BMI Calculator

Calculate your Body Mass Index instantly

See your weight category and healthy range

Privacy Notice:

All calculations are performed locally in your browser. No data is stored or uploaded.

BMI Calculator

BMI Formula: weight(kg) / height(m)2

Your BMI Result

24.2
Normal
24.2
018.5253040+
Underweight
Normal
Overweight
Obese

Healthy Weight Range

Based on your height, a healthy weight would be:

53.5 - 72.2 kg

(117.9 - 159.2 lbs)

Health Tips

Great job! Maintain your healthy lifestyle with balanced nutrition and regular physical activity.

What is BMI?

Body Mass Index (BMI) is a simple calculation using height and weight to estimate body fat. The formula is weight in kilograms divided by height in metres squared (kg/m²), or 703 × pounds ÷ inches² in imperial units. Adult BMI categories are: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25–29.9) and obese (30 or above). Because BMI does not distinguish muscle from fat, treat it as a quick screening number rather than a diagnosis.

How to Calculate BMI

1

Select units

Choose your preferred units (metric or imperial)

2

Enter weight

Input your weight in kg or pounds

3

Enter height

Input your height in cm or feet/inches

4

View results

See your BMI and weight category instantly

Why Use Our BMI Calculator?

Dual unit support

Works with both metric and imperial units

Healthy weight range

Shows your ideal weight range based on height

Visual scale

Interactive BMI scale shows where you fall

100% Private

All calculations happen in your browser

Frequently Asked Questions

BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated as weight (kg) divided by height (m) squared.
Divide your weight in kilograms by your height in metres squared: BMI = kg / m². For example, 70 kg at 1.75 m gives 70 / (1.75 × 1.75) = 22.9. In imperial units, use BMI = 703 × weight (lbs) / height (in)².
Convert your height from centimetres to metres (divide by 100), square it, then divide your weight in kg by that number. A person who is 165 cm and 60 kg has a BMI of 60 / (1.65 × 1.65) = 22.0.
A healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is considered obese.
The WHO suggests lower cut-offs for many Asian populations because health risks rise at a lower BMI. A BMI of 23 or above is often treated as overweight and 27.5 or above as obese.
BMI is a general screening indicator. It may not be accurate for athletes, older adults, pregnant women, or people with high muscle mass, because it does not distinguish muscle from fat. Consult a doctor for personalized advice.

Related Health Tools

Explore more tools in this category

Age Calculator

Calculate exact age in years, months, and days. See total days, weeks, and next birthday countdown.

agecalculatorbirthday
Explore all health tools