Normal BMI: the healthy range for adults
Learn the standard healthy adult BMI range, how boundary values are classified and what the number leaves out.
For most adults, a BMI from 18.5 through 24.9 is classified as the healthy-weight range. Below 18.5 is underweight, 25.0–29.9 is overweight and 30.0 or above is obesity.
There is no universally “best” number inside the range. A BMI of 20, 22 or 24 can all fall within it, and the most appropriate weight depends on the individual’s build, muscle, weight history and health.
At boundaries, calculate before rounding. An exact value of 24.96 is below 25, even though a whole-number display could show 25. A calculator that preserves decimals prevents this ambiguity.
A healthy-range BMI does not prove that body composition, blood pressure, blood glucose or fitness is healthy. Likewise, a value just outside the range does not diagnose a disease. BMI is best treated as one screening measure alongside waist size, clinical markers and personal context.
Use the BMI calculator for your exact result. These adult cutoffs do not apply to children or teenagers, and pregnancy requires different interpretation.