BMI Calculator With Categories
Use this BMI calculator for adults (body mass index calculator) to estimate BMI from height and weight and see your WHO BMI category from the BMI chart. Choose US units (ft/in, lb) or metric (cm, kg), enter your numbers, then click Calculate. BMI is a screening tool and does not measure body fat or muscle mass. If you lift regularly, compare BMI with waist size or body fat percentage. Not medical advice.
Your BMI (body mass index)
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Enter your height and weight to see your BMI and category.
How it's calculated
- BMI = kg / m^2.
- 1 in = 2.54 cm. 1 lb = 0.4536 kg.
- Category uses WHO BMI ranges.
BMI is a screening tool and not a diagnosis.
Methods & assumptions
This variant focuses on BMI Calculator With Categories.
This BMI calculator is intended for adults. It calculates body mass index (BMI) from height and weight and shows the WHO BMI category from the BMI chart. BMI is a screening tool and does not directly measure body fat, muscle, or body composition.
BMI formula
BMI = kg / m^2
BMI is rounded to 1 decimal.
- Output: BMI (1 decimal) and a WHO BMI category.
- Interpretation: Use it as a rough baseline, not a diagnosis.
Unit conversions (US to metric)
- 1 in = 2.54 cm
- 1 lb = 0.4536 kg
If you enter US units (ft/in, lb), this calculator converts to cm/kg before applying the BMI formula.
BMI categories chart (WHO)
Underweight
BMI range: < 18.5
Normal weight
BMI range: 18.5 to 24.9
Overweight
BMI range: 25.0 to 29.9
Obese I
BMI range: 30.0 to 34.9
Obese II
BMI range: 35.0 to 39.9
Obese III
BMI range: >= 40.0
If you lift regularly or have an athletic build, compare BMI with waist size or body fat percentage for better context.
More variants
Focused on bmi calculator for adults.
Focused on bmi for athletes.
Questions & Answers
Clear answers, so you can use this tool with confidence.
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