BMI / Masa Corporal Calculator
Estimate your Body Mass Index (BMI), also known as Índice de Masa Corporal (IMC), using metric or imperial units.
This tool is for educational purposes and does not replace medical advice.
What is a masa corporal calculator?
A masa corporal calculator helps you estimate your BMI (Body Mass Index), a simple number based on your weight and height. It is one of the most common screening tools used to quickly classify weight status in adults. While it does not directly measure body fat, it offers a useful first snapshot of potential health risk.
Why people use BMI calculators
- To track whether their weight is changing over time.
- To identify if they are underweight, at a healthy range, overweight, or in obesity ranges.
- To set practical fitness and nutrition goals.
- To start health conversations with a doctor or nutrition professional.
How BMI is calculated
The calculator uses one of two formulas depending on your selected units:
- Metric: BMI = weight (kg) / [height (m)]²
- Imperial: BMI = 703 × weight (lb) / [height (in)]²
After calculating your BMI, the tool also shows your category and a healthy weight range for your height. This can help you understand where your current result sits and what a target range may look like.
BMI categories at a glance
| BMI Value | Category | General Interpretation |
|---|---|---|
| Below 18.5 | Underweight | May indicate low body weight for height. |
| 18.5 - 24.9 | Healthy Weight | Associated with lower risk in many populations. |
| 25.0 - 29.9 | Overweight | May increase risk for metabolic and cardiovascular issues. |
| 30.0 and above | Obesity | Higher risk for chronic conditions; medical guidance is recommended. |
How to use this calculator correctly
1) Choose your unit system
Select metric if you know your weight in kilograms and height in centimeters, or imperial if you use pounds, feet, and inches.
2) Enter accurate measurements
For best results, use a recent weight and height measurement. Small errors can noticeably change your BMI.
3) Review result and interpretation
Look at your BMI number, category, and healthy weight range together. This gives better context than the number alone.
Important limitations of BMI
BMI is useful, but it is not perfect. Keep these points in mind:
- It does not distinguish fat mass from muscle mass.
- Highly trained athletes may have high BMI with low body fat.
- Older adults may have normal BMI but low muscle mass.
- Body composition and health risk can vary by ethnicity, age, and sex.
For a fuller picture, combine BMI with waist measurement, blood pressure, blood sugar, lipid profile, physical activity, sleep quality, and overall diet pattern.
Tips for improving body composition
- Prioritize whole foods: vegetables, fruit, legumes, lean proteins, whole grains, and healthy fats.
- Strength train 2-4 times per week to support muscle mass.
- Include regular walking or cardio for heart health and calorie balance.
- Sleep 7-9 hours consistently to support recovery and hormone regulation.
- Track trends over weeks, not daily fluctuations.
Frequently asked questions
Is BMI the same as body fat percentage?
No. BMI is a height-weight ratio, while body fat percentage estimates how much of your body is fat tissue.
Can I use this calculator for children?
Not directly. Children and teens require age- and sex-specific BMI percentiles. Pediatric growth charts should be used instead.
What should I do after getting my BMI?
Use it as a starting point. If your result is outside the healthy range, consider discussing personalized goals with a healthcare professional, especially if you have existing medical conditions.