Calculate your Body Mass Index instantly. Enter your height and weight to find your BMI, see your weight category, and discover your ideal healthy weight range.
Your Measurements
Enter your details below
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⚡ Quick Presets
Your BMI
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Category
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BMI SCALE
1018.5253040+
Healthy Range
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BMI 18.5–24.9
Healthy Weight
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for your height
BMI Prime
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ratio to upper normal
Ponderal Index
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kg/m³
BMI Value
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Category
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Healthy Weight Range
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Weight to Lose / Gain
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BMI Prime
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Ponderal Index
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Enter your measurements
Fill in your height and weight on the left to instantly calculate your BMI and health category.
BMI Categories
BMI Range
Category
Below 18.5
Underweight
18.5 – 24.9
Normal Weight
25.0 – 29.9
Overweight
30.0 – 34.9
Obese Class I
35.0 – 39.9
Obese Class II
40.0 +
Obese Class III
Formula: BMI = weight (kg) ÷ height² (m²) | BMI is a screening tool, not a diagnostic measure. Consult a healthcare provider for assessment.
Frequently Asked Questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is generally considered healthy for adults. However, BMI is a simplified screening measure and does not account for muscle mass, bone density, or fat distribution.
Is BMI accurate for everyone?
BMI can be misleading for athletes (high muscle mass may inflate BMI), the elderly (muscle loss may give a falsely normal BMI), and certain ethnicities where risk thresholds differ. It is best used alongside other health indicators.
What is BMI Prime?
BMI Prime is the ratio of your BMI to the upper normal limit (25). A BMI Prime of 1.0 means you are exactly at the upper boundary of normal. Values below 0.74 indicate underweight; above 1.0 indicate overweight.
What is the Ponderal Index?
The Ponderal Index (PI) is an alternative to BMI that scales weight by the cube of height rather than the square, making it more accurate at extreme heights. Normal range is roughly 11–14 kg/m³.