BMI Calculator: free online, fast and secure
Body Mass Index (BMI) is a quick screening number that compares weight to height. This calculator works in metric (cm, kg) and imperial (feet, inches, pounds) units.
It shows both the international WHO category and the lower Asian-Indian cut-offs that many Indian doctors use, along with the weight range considered healthy for your height.
How to use BMI Calculator
- Choose units. Metric or imperial.
- Enter height and weight. Results update instantly.
- Read your BMI. With WHO and Asian-Indian categories.
Why use ConvertKaro BMI Calculator? Free, fast and secure
Many online tools upload your file to a remote server and make you wait. ConvertKaro is different.
100% Free
Use BMI Calculator completely free, every day. No credit card, no “pro” version and no daily cap on files.
Fast results
No waiting for uploads to finish. The work happens on your device the moment you add a file, which makes it noticeably faster than server-based tools.
Secure and private
Your files never leave your device. ConvertKaro does not upload, store or look at your documents and photos, which makes it safe for ID cards, bank statements and private pictures.
No signup, no watermark
You do not need to sign up or log in, and your output is clean, without any logo or branding.
Works on every device
Nothing to install: it runs in any modern browser on phones, tablets and computers.
Asian-Indian ranges
Shows the lower overweight threshold (BMI 23) used for South Asian adults.
ConvertKaro vs other websites and apps
| ConvertKaro | Typical website or app | |
|---|---|---|
| Price | Free forever, every feature | Free trial, then paid plans |
| Your data | Stay on your device | Uploaded to a server |
| Signup | Not needed | Often required |
| Watermark or ads on result | Never | Common on free plans |
| Speed | Instant, no upload wait | Depends on upload speed |
| Daily limits | None | Usually limited |
Common uses for BMI Calculator
- Personal health tracking
- Fitness and diet planning
- Insurance and medical forms
- School health projects
- Gym onboarding
Tips for the best results
- BMI does not measure muscle or body fat directly.
- Waist size is another useful indicator for Indians.
- Talk to a doctor for health decisions.
- Convert units with the Unit Converter.
Good to know
Calculators are only as good as their inputs. Use the exact rate and tenure from your bank or offer letter, and remember that results are estimates for planning. BMI Calculator does not store your figures, so you can use real numbers privately. For important financial decisions, confirm the final values with your bank, accountant or financial advisor.
| Price | Free, no limits |
|---|---|
| Processing | In your browser, instant |
| Signup | Not required |
| Watermark | None |
| Works on | Android, iPhone, Windows, Mac, Linux |
| Category | Calculator tools |
How BMI Calculator keeps your numbers private
Everything you enter into BMI Calculator stays on your device. The tool works offline once the page has loaded, because all the logic is in the page itself rather than on a server. We never receive, log or store your numbers, so you can use it at work, at school or for personal matters without worrying about privacy.
Using BMI Calculator on your phone
On a phone, open this page in Chrome or Safari, tap the main button and pick or paste what you need. Results download straight to your phone, usually into the Downloads folder or Files app. You can also add this page to your home screen for one-tap access next time.
Who uses BMI Calculator?
You do not need any technical knowledge to use it. It is popular with:
- Salaried people planning loans, savings and investments
- Shop owners and freelancers calculating GST and discounts
- Students solving maths and finance problems
- Families planning budgets and big purchases
- Anyone who wants a quick, accurate answer without a spreadsheet
Supported input: Indian number format (lakh and crore) with ₹ amounts, and standard units.
Frequently asked questions
What is a healthy BMI?
18.5–24.9 by WHO; many Indian guidelines consider 18.5–22.9 normal.
Why are Asian-Indian cut-offs lower?
Studies show South Asians face higher health risks at lower BMI levels.
Is my data stored?
No. Nothing is saved or sent.
Is BMI Calculator really free?
Yes, completely free. You can use it as many times as you want, and every option on the page is included at no cost.
Is it safe to use BMI Calculator online?
Yes. Your data are processed inside your own browser and are never uploaded to our servers, so nobody else can see them.
Does BMI Calculator work on mobile?
Yes, the tool is built mobile-first. Open this page on your phone, add your data and download the result directly.
Do I need to install anything to use BMI Calculator?
No. BMI Calculator works in your web browser. There is no app, plug-in or extension to install.
Will ConvertKaro add a watermark or ask me to sign up?
No. There is no watermark, no login and no email required. Copy or download the result as it is.
Does BMI Calculator work offline?
Once this page has finished loading, the tool keeps working even if your internet connection drops, because all processing happens on your device.
Related free tools
Explore more free tools that work the same way, privately in your browser: Age Calculator, Unit Converter, Percentage Calculator, Date Difference Calculator, Discount Calculator.