Adult BMI Calculator
Enter height and weight on the left, choose the reference standard, and the right side shows BMI, category, and normal-weight range.
Input
Enter height and weight, then calculate.
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Result
- Selected standard
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- Normal-weight range
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- Distance to range
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- Formula
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- Input summary
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BMI is an adult screening index. It does not diagnose body composition, pregnancy, growth, athletic build, or medical conditions.
ready to use.
- Visible firstKeep the input and result positions clear.
- Results firstPut the main number up front and keep the process secondary.
- Less to askNo sign-up or extra information before using the tool.
How to read BMI against adult reference ranges
BMI divides weight in kilograms by height in meters squared. The formula is simple, but the category depends on the reference range you choose, so this tool keeps Asian and WHO/CDC ranges visible.
The number is not a diagnosis. Body composition, waist size, blood pressure, glucose, pregnancy, growth, athletic muscle mass, and medical treatment can change what the number means.
The formula is fixed; the reference changes the label
Metric and imperial entries are converted to kg and meters, then BMI is rounded to one decimal place.
- Metric: 170 cm and 70 kg β 70 Γ· 1.70Β²
- Imperial: feet/inches and pounds convert before the same formula
- Output: adult screening ranges only
Use the screen left to right
Choose a unit, enter height and weight, then choose the reference. The result window updates the BMI, category, standard label, normal-weight range, and distance note.
Asian ranges flag some risks earlier
Many Asian public-health references discuss increased metabolic risk around BMI 23. That is why the same BMI may move into a caution range under the Asian setting.
WHO/CDC ranges are useful for global comparison
The common adult range of 18.5β24.9 is widely used in international and U.S. materials, making it useful when comparing documents or guidance.
The normal-weight range is a reference rail
It applies the chosen normal BMI interval to your height. It is not a personal prescription or a required target.
- High muscle mass can raise BMI without high body fat.
- Older adults or people with illness may need different weight goals.
- Medical history and body composition matter.
Example: 170 cm and 70 kg
The result is about 24.2. Asian ranges may label it as increased risk, while WHO/CDC ranges may keep it in the normal interval.
Imperial input uses the same calculation
5 ft 10 in and 154 lb are converted internally before the formula is applied, so reference selection remains the important choice.
When BMI is not enough
Children, pregnancy, edema, rapid weight change, very muscular athletes, eating-disorder care, and chronic disease management require more context.
What the copy button includes
The copied line includes BMI, category, reference, normal-weight range, and the distance note. It is for personal notes, not a medical document.
Why official sources are linked
BMI cut points are public-health screening tools. WHO, CDC, and local health guidance help explain the boundaries, while personal decisions belong with a clinician.
BMI questions before using the number
What does this BMI calculator show?
It calculates body mass index from adult height and weight, then shows the category under the selected reference range. It is a screening number, not a diagnosis.
Why are Asian and WHO/CDC standards different?
Asian public-health references often flag risk at lower BMI cut points, while WHO/CDC ranges are commonly used for global or U.S. comparisons.
What is the BMI for 170 cm and 70 kg?
170 cm and 70 kg gives a BMI of about 24.2. It can be classed differently depending on whether Asian or WHO/CDC ranges are selected.
Is the normal-weight range a target weight?
No. It is the selected normal BMI interval applied to your height. Personal goals need medical history, body composition, and context.
Can children, pregnant people, or athletes use this?
This screen is for general adult reference. Growth, pregnancy, high muscle mass, and medical treatment need more specific assessment.
Use public-health references for screening context; personal diagnosis or treatment belongs with a qualified clinician.