BMI vs Body Fat Percentage: Which Matters?

BMI is fast. Body fat is personal.

BMI uses height and weight to estimate weight category. It’s quick, but it can’t see muscle vs fat. Body fat percentage is closer to the thing most people care about, but it’s harder to measure.

Use BMI when

• You want a quick screening number
• You’re comparing population-level data

Use body fat when

• You want a personal progress marker
• You’re recomping (scale stable, shape changes)

Try both: BMI Calculator and Body Fat Calculator. Then use waist metrics to keep the story honest.