Ideal Body Weight Calculator

Ideal Body Weight (IBW) is a clinical measure used to estimate the optimal weight for an individual based on their height and gender. IBW provides a specific target weight commonly used in medical settings for medication dosing, nutritional assessments, and health evaluations.

Enter your details below to find your ideal body weight

Sex

Height

Ideal Body Weight

lbs (-- kg)

Healthy range (±10%)

What is Ideal Body Weight?

Ideal Body Weight (IBW) is a clinical estimate — not a personal goal — used by healthcare providers for tasks like medication dosing and nutritional assessments. It gives a single reference weight based only on height and biological sex.

Because IBW doesn't account for muscle mass, frame size, or body composition, most people's healthy weight actually spans a range around it rather than one exact number.

How is Ideal Body Weight calculated?

This calculator uses the Devine formula, the most widely used IBW equation in clinical settings. It starts from a base weight at 5 feet tall and adds a fixed amount for every inch above that.

Formula (Devine)

Men: 50 kg + 2.3 kg per inch over 5 ft

Women: 45.5 kg + 2.3 kg per inch over 5 ft

Example: Woman, 5’5" → 45.5 + 2.3 × 5 ≈ 57 kg (≈ 126 lb)

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Reviewed by

Rachel Matthews, MS, RD, CSSD

Rachel is a registered dietitian and board-certified specialist in sports dietetics with over 15 years of experience in clinical and fitness settings. She works with both athletes and individuals pursuing weight management goals, tailoring nutrition plans to support medication-assisted weight loss. Rachel has authored numerous nutrition education materials and brings an evidence-based yet practical perspective to fitness and dietary guidance.