Body mass index (BMI) is the quickest, most widely used screening tool for whether a man's weight is in a range associated with better long-term health. This calculator is built specifically for men using the units most American adults know — pounds for weight and feet-and-inches for height — so you do not have to convert anything to metric by hand. Enter your numbers and you instantly get your BMI, your NIH/WHO weight category, your BMI Prime, and the healthy weight range for your exact height.
BMI is not a perfect measure by any means; it cannot tell muscle from fat, and a very muscular athlete can land in the "overweight" band while carrying almost no body fat. Even so, for the vast majority of adult men it tracks closely enough with waist size, blood pressure, cholesterol, and diabetes risk to be worth checking once or twice a year.
How to Use
- Type your Weight in pounds into the first field. Weigh yourself in the morning, without shoes and after using the bathroom, for the most repeatable number.
- Enter your height as two separate numbers: Height (feet) and Height (inches). A man who is 5 feet 10 inches tall enters
5in the feet box and10in the inches box. - Read the result card. Your BMI is shown first and highlighted, followed by your Weight Category (Underweight, Normal weight, Overweight, or Obese), your BMI Prime, and the Healthy Weight window for your height.
- Use the healthy weight range as a target band, not a single number. If your current weight is above the upper end, even a 5–10% reduction meaningfully lowers blood pressure, blood sugar, and joint stress.
- Slide the weight up and down to see how many pounds you would need to gain or lose to move between categories. A 5'10" man, for example, crosses from Overweight to Normal weight when he drops below about 174 pounds.
The math behind the result is simple: total height in inches is squared, then divided into 703 times your weight in pounds. The constant 703 is the conversion factor that turns pounds-per-square-inch into the standard kilograms-per-square-meter scale everyone's categories are defined on.
The BMI Formula for Men (Imperial)
The standard Quetelet index, adopted by the World Health Organization and the U.S. NIH/NHLBI, is:
BMI = 703 × weight (lb) ÷ height (in)²
For example, a 5'10" man (70 inches) weighing 180 pounds:
- BMI = 703 × 180 ÷ (70 × 70) = 126,540 ÷ 4,900 = 25.8
That places him just inside the "Overweight" band (25.0–29.9). The same formula in metric units is BMI = weight(kg) ÷ height(m)²; the 703 constant only appears in the imperial version because pounds and inches need to be converted to kilograms and meters.
The adult male categories used by the CDC and WHO are identical to the adult female categories, because BMI is a height/weight index and not a sex-specific measurement:
- Underweight: below 18.5
- Normal weight: 18.5–24.9
- Overweight: 25.0–29.9
- Obese: 30.0 and above
BMI Prime (your BMI divided by 25) is a small extra number: a value of 1.0 means you are exactly at the upper edge of normal, 0.8 means you are 20% below it, and 1.2 means you are 20% above it.
Why Men Should Pay Attention to BMI
Men tend to carry excess fat around the abdomen (apple shape) rather than the hips and thighs, and abdominal fat is more strongly linked to insulin resistance, high blood pressure, and elevated triglycerides. That is why a BMI in the overweight range for a man is often more concerning than the same number for a woman with a similar body shape.
Research from the CDC shows that roughly 70% of U.S. men are now either overweight or obese, and men in the obese category have a 2- to 3-fold higher risk of developing type 2 diabetes than men in the normal range. The good news is that you do not need to reach an "ideal" BMI to capture most of the benefit: losing just 5–10% of body weight has been shown in clinical trials to improve blood pressure, LDL cholesterol, and fasting glucose, and to reduce sleep-apnea severity.
Athletes and very muscular men should interpret their BMI differently. If you can deadlift more than your body weight and have a waist under 40 inches, a BMI of 26–28 is usually muscle, not fat. In those cases, waist-to-height ratio (ideally under 0.5) and body-fat percentage are better second opinions than the BMI number alone.
