Does ideal weight change with age?

The formulas themselves don't adjust for age, but body composition naturally changes over time. Older adults tend to lose muscle and gain fat even at the same weight, so what's 'ideal' in a health sense shifts somewhat with age. That’s something important to keep in mind when you look at results.

What if I'm very muscular, will the calculator still apply?

Not perfectly. These formulas were built on average body types and don't account for high muscle mass. For example, the calculator might say a 5'10" bodybuilder 'ideally' weighs 165 lbs, but their actual healthy weight could be significantly higher. In that case, body fat percentage is a better metric.

Is my ideal weight the same as my goal weight

Not necessarily. Ideal weight is a health-based estimate. Your actual goal weight might be a bit different based on your build, your muscle goals or how you feel. The range of the calculator is a guide, not a target.

Why do the different formulas disagree so much?

Because each was built for a different purpose and population. Devine was designed for medication dosing, not health; Hamwi and Robinson came from different reference groups decades apart. The spread between them is the honest answer: ideal weight is a range, not a single number.

Ideal Weight Calculator

Find your ideal body weight using four established formulas

Ideal Weight Results

Average Ideal Weight

Mean of all four formulas

70 kg

154.3 lbs

Robinson (1983)

Based on body frame size and height adjustments

68.9 kg

151.9 lbs

Miller (1983)

Tends to give slightly lower estimates

68.7 kg

151.5 lbs

Devine (1974)

Originally used in pharmacology for drug dosing

70.5 kg

155.4 lbs

Hamwi (1964)

Based on medium frame; adjust ±10% for frame size

72 kg

158.7 lbs

Healthy BMI Range (18.5–24.9)

Minimum (BMI 18.5)

56.7 kg / 125 lbs

—

Maximum (BMI 24.9)

76.3 kg / 168.2 lbs

What is the Ideal Weight Calculator?

The ideal weight calculator estimates a healthy weight range for your height and gender. It is not trying to tell you what you should weigh for looks; it's based on formulas developed by medical researchers to estimate the weight at which most people perform well medically. Doctors, dietitians, and people setting realistic fitness goals use it. CalciHub's version runs 4 well-known formulas at once and shows you the range so you can see where the science actually lands for your body.

How does a metric work?

CalciHub calculates ideal weight at the same time using four well-established medical formulas.

Robinson Formula: (Male) 52 kg + 1.9 kg for every inch over 5 feet; (Female) 49 kg + 1.7 kg for every inch over 5 feet Miller Formula: 56.2 kg + 1.41 kg/inch over 5' (male); 53.1 kg + 1.36 kg/inch over 5' (female) Devine Formula Men: 50 kg + 2.3 kg per inch over 5 feet Women: 45.5 kg + 2.3 kg per inch over 5 feet Hamwi Formula: 48 kg + 2.7 kg per inch over 5 feet (men) 45.4 kg + 2.26 kg per inch over 5 feet (women)

Height = your height in feet and inches; gender = affects base weight in each formula

How to Use CalciHub's Ideal Weight Calculator

1. Choose your unit system: select Metric or Imperial.

2. Select your gender. Choose Male or Female.

2. Enter your height in feet and inches (or centimetres).

3. Click “Calculate”

4. Review the results from all four formulas and the average range.

5. Compare your current weight to the suggested range.

Tip: The range across 4 formulas is more useful than any single number. If your current weight falls within that range, you're likely in good shape regardless of which formula you trust most.

How It Works with a Real Example

David is 5'11" and wants to know what a healthy weight looks like for him. He enters his details into CalciHub's ideal weight calculator.

Gender: Male | Height: 5'11"

Results: Robinson: 74.3 kg (163.8 lbs) Miller: 75.6 kg (166.7 lbs) Devine: 80 kg (176.4 lbs) Hamwi: 79.4 kg (175.1 lbs) Average range: roughly 165–177 lbs

David currently weighs 182 lbs. He's just a little bit out of range, but not by much. He uses the result to set a realistic target weight rather than a vague "I want to lose weight" goal.

Frequently Asked Questions

There is no one “best” formula; each was designed for a different population or purpose. The Devine formula is the most commonly used in clinical settings, but looking at the range across all four gives a more balanced picture than relying on any one calculation.

Before you rely on this result

The formulas here were built for different purposes — Devine was designed for medication dosing, not health — and they disagree with each other by several kilograms. That spread is the honest answer: healthy weight is a range that depends on your build, muscle mass and history, not a single target.

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