Calculators
Calculators
BMI Calculator
Enter your height and weight to check your Body Mass Index (BMI) and see which weight range you fall into, with the World Health Organization's standard categories shown on a visual scale.
About BMI Calculator
Body Mass Index (BMI) is a number worked out from your weight and height. It is your weight in kilograms divided by your height in metres squared. This calculator does the sum for you. Choose metric (centimetres and kilograms) or imperial (feet and inches, pounds), enter your height and weight, and it shows your BMI, the weight category it falls in, and the weight range that would give a BMI between 18.5 and 24.9 at your height.
The categories are the World Health Organization's ranges for adults: under 18.5 is underweight, 18.5 to 24.9 is normal weight, 25 to 29.9 is overweight, and 30 or more is obese. The formula is the same for men and women, so there is no gender setting.
BMI is a quick screening number, not a diagnosis. It does not measure body fat, muscle, bone or where fat is stored, so it can read high for very muscular people and low for people who have lost muscle. It is meant for adults aged 18 or over and is not used the same way for children and teenagers. If you are worried about your weight or health, talk to a doctor or dietitian.
Who uses it and when
Quick health check
See which general weight range your height and weight fall in.
Set a target range
See the weight range that matches a normal BMI at your height.
Metric or imperial
Enter your numbers in cm and kg, or in feet, inches and pounds.
Track over time
Re-check as your weight changes.
Why use this BMI Calculator
Your BMI and healthy weight range, in your own units.
Metric and imperial
Switch units without doing any conversion yourself.
WHO adult categories
Underweight, normal, overweight and obese on a visual scale.
Weight range for your height
The weights that give a BMI of 18.5 to 24.9.
How it works
Choose your units
Metric (cm, kg) or imperial (ft/in, lb).
Enter height and weight
Use your current measurements.
Click Calculate BMI
Read your BMI, category and healthy range.
Frequently asked questions
How is BMI calculated?
BMI is weight in kilograms divided by height in metres squared. For pounds and inches the tool converts to metric first.
What is a healthy BMI?
For adults, the WHO range for normal weight is 18.5 to 24.9.
Does gender change the result?
No. The same formula and ranges are used for men and women.
Is BMI accurate for athletes?
Not always. It cannot tell muscle from fat, so very muscular people can show a high BMI while being healthy.
Can I use it for children?
No. This calculator is for adults. Children's BMI is compared with age and sex charts, so ask a doctor.
Is my data stored?
No. The calculation runs in your browser.
Related tools
Overview
What Is BMI Calculator?
Calculate Body Mass Index (BMI) to understand your health status.
User Guide
How To Use BMI Calculator
- 1 Open the BMI Calculator interface in your desktop or mobile browser.
- 2 Input or upload your source data, file, or parameters into the designated workspace fields.
- 3 Adjust any optional configuration settings or conversion toggles according to your requirements.
- 4 Click the primary action button to generate your output instantly.
- 5 Copy the resulting text, code snippet, or formatted file directly to your clipboard or local device.
Capabilities
Key Features of BMI Calculator
100% Free & Unlimited Usage
No registration, subscriptions, or hidden limits. Process as many files or items as you need.
Privacy-Focused Processing
All operations execute locally in your client web browser. Your sensitive files and data never touch external servers.
Cross-Platform Compatibility
Fully responsive design optimized for desktop workstations, laptops, tablets, and smartphone displays.
Instant Real-Time Output
Zero server queuing delays. Results are calculated and rendered immediately upon user input.
Client-Side Privacy & Security Guarantee
Your privacy is our priority. BMI Calculator executes processing entirely within your browser environment. Your input data, text, files, and credentials are never transmitted to external servers or stored in remote databases.
FAQ
Frequently Asked Questions
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