BMI Calculator
Fast, accurate and free online bmi calculator tool running directly in your browser.
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This tool allows you to calculate BMI (Body Mass Index) in just a few seconds, i.e. body mass index used to assess normal weight in relation to height. Just enter your weight and height in the metric or imperial system, and the calculator will automatically provide your result and indicate your weight category.
Who is this calculator for
The tool will be useful for anyone who wants to assess whether their body weight is within the normal range. It is used by:
- people who care about their health and figure,
- athletes monitoring their body weight,
- dietitians and trainers working with clients,
- pupils and students during biology and health classes,
- everyone curious about their own BMI.
How to use the calculator
- Select units: metric (cm, kg) or imperial (ft, in, lbs).
- Enter your height and weight.
- ClickCalculateto see the result.
- The calculator will provide the BMI value and weight category according to WHO standards.
How it works
BMI is calculated according to the formula: body weight (kg) / height² (m²). For imperial units, the calculator automatically converts the values. The result is then compared with the table of categories: underweight, normal, overweight and obesity (I, II, III degree). This is a simple indicator that gives an approximate picture of the proportion of weight to height.
Examples of use
Example 1: 170 cm, 65 kg
BMI = 22.5 → normal.
Example 2: 180 cm, 95 kg
BMI = 29.3 → overweight.
Example 3: 160 cm, 48 kg
BMI = 18.8 → lower limit of normal.
WHO indicative table
| Category | BMI |
|---|---|
| Underweight | < 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25 – 29.9 |
| Obesity I degree | 30 – 34.9 |
| Obesity II degree | 35 – 39.9 |
| Obesity III degree | ≥ 40 |
Why is it worth using
- A quick and easy way to estimate your weight to height ratio.
- Ability to work in metric and imperial units.
- Result based on WHO standards.
- A great educational and practical tool.
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FAQ
Does BMI always tell the truth?
No. This is a general indicator. It does not take into account muscle mass or fat percentage. An athlete can have a high BMI despite having low body fat.
Is BMI different for women and men?
The standards are the same, but the interpretation may vary depending on body type.
Is BMI suitable for children?
Percentile charts are used for children, not the standard BMI for adults.
Most common errors
- Entering height in cm instead of meters without conversion.
- Errors converting imperial units.
- Treating BMI as the only indicator of health.
Safety
BMI does not tell everything about your figure - body fat distribution will be assessed byWHR calculator (waist-hip).