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Calculate your Body Mass Index (BMI) to assess your weight status.
23.0
Normal
Healthy Weight
128.9lb - 174.2lb
Ponderal Index
12.9 kg/m³
Your Result
Normal
Healthy Target
Normal
Disclaimer: This calculator is for informational purposes only. Consult a healthcare professional for personal medical advice.
You're in a healthy range! The key now is consistency. A balanced diet and regular activity will help you stay here.
| Activity Type | Examples | Recommended Duration |
|---|---|---|
| Cardiovascular | Brisk walking, running, cycling, swimming | 150+ minutes/week (moderate) |
| Strength Training | Weight lifting, bodyweight exercises | 2+ days/week, all major muscle groups |
| Balanced Diet | Focus on whole foods, lean protein, fruits, and vegetables | Daily consistency is key |
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Everything you need to know
Body Mass Index (BMI) is a simple screening tool that uses your height and weight to estimate whether you're at a healthy weight for your frame. While not a perfect measure of body fat or overall health, BMI is the most widely used initial screening tool by doctors, insurers, and health organizations worldwide because it's easy to calculate and strongly correlated with metabolic health risks at the population level.
Understanding your BMI category helps you identify potential health risks and take proactive steps toward better health. However, BMI should always be interpreted alongside other measures like waist circumference, body fat percentage, and lifestyle factors.
While the BMI formula is the same for all genders and ages, your gender and age provide important context:
Our BMI calculator works with both US and metric units:
Select Your Unit System
Enter Your Measurements
Select Your Gender
Enter Your Age
Review Your Results
BMI = Weight (kg) / Height (m)²
Or in US units:
BMI = (Weight (lbs) / Height (in)²) × 703
Example 1: Average Adult Male
Example 2: Average Adult Female
Example 3: Athletic Build
| Category | BMI Range | Health Risk Level |
|---|---|---|
| Severe Thinness | < 16 | High |
| Moderate Thinness | 16 - 17 | Moderate-High |
| Mild Thinness | 17 - 18.5 | Moderate |
| Normal | 18.5 - 25 | Low |
| Overweight | 25 - 30 | Moderate |
| Obese Class I | 30 - 35 | High |
| Obese Class II | 35 - 40 | Very High |
| Obese Class III | > 40 | Extremely High |
Research consistently shows that BMI correlates with:
This range represents the lowest all-cause mortality risk in large population studies. However, individual optimal weight varies based on:
BMI is a screening tool, not a diagnosis. Important limitations include:
Doesn't distinguish fat from muscle:
Doesn't account for fat distribution:
Population differences:
For a complete health picture, consider:
Profile: 5'9", 183 lbs, desk job, no regular exercise
Health implications:
Action plan:
Profile: 5'6", 136 lbs, normal BMI, never exercises
Health implications:
Action plan:
Profile: 5'4", 180 lbs, family history of diabetes
Health implications:
Action plan:
Focus on sustainable habits, not crash diets
Prioritize protein and fiber
Move regularly
Monitor trends, not single measurements
Address underlying factors
No. BMI is a population-level screening tool and has limitations for individuals. It doesn't distinguish between muscle and fat, doesn't account for body frame size, and may misclassify very muscular people as overweight. It's most accurate for average adults with typical body compositions. Athletes, older adults, and pregnant women should use BMI cautiously and consider additional measures like body fat percentage and waist circumference.
Body fat percentage is generally more informative for individual health assessment because it directly measures adiposity. However, BMI is easier to measure (just height and weight) and correlates well with body fat for most people. For optimal health assessment, use both: BMI as a quick screening tool, and body fat percentage (measured via DEXA, bioimpedance, or calipers) for a more complete picture.
Yes, it's possible. Some people with BMI 25-30 have normal blood pressure, cholesterol, and blood sugar—a state sometimes called "metabolically healthy obesity." However, research shows this state is often temporary, and health risks increase over time. Even if current markers are good, carrying excess weight increases long-term risk of joint problems, sleep apnea, and certain cancers. Focus on overall health habits rather than BMI alone.
For most adults, checking BMI monthly is sufficient. Daily weight checks can be discouraging due to normal fluctuations. If actively trying to lose or gain weight, weekly weigh-ins at the same time of day (morning, after bathroom, before eating) provide useful trend data without the stress of daily variation.
Research suggests slightly higher BMI (25-27) may be protective for adults over 65, possibly because it provides nutritional reserves during illness. However, this is controversial and individual factors matter greatly. Older adults should focus more on maintaining muscle mass, mobility, and functional independence rather than achieving a specific BMI.
Why doesn't BMI account for muscle mass? BMI uses only height and weight, not body composition. Muscular athletes may have high BMI despite low body fat. This is why BMI is a screening tool, not a definitive health measure.
BMI uses only height and weight, not body composition. Muscular athletes may have high BMI despite low body fat. This is why BMI is a screening tool, not a definitive health measure.
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This calculator is provided for educational and informational purposes only. It is not medical, fitness, nutritional, or professional advice. Results are estimates based on the assumptions and inputs you provide.
Actual results may differ significantly due to:
Do not rely on this calculator for:
Before making any health or fitness decisions, consult with:
Past performance and estimates do not guarantee future results. Always verify important information independently and consult qualified professionals for your individual circumstances.