Free BMI Calculator Online
Calculate Body Mass Index with metric or imperial units. Free, fast, and works entirely in your browser with no sign-up required.
BMI Calculator
Comprehensive BMI calculator with metric/imperial units, color-coded categories, body fat estimation (Deurenberg), ideal weight (Devine/Robinson/Miller/Hamwi), waist-to-height ratio, BMI chart, goal calculator, history tracking, and CSV export.
Your Measurements
Your BMI Result
Body Mass Index
24.2
Normal
BMI Prime
0.97
Optimal (< 1.0)
ratio to upper-normal BMI (25)
Ponderal Index
14.2
kg/m³ — healthy: 11-15
Healthy range
BMI Scale
Severely Under
< 16
Mod. Under
16-16.9
Mildly Under
17-18.4
Normal
18.5-24.9
Overweight
25-29.9
Obese I
30-34.9
Obese II
35-39.9
Obese III
≥ 40
Healthy weight for your height (BMI 18.5-24.9)
53.5 – 72.0 kg
Health Risk Assessment
- • No significant risk factors detected
Goal Weight Calculator
Target Weight
63.6 kg
-6.4 kg
BMI at Different Weights
Shows how your BMI changes across a range of weights at your current height.
Additional Metrics
Ponderal Index
14.25 kg/m³
Height-cubed. Normal: 11-15
BMI Formula
weight (kg) ÷ height (m)²
= 70.0 ÷ 1.700²
Healthy Range
53.5–72.0 kg
BMI 18.5–24.9 for your height
About BMI & Its Limitations
BMI is a screening tool, not a diagnostic measure. It does not directly measure body fat or account for age, sex, ethnicity, muscle mass, or bone density.
- Athletes may have a high BMI due to muscle mass despite low body fat.
- Older adults may have more fat than BMI suggests due to muscle loss.
- Ethnic variations exist — e.g., Asian populations face higher cardiometabolic risk at lower BMI cut-offs.
- Waist circumference and waist-to-height ratio are stronger predictors of cardiovascular risk.
Medical Disclaimer: This tool is for educational purposes only and does not constitute medical advice. Consult a qualified healthcare professional for personalized guidance.
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Frequently Asked Questions
What is the BMI Calculator?
The BMI Calculator is a free online tool that calculates your Body Mass Index using your height and weight with support for both metric and imperial units.
Is the BMI Calculator free?
Yes, it is completely free with no registration required. All calculations happen client-side in your browser.
Does it support metric and imperial units?
Yes, the BMI Calculator accepts input in both metric (kg/cm) and imperial (lbs/inches) units for your convenience.
Is my data safe with this tool?
Absolutely. The BMI Calculator processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.
Does the BMI Calculator work on mobile devices?
Yes, the BMI Calculator is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.
Do I need to create an account to use this tool?
No account or registration is needed. Simply open the BMI Calculator in your browser and start using it immediately. There are no sign-up walls or usage restrictions.
How accurate are the calculations?
The BMI Calculator uses industry-standard formulas and algorithms to ensure accurate results. However, for critical financial or medical decisions, always consult a qualified professional.
How do I use the BMI Calculator?
Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.
Which browsers are supported?
The BMI Calculator works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.
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About Free BMI Calculator Online
Free BMI Calculator Online is a free, browser-based tool in our Calculator Tools collection. Everything runs locally on your device — no uploads, no sign-up, and your data stays private.