BMI for 5ft 9in, 12st 5lb
Here’s the body mass index for someone 5ft 9in tall weighing 12 stone 5 pounds.
Healthy weight range for this height: 8st 13lb – 12st 1lb.
Different height or weight? Use the full BMI calculator for any measurement.
About body mass index
Body mass index (BMI) is a screening measure that divides your weight by the square of your height. It's used by doctors and health organizations worldwide as a quick, free way to flag whether someone might be underweight, at a healthy weight, overweight, or obese.
The formula is BMI = weight (kg) ÷ height (m)², or 703 × weight (lb) ÷ height (in)² in imperial units. A BMI of 18.5–24.9 is generally considered healthy for most adults.
BMI has real limitations — it can't tell muscle from fat, so athletes and very muscular people often score "overweight" despite low body fat. It also doesn't account for age, sex, or where fat is carried on the body. Use it as a general indicator, not a diagnosis.
BMI calculator questions
What body mass index means and how to use it.
What is BMI (Body Mass Index)?
BMI is a simple screening measure that uses your height and weight to estimate whether you're in a healthy weight range. It doesn't measure body fat directly, but it correlates with it for most people.
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². In imperial units, BMI = 703 × weight (lb) ÷ height (in)². Both formulas give the same result — our calculator handles the conversion automatically.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight. Below 18.5 is classified as underweight, 25–29.9 as overweight, and 30 or above as obese.
Is BMI accurate for everyone?
No. BMI doesn't distinguish between muscle and fat, so athletes and very muscular people often score as "overweight" despite having low body fat. It's also less reliable for older adults, pregnant women, and children.
Does BMI account for muscle mass?
No — BMI only uses height and weight, so it can't tell muscle from fat. Someone with a lot of muscle can have a high BMI while still being lean and healthy.
What BMI is considered overweight?
A BMI between 25.0 and 29.9 is classified as overweight. A BMI of 30 or higher falls into the obese category.
How do I find my healthy weight range?
Enter your height in the calculator above — it shows the weight range that corresponds to a BMI of 18.5 to 24.9 for your exact height.