BMI Calculator
Calculate your Body Mass Index and healthy weight range.
How to use
- 1
Choose Metric (kg/cm) or Imperial (lb/ft+in)
- 2
Enter your weight and height
- 3
Read your BMI value, category and where you sit on the scale
BMI Calculator — Body Mass Index in Metric & Imperial
Free BMI calculator that instantly tells you your Body Mass Index, category and where you fall on the healthy weight scale.
Skycally's BMI Calculator computes your Body Mass Index from your weight and height in either metric or imperial units. BMI is a quick screening tool used by health professionals to estimate whether someone is underweight, at a healthy weight, overweight or obese, based on the relationship between mass and height.
After you enter your numbers, the calculator shows your BMI to one decimal, classifies it using the standard WHO categories (Underweight <18.5, Normal 18.5–24.9, Overweight 25–29.9, Obese ≥30), and plots your position on a color-coded scale so you can see at a glance how close you are to neighboring categories.
BMI is a useful starting point, but it doesn't account for muscle mass, bone density, age or body composition. Athletes and very muscular people often score 'overweight' despite being healthy. Treat the result as a guideline and talk to a healthcare professional for a complete assessment.
Frequently Asked Questions
What is a healthy BMI?
The WHO considers a BMI of 18.5 to 24.9 as the normal/healthy range for most adults.
Is BMI accurate for athletes?
Not always. Muscle weighs more than fat, so very muscular people can have a high BMI without excess body fat.
Does BMI work for children?
No. Children and teens use age- and sex-specific BMI percentiles instead of the adult categories.
Is my data saved?
No. Everything is calculated in your browser and never sent anywhere.
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