BMI Calculator for Men

This calculator accepts age, height and weight. It computes BMI = weight in kilograms ÷ height in meters². The existing imperial convention is BMI = 703 × weight (lb) ÷ height (in)². Height converts using 2.54 cm per inch for the reference weight band.

CDC adult BMI calculator (26 June 2024) is intended for adults aged 20 and older. This form follows that age scope. Adult screening thresholds are the same for women and men; the calculator does not use separate sex-specific BMI categories.
References and method last checked: 2026-09-30. Source publication or update dates are shown separately.

BMI describes weight relative to height. It does not directly measure fat, muscle or health and is a screening measure rather than a diagnosis.

Adult screening categories use the unrounded calculated BMI: below 18.5 is underweight; 18.5 to below 25 is healthy weight; 25 to below 30 is overweight; 30 to below 35, 35 to below 40, and 40 or higher are obesity classes I, II and III.

The displayed value is rounded separately. For example, an unrounded BMI of 24.96 may display as 25.0 while remaining below the category boundary. The category is a screening label, not a disease diagnosis.

The body-fat output is a separate prediction from Deurenberg et al. (1991), not part of the BMI category and not a direct measurement. The original study included 1,229 subjects aged 7–83, with BMI 13.9–40.9; it reported an adult prediction error of about 4.1 percentage points and some overestimation in obese subjects.

Predicted body fat (%) = 1.20 × BMI + 0.23 × age − 16.2. The adult paper’s sex coefficient is 0 for females and 1 for males in the combined equation. This route uses the male coefficient.

The result does not provide body-fat health categories or an age-adjusted diagnosis. Values below 0%, above 100%, or non-finite values are shown as unavailable rather than clamped to a physical limit. Inputs outside the study’s observed range are extrapolations and should not be treated as validated individual estimates.

The reference weight band is derived from the existing BMI endpoints 18.5 and 24.9, not a Hamwi or body-frame formula.

Lower reference weight (kg) = 18.5 × height (m)²; upper reference weight (kg) = 24.9 × height (m)². Imperial results convert these masses to pounds. At 1.65 m, the unrounded reference is approximately 50.4–67.8 kg; displayed precision depends on the calculator’s existing rounding.

This arithmetic describes weights corresponding to a screening band. The 24.9 reference endpoint is a display convention; the healthy-weight category extends to below 25. It is not a personal goal or a recommendation to gain or lose the difference.

CDC adult BMI calculator (26 June 2024) notes that BMI is only one potential health indicator. Its categories do not identify a particular disease or establish an individual probability of harm.

Medical history, behavior, examination and laboratory findings can affect assessment. The form does not collect these factors or waist measurements and does not give a treatment or calorie prescription.

• BMI does not distinguish fat, muscle and bone mass or show fat distribution.
• It does not adjust its screening category for athletic build, ethnicity, pregnancy or age beyond the adult eligibility gate.
• A BMI-derived body-fat prediction has model error and cannot replace a measurement.
• The reference weight band cannot determine an individual nutrition or exercise plan.

Consider these results with other clinical information when seeking an assessment. The same adult BMI thresholds on this route do not imply that every person at the same BMI has the same body composition or health risk.