BMI calculator
Work out your body mass index from your height and weight. Useful as a rough screening number, but it is not a verdict on your health, and we will say plainly why.
BMI calculator
Height
Weight
YOUR BMI
26.1
Overweight range (25 to 29.9)
BMI is a rough screening number, not a verdict on your health. It ignores muscle, build and where you carry fat, so a muscular person can read “overweight” while being very healthy. Use it as one data point, alongside the trend on the scale and how you feel.
Beyond a single number
forme judges food by your goals, not a one-size-fits-all number, and tracks your day from a scan with a personal score.
What is BMI?
Body mass index is your weight in kilograms divided by your height in metres squared. It sorts people into ranges (under, healthy, over, obese) and is handy at population scale, which is why doctors use it as a quick first check.
Why BMI can mislead
It only knows your height and weight. It cannot tell muscle from fat, so a lean, muscular person can read “overweight”. It says nothing about where you carry fat (which matters more for health) or how fit you are. Treat it as one rough data point, not the whole story.
Common questions
- What is a healthy BMI?
- A BMI of 18.5 to 24.9 is classed as the healthy range for most adults. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese. These are screening bands, not a diagnosis.
- Is BMI accurate?
- It is a reasonable population-level screen but a blunt tool for any one person. It ignores muscle, build, age and where fat sits, so very muscular or very tall people are often misclassified. Use it alongside your waist, the scale trend and how you feel.
- Should I worry about my BMI?
- A BMI outside the healthy range is a prompt to look closer, not a verdict. Habits, fitness and trends matter more than a single number. If you are concerned, speak to a doctor. This is guidance, not medical advice.