BMI Calculator
Calculate your adult body mass index, BMI category, and healthy-weight range in metric or US units.
How this BMI calculator works
BMI divides weight in kilograms by height in metres squared. US measurements are converted before the same formula is applied.
This adult screening estimate is not a diagnosis. BMI can overstate body fat in muscular athletes and should be considered with other health information.
Method and source:CDC adult BMI guidance
Last reviewed: July 2026
How to use this calculator
Use the calculator as a practical starting point, then apply the result in the context of your training, recovery, and individual response.
- 1Enter the requested measurements or performance data.
- 2Choose the units and options that match your situation.
- 3Calculate, review the method and limitations, and adjust sensibly.
Frequently asked questions
How does this calculator work?
BMI divides weight in kilograms by height in metres squared. US measurements are converted before the same formula is applied.
How accurate is this calculator?
This adult screening estimate is not a diagnosis. BMI can overstate body fat in muscular athletes and should be considered with other health information.
Using your results
Every calculated 1RM is an estimate. Use the range as a training guide, and choose working weights that match your experience, technique, and current condition.
Safety tips
- Warm up thoroughly before attempting heavy lifts.
- Use controlled movement and proper technique.
- Use a spotter or safety equipment for near-maximal lifts.
- Increase the load gradually to reduce injury risk.
- Stop if you feel pain and allow enough time for recovery.
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