BMI is a useful screening tool but should not be the only measure of health, since it doesn't distinguish muscle from fat.

What is BMI (Body Mass Index)?

Q: Can athletes have a high BMI?

Yes. Muscle weighs more than fat, so athletes and very muscular people can score in the overweight range while remaining healthy.

BMI is a simple measurement used to estimate whether your weight is healthy for your height. Here's the formula, the category ranges, why it matters, and how to keep yours in a healthy range.

BMI Formula

The formula used to calculate BMI is:

BMI = Weight (kg) / Height² (m²)

Worked Example

For a person weighing 70 kg at 1.75 m tall:
BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.06 = 22.86 — within the normal weight category.

BMI Categories

Below 18.5 – Underweight
18.5–24.9 – Normal weight
25–29.9 – Overweight
30 and above – Obesity

Why BMI Matters — and Its Limitations

Maintaining a healthy BMI is linked to lower risk of heart disease, type 2 diabetes, and high blood pressure. But BMI is only a screening tool: it doesn't measure body fat or muscle mass directly, so athletes and very muscular people are often misclassified as overweight.

How to Maintain a Healthy BMI

Exercise at least 30 minutes most days
Eat more vegetables, fruit, and lean protein
Reduce ultra-processed foods
Drink enough water throughout the day
Sleep 7–8 hours consistently

Consistency matters more than any single change — small sustained habits move BMI in a healthy direction over time.

Check Your BMI Instantly

Skip the manual math — get your BMI and category in seconds.

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Frequently Asked Questions

Is BMI accurate?

BMI is a useful screening tool but should not be the only measure of health.

Can athletes have a high BMI?

Yes. Muscle weighs more than fat, so athletes can have a higher BMI while remaining healthy.

What is a healthy BMI?

For most adults, a BMI between 18.5 and 24.9 is considered a healthy range.

Last Updated: July 2026