Your body mass index, weight category, and healthy weight range — tuned for adult men.
Everything runs in your browser. Nothing is uploaded.
A body-mass-index number isn’t magic. It’s a ratio of your weight to your height, and for most adult men it lands somewhere between 18.5 and 30. The World Health Organization uses the same threshold table for men and women, but the way that number reads on your body can be different. Men tend to carry more lean muscle, more of that mass sits centrally (belly, chest), and the same BMI can look very different on a lifter versus a desk worker of the same height.
The calculator above uses the standard formula — weight in kilograms divided by height in meters squared — and buckets your number into the WHO categories: under 18.5 is underweight, 18.5 to 24.9 is the healthy range, 25 to 29.9 is overweight, and 30 and up is the obesity range in three classes. It also shows the healthy weight range in kilograms and pounds for your exact height, so you know where the goalposts sit.
One thing worth calling out for men: BMI is a rough screen, not a diagnosis. If you deadlift twice your bodyweight and have a 32-inch waist, a “30 BMI” is meaningless. Waist-to-height ratio is often a better single number for men — keep your waist under half your height and most of the metabolic-risk research says you’re in reasonable shape. That said, the average sedentary guy who’s picked up a few pounds since college will see BMI creep up honestly, and it’s a useful nudge.
The tool also displays four ideal-weight formulas — Devine, Robinson, Miller, and Hamwi. They were built by different researchers between the 1960s and 1980s (Devine started as a drug-dosing formula, not a fitness target), and they give slightly different answers on purpose. Treat the spread as a sanity check: if your current weight sits inside that range and your waist is reasonable, you’re fine. If you’re 40 pounds above the top of the range, that’s a signal.
If you’re a teenager, this page isn’t for you — use our Teen BMI Calculator instead, because kids and teens are read on age-and-sex percentile curves, not adult thresholds.
The WHO healthy range is 18.5 to 24.9 for adult men. There’s no separate male threshold — the categories are unisex — but men typically sit slightly higher in the range because of more lean mass.
Yes, in the sense that it can mislead you. BMI can’t distinguish muscle from fat. A rugby forward or a heavy lifter can score in the “overweight” or “obese” range while carrying single-digit body fat. Waist circumference or a DEXA scan gives a much more honest read.
In the US, adult male BMI averages around 29 (CDC NHANES data). In the UK and most of Europe, it’s a bit lower, around 27 to 28. That’s the average, not the target — the healthy range still tops out at 24.9.
Not necessarily. Longevity research (the Global BMI Mortality Collaboration meta-analysis, 2016) suggests the sweet spot for adult men is roughly BMI 22 to 25 — the middle-to-upper part of the healthy band, especially if the extra mass is muscle.
A little. Older adults (65+) tend to have slightly better outcomes at a BMI of 23 to 27 rather than 20 to 22, because a small buffer of body mass protects against acute illness and falls. The healthy range is still 18.5–24.9 for adults, but don’t chase the low end if you’re over 60.
Waist-to-height ratio is a strong single number — keep your waist below half your height. For a more complete picture, combine BMI, waist circumference, resting blood pressure, and (if you’re serious) a body-fat scan.
We wrote a plain-English guide that covers the history, the limits, and what to actually do about your number.
Read the BMI guide →