BMI Calculator

BMI is your weight in kilograms divided by your height in meters squared. In imperial units, that's 703 × weight in pounds ÷ (height in inches)². For example, a person who is 175 cm tall and weighs 70 kg has a BMI of 70 ÷ 1.75² ≈ 22.9. The calculator above handles both unit systems for you.

The standard adult categories are: Underweight below 18.5, Healthy from 18.5 to 24.9, Overweight from 25 to 29.9, and Obese at 30 and above. These are screening ranges used worldwide — they describe where a number falls, not a diagnosis on their own.

A healthy BMI is 18.5–24.9, and the matching weight range depends on your height. For someone 5'10" (178 cm), that's roughly 136–184 lbs (62–84 kg). The calculator shows your personal healthy weight range under your result.

BMI is a quick screening tool, not a full health verdict — it doesn't distinguish muscle from fat, so very muscular people can land in the "Overweight" range while being perfectly healthy. It also applies to adults, not children or teens, whose categories use age-based percentiles. Treat it as one data point, not the whole story.

BMI drops when weight drops relative to height, which comes from the usual combination of eating habits and movement — but this calculator isn't medical advice. If your result surprised you, a doctor or dietitian can look at the full picture, including factors BMI never sees like muscle mass, waist size, and bloodwork.