What is BMI Calculator?

Calculates your body mass index from height and weight and interprets the result clearly.

How do I use BMI Calculator?

Type or paste your data into the field on this page and press the button. The result is calculated instantly in your browser — nothing is uploaded.

Is BMI Calculator free?

Yes, BMI Calculator is completely free. No signup, no downloads and no usage limits.

BMI Calculator

Calculation

Calculate your body mass index from height and weight, see your category and compare ranges on a scale. Free and fully client-side.

Height (cm)

Weight (kg)

You can use a comma or a dot. Values are only processed in this browser.

Enter your height and weight and press Calculate to see the result.

BMI scale

Range	Category
< 18.5	Underweight
18.5 - 25	Normal weight
25 - 30	Overweight
≥ 30	Obesity

Below 18.5 is underweight and above 30 is obese (WHO).

What is a BMI Calculator?

A BMI Calculator computes your body mass index from your height and weight. Enter height in centimeters and weight in kilograms, press Calculate, and the tool divides weight by the square of height in meters, then classifies the result as underweight, normal, overweight or obese.

How is BMI calculated?

BMI is weight (kg) divided by height in meters squared. A 70 kg person of 1.75 m has a BMI of about 22.9, which is a normal range. According to the WHO, below 18.5 is underweight, 18.5–25 normal, 25–30 overweight and above 30 obese.

Color scale and table

Your result is marked on a colored bar that runs from underweight to obese, so you see your category at a glance. The scale table below lists all ranges and categories in detail, highlighting your current one automatically.

How reliable is BMI?

BMI is a practical population indicator but not a medical diagnostic tool. It can mislead in muscular individuals, older adults, children and during pregnancy. Use results for information only and consult a physician for any health concerns.

Is my data safe?

Yes. All calculations run in your browser; your height and weight are never sent or stored. No signup, no install and completely free.

Frequently Asked Questions

What is BMI Calculator?
Calculates your body mass index from height and weight and interprets the result clearly.
How do I use BMI Calculator?
Type or paste your data into the field on this page and press the button. The result is calculated instantly in your browser — nothing is uploaded.
Is BMI Calculator free?
Yes, BMI Calculator is completely free. No signup, no downloads and no usage limits.