Examples
Example 1 — The 5'10" office worker. A 38-year-old man weighs 180 lb and is 5 ft 10 in tall. His BMI is 25.8, which puts him in the Overweight band. The healthy weight range for his height is 129–174 lb, so he only needs to lose about 6 lb to cross back into Normal weight — a gap of roughly 3% of his body weight.
Example 2 — The 5'7" active father. A 42-year-old man weighs 150 lb and stands 5 ft 7 in. His BMI works out to 23.5, squarely in the Normal range, with BMI Prime 0.94. His healthy window is 118–159 lb, so even gaining 10 lb would not push him overweight.
Example 3 — The 6 ft man concerned about diabetes. A 45-year-old man weighs 220 lb and is 6 ft tall (72 in). His BMI is 29.8 — only 0.2 below the 30.0 Obese threshold. Losing 5% of his body weight (about 11 lb) would bring him to roughly 28.4, well out of the Obese band, and studies suggest that kind of drop can cut diabetes risk by close to 58% in prediabetic adults.
Example 4 — The former college athlete. A 35-year-old man who lifts weights regularly weighs 210 lb at 5 ft 11 in. His BMI shows 29.3, technically "Overweight," but his waist is 34 in and his body-fat percentage is around 15%. Here the BMI overstates his risk; the calculator is a screening tool, not a diagnosis, and he should trust his waist size and recent bloodwork over the number on the card.
FAQ
What is a good BMI for a man?
For adults age 20 and older, a BMI between 18.5 and 24.9 is considered normal. For men in particular, many clinicians think the lower-middle of that range (roughly 21–24) is associated with the lowest cardiovascular and metabolic risk, but anything under 25 is healthy.
How is BMI calculated for men using pounds and inches?
Multiply your weight in pounds by 703, then divide by your height in inches squared. For example, a 180 lb, 5'10" man does: 703 × 180 ÷ (70 × 70) = 25.8. The 703 constant converts pounds/in² to the standard kg/m² scale.
Why does this calculator use feet and inches instead of just inches?
Most American men still quote their height as 5'10" rather than 70 inches, and weight in pounds rather than kilograms. Splitting height into feet and inches removes the mental math and the conversion errors that come with mixing units mid-formula.
Is BMI accurate for muscular men?
No, not by itself. BMI cannot distinguish muscle from fat, so a man with a lot of lean mass — a weightlifter, football lineman, or construction worker — can read as Overweight or even Obese while having low body fat. For those men, pair this result with waist circumference (under 40 in) or a body-fat estimate before making health decisions.
What weight should a 5'10" man be?
Using the 18.5–24.9 range, a 5'10" (70 in) man's healthy weight window is roughly 129 to 174 pounds. The midpoint is about 152 lb, but anywhere in that range is fine — BMI is a band, not a target to chase exactly.
How much weight do I need to lose to move out of the overweight category?
Subtract your current weight from the upper end of the healthy range shown on the result card. For a 5'10" man at 190 lb, that upper end is 174 lb, so 16 lb (about 8% of body weight) gets him back to Normal. Clinical guidelines note that even a 5–10% loss produces measurable improvements in blood pressure, cholesterol, and blood sugar.
Does BMI differ for men and women?
No. The same 18.5/25/30 cutoffs apply to all adults age 20–65. What differs is typical body-fat distribution: men tend to store fat in the abdomen, which is why the same BMI number can carry a slightly higher metabolic risk for a man than for a woman with a pear shape.
Disclaimer
This BMI calculator for men is provided for informational purposes only and is not medical advice. It uses the standard Quetelet index (703 × lb ÷ in²) and the CDC/WHO adult categories, but BMI does not measure body fat directly and does not account for muscle mass, age, ethnicity, waist size, or existing medical conditions. It should not be used to diagnose disease, prescribe a diet, or replace a consultation with a licensed physician or registered dietitian. If you are concerned about your weight, blood pressure, blood sugar, or any symptom, please speak with a qualified healthcare provider who can evaluate you in person.