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Use this free BMI calculator and body mass index calculator to quickly check if you are in a healthy weight range for your height. It works as a BMI calculator for women and men, and shows your BMI score plus your healthy weight range.
Body Mass Index (BMI) is a simple way to calculate whether your weight is in a healthy range for your height. This BMI calculator works as a healthy weight calculator by comparing your BMI to standard ranges and showing whether you are underweight, a healthy weight, overweight, or obese. While BMI does not measure body fat directly, it is a widely used screening tool for weight‑related health risks.
The World Health Organization (WHO) has established BMI ranges for adults (age 20 and older), and they apply to both men and women. Whether you are using this BMI calculator for women or men, the same BMI categories are used to estimate your weight status:
| Classification | BMI Range (kg/m²) |
|---|---|
| Severe Thinness | < 16 |
| Moderate Thinness | 16 - 17 |
| Mild Thinness | 17 - 18.5 |
| Normal Weight | 18.5 - 25 |
| Overweight | 25 - 30 |
| Obese Class I | 30 - 35 |
| Obese Class II | 35 - 40 |
| Obese Class III | > 40 |
Carrying excess weight can increase the risk of developing several serious health conditions. According to health organizations, being overweight or obese is associated with:
Maintaining a BMI below 25 kg/m² is generally recommended, though it's important to consult with a healthcare provider to determine the best approach for your individual health needs.
Being underweight also poses health risks and may indicate underlying health issues:
If you're concerned about being underweight, especially if the cause isn't clear, it's important to consult with a healthcare professional. Being underweight can sometimes indicate underlying conditions that require medical attention.
While BMI is a valuable screening tool, it has limitations and should be considered alongside other health measurements rather than used as the sole indicator of healthy body weight.
Despite these limitations, BMI remains a useful indicator for approximately 90-95% of the population and should be used in combination with other health assessments to evaluate overall wellness.
BMI is calculated using your weight and height. The formula varies slightly depending on the measurement system used, but this online BMI calculator does the math for you instantly. You can use it as a quick weight calculator to understand how your current weight compares to a healthy BMI range.
BMI = weight (kg) ÷ height² (m)
Example: For a person weighing 70 kg and 1.75 m tall:
BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.9 kg/m²
BMI = 703 × weight (lbs) ÷ height² (inches)
Example: For a person weighing 154 lbs and 70 inches tall:
BMI = 703 × 154 ÷ (70 × 70) = 703 × 154 ÷ 4900 = 22.1 kg/m²
Yes. This tool is a completely free BMI calculator and healthy weight calculator. It shows your body mass index and an estimated healthy weight range based on standard BMI categories.
This BMI calculator works for both women and men. BMI ranges are the same for adult women and men, but your individual healthy weight goals should always be discussed with a healthcare professional.
A BMI calculator tells you where your current weight sits on the BMI scale, while a weight loss calculator or daily calorie calculator estimates how many calories you should eat to lose, maintain, or gain weight. You can use this BMI tool together with our calorie calculator and TDEE calorie calculator to plan your goals.
Important Note: This free BMI calculator provides a general assessment tool. For personalized weight loss calculator advice, calorie intake guidance, or healthy weight targets, please consult with a qualified healthcare provider or registered dietitian.
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