BMI Calculator
Calculate your Body Mass Index instantly with health insights. Get your BMI, healthy weight range, and personalized recommendations. 100% free and private.
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BMI Categories (WHO Standards)
Important to Know
- • BMI is a screening tool, not a diagnostic measure
- • It doesn't distinguish between muscle and fat mass
- • Athletes may have high BMI due to muscle mass
- • Different ethnic groups may have different risk thresholds
- • Always consult a healthcare provider for personalized advice
Why Choose Filator's BMI Calculator?
Instant Results
Get your BMI calculation instantly as you enter your height and weight. No waiting, no server processing—results appear immediately.
100% Private
Your health data never leaves your device. Unlike competitors, we process everything locally in your browser—complete privacy guaranteed.
Health Insights
More than just a number—get your BMI category, healthy weight range, and understand what your results mean for your health.
How to Calculate Your BMI Online
Body Mass Index (BMI) is a simple measurement that uses your height and weight to estimate whether you're at a healthy weight. Filator's free BMI calculator gives you instant results with complete privacy—your data never leaves your browser, unlike CDC.gov or Calculator.net which process on their servers.
Why Choose Filator's BMI Calculator?
Complete Privacy
Your height, weight, and health data stay on your device. Unlike Calculator.net and other sites that send your data to servers, Filator processes everything locally in your browser using JavaScript.
No Ads or Distractions
Calculator.net shows multiple banner ads around their BMI calculator. Filator provides a clean, distraction-free experience so you can focus on your health.
Works Offline
Install Filator as a Progressive Web App and calculate your BMI without internet. Perfect for tracking your health anywhere, anytime.
Modern Interface
Clean, modern design that works beautifully on desktop, tablet, and mobile devices. No cluttered interfaces or confusing options.
How to Calculate BMI Step-by-Step
- 1.Select your preferred unit system (Metric: kg/cm or Imperial: lbs/ft-in)
- 2.Enter your height accurately (measure without shoes, standing straight)
- 3.Enter your weight (weigh yourself in the morning with light clothing for consistency)
- 4.View your BMI result instantly along with your weight category
- 5.Review your healthy weight range and health recommendations
BMI Categories Explained
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Increased health risks |
| 18.5 - 24.9 | Healthy Weight | Lowest health risks |
| 25.0 - 29.9 | Overweight | Moderate health risks |
| 30.0 - 34.9 | Obesity Class 1 | High health risks |
| 35.0 - 39.9 | Obesity Class 2 | Very high health risks |
| 40.0 or above | Obesity Class 3 | Extremely high health risks |
BMI Formula Explained
Metric Formula
BMI = weight (kg) ÷ height² (m²)
Example: 70 kg ÷ (1.75 m)² = 70 ÷ 3.0625 = 22.9
Imperial Formula
BMI = (weight (lbs) × 703) ÷ height² (in²)
Example: (154 lbs × 703) ÷ (69 in)² = 22.7
BMI Limitations You Should Know
- Muscle Mass: Athletes and bodybuilders may have high BMI despite low body fat because muscle weighs more than fat
- Age Factor: Older adults may benefit from slightly higher BMI (23-30) for protection against frailty
- Ethnicity: Asian populations may have health risks at lower BMIs; adjusted ranges recommend 18.5-23 as healthy
- Body Composition: BMI doesn't distinguish between fat types or fat distribution
- Pregnancy: BMI calculations aren't accurate during pregnancy due to normal weight changes
- Children: Kids and teens need age and sex-specific growth charts, not standard BMI ranges
Common Use Cases
Weight Management
Track your BMI progress over time as you work toward weight loss or fitness goals
Health Screening
Quick initial assessment of weight status before medical appointments
Fitness Planning
Set realistic weight targets based on healthy BMI ranges for your height
Nutritional Goals
Understand where you are to plan appropriate calorie intake and diet changes
Frequently Asked Questions
How do I calculate my BMI?
BMI is calculated by dividing your weight in kilograms by your height in meters squared (BMI = kg/m²). For imperial units, multiply your weight in pounds by 703, then divide by your height in inches squared. Our free BMI calculator does this instantly—just enter your height and weight.
What is a healthy BMI range?
According to the CDC and WHO, a healthy BMI for adults is between 18.5 and 24.9. Below 18.5 is considered underweight, 25-29.9 is overweight, and 30 or above is classified as obese. However, BMI should be considered alongside other health factors.
Is BMI accurate for muscular people?
BMI has limitations for very muscular individuals. Since muscle weighs more than fat, athletes and bodybuilders may have a high BMI despite having low body fat. For more accurate assessment, consider body fat percentage measurements alongside BMI.
Is this BMI calculator safe to use?
Yes, absolutely. Unlike many online calculators, Filator processes everything locally in your browser. Your height, weight, and health data never leave your device—ensuring complete privacy. No signup required, no data collection.
What are the BMI categories?
BMI categories for adults are: Underweight (below 18.5), Normal/Healthy weight (18.5-24.9), Overweight (25-29.9), Obesity Class 1 (30-34.9), Obesity Class 2 (35-39.9), and Obesity Class 3/Severe (40 or above).
How do I calculate BMI in kg and cm?
To calculate BMI with kg and cm: First convert your height from cm to meters by dividing by 100. Then use the formula BMI = weight (kg) / height (m)². For example, if you're 170 cm and 70 kg: BMI = 70 / (1.70)² = 70 / 2.89 = 24.2.
Does BMI work the same for men and women?
The BMI formula is identical for men and women, but interpretation may vary. Women naturally have higher body fat percentages than men at the same BMI. While the healthy BMI range (18.5-24.9) applies to both, optimal values within that range may differ by gender.
Can I use this BMI calculator offline?
Yes! Filator works as a Progressive Web App (PWA). After your first visit, you can install it to your device and use the BMI calculator offline. Perfect for tracking your health without needing internet access.
Ready to Calculate Your BMI?
Get your BMI instantly with complete privacy—no signup, no ads, no data collection. Unlike Calculator.net and other sites cluttered with advertisements, Filator gives you a clean, modern experience focused entirely on your health.