Ideal Weight Calculator

📘 How to Use the Ideal Weight Calculator

1. Select the sex category used by the historical formulas.
2. Enter your adult height in centimeters.
3. Select Compare Formulas.
4. Review the Devine, Robinson and Miller results separately.
5. Use the displayed average only as a summary of those three outputs.

The calculator is intended to make these older height-based formulas easy to compare. It does not determine an individual’s medically appropriate body weight.

3 Which Formulas Does ToolZippy Compare?

This calculator compares three commonly cited historical height-based formulas: Devine, Robinson and Miller. Each uses a base weight at 5 feet and then adds a specified amount for each inch above 5 feet.

D Devine Formula

The Devine formula is one historical approach to estimating a reference body weight from height and sex category. Like the other formulas on this page, it does not account for body composition or individual health circumstances.

R Robinson Formula

M Miller Formula

ƒ How the Calculation Works

ToolZippy first converts height from centimeters to inches. It then determines how many inches the entered height is above 5 feet, or 60 inches.

175 Worked Example at 175 cm

A height of 175 cm is approximately 68.9 inches, which is about 8.9 inches above 5 feet. Using the male constants, the three formulas produce somewhat different estimates because their base weights and per-inch adjustments differ.

≈ Why Do the Formula Results Differ?

The formulas were developed using different assumptions and coefficients. Therefore, the same height can produce different numbers depending on which equation is used.

That disagreement is one reason it is more informative to show the formulas separately rather than present one number as a precise or universally correct “ideal” weight.

AVG What Does the Average Mean?

ToolZippy also displays the arithmetic average of the Devine, Robinson and Miller results. This is included only as a convenient summary of the three calculations.

The average is not a separate clinical formula and should not be interpreted as a medically recommended target.

⚠ Important Limitations

Height alone cannot describe an individual’s overall health or body composition. These equations do not directly consider many factors that can matter when evaluating body weight.

• Body-fat percentage and lean mass
• Muscle development
• Bone structure and frame
• Age-related changes
• Pregnancy
• Medical conditions
• Medications
• Individual health goals and circumstances

BMI Ideal Weight Formula vs BMI

These are different calculations. The formulas on this page produce height-based reference weight estimates. BMI instead uses both current weight and height to calculate a body mass index.

You can use the BMI Calculator if you specifically want to calculate BMI from height and current weight.

% What About Body Composition?

Two adults can have the same height and weight while having different proportions of body fat and lean tissue. A simple height-based formula cannot distinguish between those differences.

For another type of general estimate, ToolZippy also provides a Body Fat Calculator. That tool has its own assumptions and limitations.

18+ Who Is This Calculator Intended For?

This page is designed as a general educational comparison of adult height-based formulas. It is not designed to establish weight targets for children, pregnancy, clinical treatment, eating-disorder management or other situations requiring individual professional assessment.

Health information notice: The term “ideal weight” is the conventional name used for these historical formulas; it does not mean the calculator can identify an ideal or medically appropriate weight for an individual. The results are general educational estimates and are not medical advice, diagnosis or treatment guidance. For individualized weight, nutrition or health decisions, consult an appropriately qualified healthcare professional.