BMI Calculator for Men NZ
This BMI calculator for men works out your Body Mass Index from your height and weight, then adds an estimated body fat percentage based on your age and the healthy weight range for your exact height. The BMI formula is identical for everyone, weight in kilograms divided by height in metres squared, but the interpretation shifts for men. Men typically carry more muscle and less body fat than women at the same BMI, so this page pairs your BMI with the Deurenberg body fat estimate for men and shows what a typical healthy range looks like, usually about 8 to 20 percent for adult men. Enter your height, weight and age, and the calculator returns your BMI to one decimal place, the standard adult category it falls into, your estimated body fat percentage, and the weight band that keeps your BMI between 18.5 and 24.9. The muscle caveat matters more for men than almost anyone else: a lean, well muscled rugby player can register as overweight or even obese on BMI while carrying very little fat, because the formula cannot tell muscle from fat. Use the result as a quick screening figure and a way to track change over time, not as a diagnosis, and talk to your doctor about what a healthy weight looks like for you.
Body fat is estimated from BMI and age using the Deurenberg formula for men; a healthy range for adult men is typically about 8 to 20 percent. The healthy weight band keeps your BMI between 18.5 and 24.9.
General information only, not medical advice. BMI cannot tell muscle from fat, so lean, muscular men are often flagged as overweight. Talk to your doctor about what a healthy weight means for you.
How it works
BMI is your weight in kilograms divided by your height in metres squared. A result under 18.5 counts as underweight, 18.5 to 24.9 as the healthy weight range, 25 to 29.9 as overweight, and 30 or more as obese; the cut points are the same for men and women. The healthy weight band shown is the formula run in reverse: 18.5 and 24.9 multiplied by your height in metres squared gives the lightest and heaviest weights that keep you in the healthy range. The body fat estimate uses the Deurenberg equation for men, 1.2 times BMI plus 0.23 times age minus 10.8 minus 5.4, where the extra 10.8 reflects the lower body fat men carry at the same BMI. It is a statistical estimate from population data, not a measurement of your own body, so if you carry a lot of muscle the estimate will read high, and the only way to know precisely is a body composition scan.
Worked example
You are 35 years old, 178 cm tall and weigh 82 kg. Your height in metres squared is 1.78 x 1.78, which is 3.1684, and 82 divided by 3.1684 gives a BMI of 25.9, just inside the overweight range. The Deurenberg estimate is 1.2 x 25.9 plus 0.23 x 35 minus 10.8 minus 5.4, which is about 22.9 percent body fat, a touch above the typical healthy band of about 8 to 20 percent for adult men. The healthy weight range for 178 cm runs from 18.5 x 3.1684, which is 58.6 kg, up to 24.9 x 3.1684, which is 78.9 kg, so at 82 kg you sit about 3 kg above the top of the band. Whether that matters depends on composition: if the extra weight is muscle from training, the BMI flag is probably noise, but if it is carried around the waist it is worth acting on.
Related calculators
- BMI Calculator: standard BMI with metric and imperial units.
- Body Fat Percentage Calculator: body fat from tape measurements.
- Ideal Weight Calculator: ideal weight formulas for your height.
- Waist to Hip Ratio Calculator: where you carry weight.
- TDEE Calculator: daily energy needs.