Ideal Body Weight Calculator

Enter your height and gender to calculate your ideal body weight across four clinical formulas and see the consensus average.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter Your Height
Input your total height in inches (e.g., 70 for 5ft 10in). This is the primary input for all formulas.
2
Select Your Gender
Choose 'Male' or 'Female' to apply gender-specific calculations, as ideal body weight formulas vary by sex.
3
Review Ideal Weight Averages
Examine the average ideal weight, individual formula results, and the spread between them to understand your healthy weight range.

Example Calculation

An adult male, 5ft 10in tall, wants to determine his ideal body weight across various common formulas.

Height

70 in

Gender

Male

Results

159.2 lbs

Tips

Consider Body Composition Beyond IBW

While IBW formulas are useful, they don't account for body composition. Highly muscular individuals may weigh more than their IBW but still be healthy. Focus on body fat percentage and overall fitness in addition to weight.

Use the Average as a Guidepost

If the different formulas provide a wide range of results, consider the average ideal weight as a general guide. It represents a consensus and can be a good starting point for discussions with healthcare professionals.

Healthy Range Allows for Variation

Remember that ideal body weight is not a single number. A healthy weight range often allows for a ±10% variation around the calculated ideal, accommodating individual differences in body frame and muscle mass.

Unlocking Your Healthy Weight Potential: The Ideal Body Weight Calculator

The Ideal Body Weight Calculator provides a comprehensive assessment of a healthy weight range by leveraging several widely recognized formulas: Devine, Robinson, Miller, and Hamwi. This tool helps individuals understand where their weight might ideally fall based on height and gender, offering an average and highlighting the spread between different calculations. For many adults, maintaining a weight within a healthy range, typically a BMI of 18.5 to 24.9 kg/m², is a key indicator of overall well-being in 2025, reducing risks for chronic diseases.

Interpreting Ideal Body Weight in a Health Context

Ideal Body Weight (IBW) is a reference point that clinicians use in various settings, particularly for medication dosing or ventilator settings, where an individual's actual weight, especially in cases of obesity or severe underweight, can be misleading. While formulas provide a numerical reference, a healthy weight range typically allows for a ±10% variation around the calculated ideal, accommodating individual differences in body frame and muscle mass. Body Mass Index (BMI) is another common metric, with a 'normal' range of 18.5 to 24.9 kg/m² for adults; however, BMI doesn't account for body composition, meaning a very muscular individual might have a high BMI without being overfat.

The Formulas Behind Ideal Body Weight Calculation

This calculator synthesizes four distinct formulas to provide a well-rounded estimate of ideal body weight. Each formula uses a baseline weight for a 5-foot individual and adds a specific increment for every inch over 5 feet, adjusted by gender.

For Males:

Devine: 110 lbs + (5.06 lbs/inch × inches over 5 ft)
Robinson: 114.4 lbs + (4.18 lbs/inch × inches over 5 ft)
Miller: 123.2 lbs + (3.06 lbs/inch × inches over 5 ft)
Hamwi: 106 lbs + (6 lbs/inch × inches over 5 ft)

For Females:

Devine: 100 lbs + (5.06 lbs/inch × inches over 5 ft)
Robinson: 108.46 lbs + (3.7 lbs/inch × inches over 5 ft)
Miller: 115.5 lbs + (2.84 lbs/inch × inches over 5 ft)
Hamwi: 100 lbs + (5 lbs/inch × inches over 5 ft)

The calculator then averages these results to provide a consensus.

💡 For specific clinical applications, such as medication dosing, our PCA (Patient-Controlled Analgesia) Dose Calculator often relies on ideal body weight for accurate calculations.

Determining Ideal Weight for a 5ft 10in Male

Let's illustrate with an adult male who stands 5 feet 10 inches tall:

Height: 70 inches (5ft 10in)
Gender: Male

The calculator applies the male-specific formulas using 10 inches over 5 feet:

Devine Formula: 110 + (5.06 × 10) = 160.6 lbs
Robinson Formula: 114.4 + (4.18 × 10) = 156.2 lbs
Miller Formula: 123.2 + (3.06 × 10) = 153.8 lbs
Hamwi Formula: 106 + (6 × 10) = 166.0 lbs

The Average Ideal Weight is then calculated as (160.6 + 156.2 + 153.8 + 166.0) / 4 = 159.2 lbs. The spread between the highest (Hamwi) and lowest (Miller) estimates is 12.2 lbs, indicating a moderate variation between formulas but still providing a useful range for health assessment.

💡 In clinical settings, ideal body weight helps assess overall health status. Similarly, the PEWS (Pediatric Early Warning Score) Calculator provides a rapid assessment of pediatric patient stability.

Interpreting Ideal Body Weight in a Health Context

Clinical Guidelines and Ideal Body Weight

While ideal body weight (IBW) formulas are not "regulatory" standards in the same way as BMI classifications from the CDC or WHO, they are standard calculations commonly referenced in clinical practice. The Devine formula, for example, is frequently used in pharmacology to adjust drug dosages, especially for medications that are highly lipid-soluble or renally cleared. Using IBW rather than actual body weight in obese patients can prevent overdosing, ensuring patient safety and therapeutic efficacy. Similarly, IBW is applied in critical care for ventilator settings and in nutrition support to estimate caloric needs. These calculations serve as essential tools for healthcare professionals, guiding precise medical decisions and supporting patient care, always emphasizing the need for professional medical consultation.

Frequently Asked Questions

Why are there different ideal body weight formulas?

Various ideal body weight (IBW) formulas exist because researchers have used different methodologies and populations to derive them, often with specific applications in mind. Formulas like Devine, Robinson, Miller, and Hamwi each offer slightly different estimates based on height and gender, reflecting the complexity of defining an 'ideal' weight, which can vary based on body frame, muscle mass, and clinical purpose.

How is ideal body weight different from BMI?

Ideal Body Weight (IBW) is a target weight derived from formulas based on height and gender, suggesting a healthy weight for a given stature. Body Mass Index (BMI), on the other hand, is a ratio of weight to height squared, categorizing individuals into underweight, normal, overweight, or obese ranges. While both assess weight, IBW provides a specific target, whereas BMI offers a broader health category.

Can ideal body weight formulas be used for all body types?

Ideal body weight formulas provide a useful reference point but have limitations, especially for individuals with very muscular builds or significant body fat. They do not account for body composition, meaning a very athletic person might exceed their calculated IBW due to muscle mass, while still being healthy. Healthcare professionals often use IBW alongside other metrics like body fat percentage and waist circumference.

What is a healthy weight range around my ideal body weight?

A healthy weight range is typically considered to be within 10% above or below your calculated ideal body weight (IBW). This buffer accounts for individual variations in body frame, muscle mass, and hydration. For example, if your IBW is 150 lbs, a range of 135-165 lbs might be considered healthy, though personal factors and medical advice should always be considered.