BMI Calculator
Sophia · your coach
BMI is a quick, rough screen — useful context, not the whole story. Pop in your height and weight and I'll show you where it lands.
Your BMI
22.9
Healthy weight
What BMI can and can't tell you
BMI (body mass index) is your weight divided by your height squared. It's a quick, population-level screen for whether your weight sits in a healthy range — cheap, fast and useful as a rough first look.
But it's blunt: it can't tell muscle from fat, ignores where you carry weight, and flags plenty of athletes as "overweight." Use it as one data point, not a verdict. Your weight trend over time, your waist measurement and how you feel tell a truer story.
Frequently asked questions
What is a healthy BMI?
18.5 to 24.9 is the standard "healthy weight" band. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese — but these are screening categories, not a diagnosis.
Is BMI accurate?
As a quick screen across a population, it's reasonable. For an individual — especially anyone muscular — it can mislead, because it can't distinguish muscle from fat. Pair it with a waist measurement and your weight trend.
Why does BMI call me overweight when I'm lean?
BMI only knows your height and weight, not your body composition. Muscle is dense, so trained, lean people often land in the "overweight" band despite low body fat. That's a limit of the metric, not a problem with you.
Should I use BMI to set a goal?
It's fine for a ballpark healthy-weight range, but a specific target weight and a realistic pace make a better goal. That's what the goal-weight calculator is for — and what Sophia coaches around your real trend.
More free calculators
Want the why? Read: Why the scale lies (and what to read instead)