Body Mass Index Calculator

Check your BMI in seconds using height and weight in metric or imperial units.

Calculator

Enter your details to get a quick BMI check-in.

Units Weight

Height

Your result

Ready when you are Healthy range 18.5 - 24.9

BMI score

Enter your details

We will show your score after you calculate.

BMI is one small health signal. Use it as a quick check-in, not as a judgement about your body or wellbeing.

Formula

kg / m²

Keep in mind

A quick guide, not a diagnosis.

Quick notes

Use metric or imperial units and switch at any time without losing your place.

Your BMI appears instantly once you calculate, along with a simple adult range guide.

BMI is a screening tool. It does not replace medical advice or a full view of your health.

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Send it to someone who needs a quick BMI check, or save the link for later.

About the tool

What this calculator helps with

What is BMI?

Body Mass Index is a quick screening measurement that compares your weight to your height. It is commonly used to estimate whether your weight falls into a lower, typical, higher, or obesity-range category for adults.

When is it useful?

BMI is useful for a quick first look at weight range, especially when you want a simple check without needing detailed body measurements.

What should you keep in mind?

BMI is only a general screening tool. It does not directly measure body fat, muscle mass, age, sex, or medical history, so it should not be treated as a full health assessment on its own.

How it works

How the result is calculated

• Choose your preferred unit system: metric or imperial.
• Enter your height and weight in the fields provided.
• The calculator converts the values if needed and applies the BMI formula.
• You get an instant BMI score and a matching adult BMI category.

FAQs

Common questions

What is the BMI formula?

For metric units, BMI is weight in kilograms divided by height in meters squared. For imperial units, BMI is weight in pounds multiplied by 703, divided by height in inches squared.

Is BMI accurate for everyone?

BMI is best used as a broad screening tool. It can be less representative for people with high muscle mass, certain body compositions, or specific medical contexts.

Can I use this for children?

This version is intended for general adult BMI guidance. BMI for children and teens is interpreted differently and should use age- and sex-specific guidance.