Ideal Body Weight (Devine) Calculator

What Is Ideal Body Weight (IBW)?

The Ideal Body Weight (IBW) Calculator estimates a person’s healthy body weight based on height and biological sex using the Devine Formula. Originally developed by Dr. Ben J. Devine in 1974, this formula remains one of the most widely used methods in hospitals, pharmacies, and healthcare settings.

Ideal Body Weight is frequently used in clinical medicine, anesthesia, critical care, nutrition, drug dosing, and mechanical ventilation. Unlike Body Mass Index (BMI), which assesses body fat based on weight and height, IBW estimates an appropriate body weight based primarily on height.

Our free online calculator provides instant results using the standard Devine Formula and is suitable for healthcare professionals, nursing students, pharmacists, physicians, dietitians, fitness professionals, and the general public.

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Devine Formula

Male

IBW = 50 + 2.3 × (Height in inches − 60)

Female

IBW = 45.5 + 2.3 × (Height in inches − 60)

The calculator automatically converts centimeters into inches before performing the calculation.

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How to Use This Calculator

1. Select your gender.

2. Enter your height in centimeters.

3. Click Calculate.

4. View your Ideal Body Weight instantly.

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Example

Male

Height: 175 cm

Result:

Ideal Body Weight = 70.5 kg

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Female

Height: 165 cm

Result:

Ideal Body Weight = 57.0 kg

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Clinical Uses of Ideal Body Weight

Healthcare professionals commonly use Ideal Body Weight for:

• Medication dose calculations

• Critical care medicine

• Mechanical ventilation settings

• Anesthesia drug calculations

• Nutritional assessment

• Weight management

• Clinical research

• Renal function calculations

• Obesity assessment

• Hospital patient management

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Advantages of the Devine Formula

• Easy to calculate

• Clinically validated

• Widely used worldwide

• Standard hospital formula

• Useful for adults

• Supports medication dosing

• Recommended in many clinical settings

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Ideal Body Weight vs Body Mass Index

Ideal Body Weight	Body Mass Index
Estimates healthy body weight	Estimates body fat category
Based mainly on height	Based on height and current weight
Used for drug dosing	Used for obesity screening
Expressed in kilograms	Expressed as kg/m²

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Who Should Use This Calculator?

This calculator is useful for:

• Doctors

• Nurses

• Pharmacists

• Dietitians

• Medical students

• Nursing students

• Fitness professionals

• Researchers

• Hospital staff

• General public

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Related Calculators

• Body Mass Index (BMI) Calculator

• Body Surface Area (Mosteller) Calculator

• Adjusted Body Weight Calculator

• Lean Body Weight Calculator

• Basal Metabolic Rate Calculator

• Daily Calorie Requirement Calculator

• Waist-to-Hip Ratio Calculator

• Body Fat Percentage Calculator

Frequently Asked Questions (FAQs)

1. What is an Ideal Body Weight (IBW) Calculator?

An Ideal Body Weight (IBW) Calculator estimates a person’s healthy body weight based on their height and biological sex. It is commonly used in hospitals, clinics, pharmacies, and nutrition practice for medication dosing, nutritional assessment, and clinical decision-making.

2. What is the Devine Formula?

The Devine Formula is a widely accepted equation developed by Dr. Ben J. Devine in 1974 to estimate ideal body weight in adults. It is one of the most commonly used formulas in medical practice.

3. How is Ideal Body Weight calculated?

The Devine Formula is used:

• Male: IBW = 50 + 2.3 × (Height in inches − 60)

• Female: IBW = 45.5 + 2.3 × (Height in inches − 60)

The calculator automatically converts centimeters into inches before performing the calculation.

4. Is the Ideal Body Weight Calculator accurate?

The calculator accurately applies the Devine Formula when you enter the correct height and gender. However, it provides an estimate and does not account for factors such as muscle mass, body composition, or individual health conditions.

5. Why do healthcare professionals use Ideal Body Weight?

Ideal Body Weight is commonly used for:

• Medication dosing

• Chemotherapy calculations

• Anesthesia planning

• Mechanical ventilation settings

• Nutritional assessment

• Critical care management

• Kidney function evaluation

6. What is the difference between Ideal Body Weight and BMI?

Ideal Body Weight estimates an appropriate body weight based on height and sex, whereas Body Mass Index (BMI) classifies weight into categories such as underweight, normal weight, overweight, and obesity based on height and current weight.

7. Can women use the Devine Formula?

Yes. The calculator automatically applies the female version of the Devine Formula when “Female” is selected.

8. Can children use this calculator?

The Devine Formula was developed for adults. Pediatric patients are usually assessed using age-specific growth charts and pediatric weight formulas.

9. What units does this calculator use?

The calculator accepts:

• Height in centimeters (cm)

• Result in kilograms (kg)

10. Is Ideal Body Weight the same as healthy body weight?

Not always. Ideal Body Weight is a clinical estimate. A healthy body weight depends on many factors, including age, body composition, muscle mass, overall health, and lifestyle.

11. Can athletes rely on the Ideal Body Weight Calculator?

Athletes often have greater muscle mass than the general population. The Devine Formula may underestimate their appropriate body weight, so results should be interpreted with caution.

12. Is this calculator suitable for weight-loss planning?

The calculator can provide a useful reference point, but weight-loss goals should be individualized and discussed with a qualified healthcare professional or registered dietitian.

13. Which healthcare professionals commonly use the Devine Formula?

The Devine Formula is frequently used by:

• Doctors

• Nurses

• Pharmacists

• Dietitians

• Anesthesiologists

• Critical care specialists

• Medical students

• Nursing students

14. Does Ideal Body Weight change with age?

The Devine Formula does not directly include age. It estimates ideal body weight primarily from height and biological sex.

15. Is this calculator free to use?

Yes. This Ideal Body Weight (Devine) Calculator is completely free and can be used for educational, clinical, and informational purposes.

Medical Disclaimer

This calculator is intended for educational and informational purposes only. It should not replace professional medical advice, diagnosis, or treatment. Healthcare decisions should always be made in consultation with qualified medical professionals.