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Specialized Use Case

BMI Calculator for Weight Gain Goals

Looking to build mass or recover from being underweight? Tweak heights and weights to discover healthy BMI zones. Calculate the exact pounds or kilograms needed to achieve your fitness and nutritional targets.

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BMI Range Chart

Standard World Health Organization (WHO) categories

CategoryRange
Underweight		< 18.5
Normal weight		18.5 – 24.9
Overweight		25.0 – 29.9
Obese Class I		30.0 – 34.9
Obese Class II		35.0 – 39.9
Obese Class III		≥ 40.0

This chart applies to adults aged 20 years and older. For children and teens, BMI is interpreted differently using age and sex-specific percentiles.

Did you know?

Maintaining a healthy weight is important for overall health. In addition to BMI, healthcare providers use other measurements and factors - such as skinfold thickness, waist circumference, and diet - to assess a person’s health status.

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Professional Tips & Best Practices

1

Caloric surplus: Couple strength training with nutritional, calorie-dense foods for muscle gains.

2

Gradual progress: Target a steady weight gain of 0.5 to 1 pound per week to build mass safely.

3

Healthy ranges: Standard guidelines target a minimum BMI score of 18.5 to maintain energy levels.