get started: magistra.health/nl/patient/start

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