Calculator Tool

BMI Calculator
Calculate Your Body Mass Index Instantly

Calculate your Body Mass Index instantly using your height and weight. Supports both metric and imperial units, with your weight category and a healthy weight range.

Calculate BMI

Enter your height and weight to get your instant Body Mass Index result

--
Your BMI
--
Height
--
Weight
--
Healthy Weight Min
--
Healthy Weight Max
⚖️ Weight Category
--
based on your BMI value
Summary: --

How to Use the BMI Calculator

Get your Body Mass Index in 4 simple steps

1
Select Your Unit System

Choose metric (kilograms and centimeters) or imperial (pounds, feet and inches) based on your preference.

2
Enter Your Height

Type your height in the selected unit — centimeters for metric, or feet and inches for imperial.

3
Enter Your Weight

Type your current weight in kilograms (metric) or pounds (imperial).

4
Click Calculate BMI

Instantly see your BMI value, weight category, and a healthy weight range for your height.

Why Use This BMI Calculator?

A quick, reliable screening tool for general health awareness

  • Metric & imperial support: Switch seamlessly between kg/cm and lb/ft-in units.
  • Standard WHO formula: Uses the internationally recognized BMI formula for consistent results.
  • Healthy weight range: See the minimum and maximum weight considered healthy for your exact height.
  • Clear category labels: Instantly know whether you fall under underweight, normal, overweight or obese.
  • No account needed: Use instantly, no login or registration required ever.

BMI Categories Chart

Standard WHO BMI classification for adults

BMI Range Category General Health Note
Below 18.5 Underweight May indicate insufficient nutrition; consult a healthcare provider
18.5 – 24.9 Normal weight Generally considered a healthy weight range for most adults
25.0 – 29.9 Overweight Increased risk for certain health conditions; lifestyle review advised
30.0 – 34.9 Obese (Class I) Higher health risk; professional guidance recommended
35.0 and above Obese (Class II & III) Significant health risk; medical consultation strongly advised

BMI is a general screening tool and does not account for muscle mass, bone density, age, sex, or ethnicity. Always consult a healthcare professional for a complete health assessment.

Key Benefits

Why people use our BMI calculator daily

Instant Calculation

Get your BMI result the moment you click calculate — no waiting, no loading delays.

WHO Standard Formula

Uses the globally accepted BMI formula so your result matches medical references.

Works on All Devices

Fully responsive design works perfectly on smartphones, tablets, laptops, and desktop computers.

Private & Secure

All calculations happen in your browser. No data is sent to or stored on our servers. Ever.

Metric & Imperial Ready

Switch units instantly without manual conversion — works for users worldwide.

Healthy Range Guidance

Get a healthy weight range for your height, not just a single BMI number.

Frequently Asked Questions

Everything you need to know about BMI calculation

BMI is calculated by dividing weight in kilograms by the square of height in meters: BMI = weight (kg) / [height (m)]². For imperial units, BMI = 703 × weight (lb) / [height (in)]².

According to WHO classification, a BMI between 18.5 and 24.9 is generally considered a healthy weight range for most adults. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is classified as obese.

BMI is a useful general screening tool but does not directly measure body fat or account for muscle mass, bone density, age, or sex. Athletes and very muscular individuals may have a high BMI without excess body fat, so BMI should be considered alongside other health indicators.

Yes. BMI for children and teens is calculated the same way but is interpreted using age- and sex-specific percentile charts rather than the fixed adult categories, since healthy body composition changes during growth.

No. The BMI calculator runs entirely in your browser using JavaScript. No data is sent to our servers, and nothing is stored, logged, or tracked. Your privacy is completely protected.

Yes. You can switch between metric (kilograms and centimeters) and imperial (pounds, feet and inches) units, and the calculator automatically applies the correct formula for the selected unit system.