BMI Calculator
Check your body mass index with metric or imperial units and see where you land on the healthy range.
Results update instantly. BMI is a screening tool, not a diagnosis — consult a healthcare provider for personal advice.
A BMI of 22.9 falls in the normal weight range. For your height, a healthy weight is roughly 56.7–76.3 kg.
What is BMI Calculator?
Body Mass Index (BMI) is a simple screening tool that uses your height and weight to estimate whether you are underweight, a normal weight, overweight, or obese. It is widely used by healthcare professionals to flag potential weight-related health risks. While BMI does not measure body fat directly, it is a quick, free, and useful starting point for understanding healthy weight ranges.
How to use it
- Choose your preferred unit system — metric (cm, kg) or imperial (ft, in, lb).
- Enter your height and weight into the fields above.
- Your BMI value, weight category, and position on the healthy range gauge appear instantly.
- Use the Copy button to save your result, or change the inputs to compare scenarios.
BMI formula
Metric: BMI = weight (kg) ÷ height (m)². Imperial: BMI = [weight (lb) × 703] ÷ height (in)². The result is a single number interpreted against standard category ranges.
Frequently asked questions
A BMI between 18.5 and 24.9 is generally considered a healthy weight for most adults. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is classified as obese.
BMI is a screening tool, not a diagnostic. It can overestimate body fat in muscular individuals and underestimate it in older adults who have lost muscle. Athletes, pregnant women, and the elderly should interpret BMI alongside other measures.
The formula is identical for both sexes, but men typically carry more muscle and women more body fat at the same BMI. Some calculators apply small sex-based adjustments, but the standard ranges remain the same.
Divide your weight in kilograms by your height in meters squared. For example, 70 kg ÷ (1.75 m × 1.75 m) = 22.9. This calculator does the conversion for you automatically.
No. BMI cannot distinguish between muscle and fat. A very muscular person may register as overweight despite having low body fat. For a fuller picture, pair BMI with waist circumference or a body fat estimate.
A BMI below 18.5 is classified as underweight, which can sometimes indicate insufficient nutrition or an underlying health condition. If this applies to you, consider speaking with a healthcare provider.
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