Health & Fitness
BMI Calculator
Calculate adult body mass index and see the standard weight category.
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Instant result
BMI
23.5
WHO adult category
Healthy range
BMI is a screening estimate, not a diagnosis; it does not measure body fat directly.
Healthy weight range for your height
56.7 kg – 76.3 kg
The weight span matching a BMI of 18.5–24.9.
Margin inside the healthy range
4.3 kg
How much you could gain and stay at or under a BMI of 24.9.
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Transparent methodology
What the result includes—and what it does not
Built for adults screening where their weight sits relative to the WHO healthy range, in metric or imperial units.
Calculation method
- 1BMI is weight in kilograms divided by height in meters squared; imperial entries are converted with the exact factors 1 lb = 0.45359237 kg and 1 in = 0.0254 m.
- 2Categories follow the WHO adult cut-offs: under 18.5 underweight, 18.5-24.9 healthy, 25-29.9 overweight, 30 and above obesity.
- 3The healthy weight range shown is the weight span matching a BMI of 18.5-24.9 at your exact height, and the distance to that range is computed from your entered weight.
Assumptions and limits
- BMI is a population screening measure, not a diagnosis: it does not distinguish muscle from fat and can misclassify athletic, elderly, or pregnant bodies.
- Adult cut-offs only; children and teens use age-and-sex growth references instead.
- Talk to a health professional before acting on any weight target shown here.
Worked example
Metric screening example
Input: 72 kg at 175 cm in metric units.
Output: BMI 23.5 (healthy range), a healthy-range span of 56.7-76.3 kg for that height, and a 4.3 kg margin left inside the range.
How to use it
Three steps. One clear answer.
- 1Enter or paste the values requested by the tool.
- 2Review the input units and choose any relevant options.
- 3Calculate, then copy or download the result you need.
Built for trust
Useful without the friction.
- No registration or paywall before your result.
- Responsive controls for phone, tablet, and desktop.
- Clear assumptions and warnings where estimates have limits.
Frequently asked questions
How does the BMI Calculator work?
BMI is weight in kilograms divided by height in meters squared; imperial entries are converted with the exact factors 1 lb = 0.45359237 kg and 1 in = 0.0254 m. Categories follow the WHO adult cut-offs: under 18.5 underweight, 18.5-24.9 healthy, 25-29.9 overweight, 30 and above obesity. The healthy weight range shown is the weight span matching a BMI of 18.5-24.9 at your exact height, and the distance to that range is computed from your entered weight.
What should I check before using the result?
BMI is a population screening measure, not a diagnosis: it does not distinguish muscle from fat and can misclassify athletic, elderly, or pregnant bodies. Adult cut-offs only; children and teens use age-and-sex growth references instead. Talk to a health professional before acting on any weight target shown here.
How current is this page?
The methodology and source notes were reviewed on 2026-07-25. Editable rates and inputs should still be checked against the provider or authority linked below.
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