Health & Fitness Calculators
Ideal Weight Calculator
Compare common ideal-weight formulas with a healthy BMI range and clear estimate limitations.
US height units are selected by default. Switch to metric if needed.
Calculation assumptions
- *This page compares Devine, Robinson, Miller, and Hamwi formulas plus a healthy-BMI comparison range.
- *Ideal-weight formulas are rough height-based estimates and do not account for body composition, muscle mass, ethnicity, pregnancy, age-specific needs, medical conditions, medications, or individual health risk.
- *Use the result as general education context, not as a diagnosis or required target.
Enter your values and press Calculate.
Results and breakdowns will appear here after a valid calculation.
What is ideal body weight?
Ideal body weight is a simplified estimate based mainly on height and sex. It can be useful as a broad reference point, but it is not a medical diagnosis and it is not one correct weight for every person.
This calculator shows several common formulas because each formula uses different assumptions. The spread between them is often more useful than any single number.
How ideal weight formulas work
Devine, Robinson, Miller, and Hamwi are height-based formulas. They start with a base weight at 5 feet, then add a set number of kilograms for each inch above 5 feet.
Example Devine formula: men use 50 kg + 2.3 kg per inch over 5 feet, while women use 45.5 kg + 2.3 kg per inch over 5 feet.
Devine vs Robinson vs Miller vs Hamwi
These formulas can differ because their base weights and per-inch additions are not identical. Devine is commonly used as a benchmark, while Robinson, Miller, and Hamwi provide comparison points so the result does not look more precise than it really is.
Healthy BMI weight range
The healthy BMI range shown here uses adult BMI 18.5 to 24.9 as a screening-style comparison. BMI does not directly measure muscle, fat distribution, pregnancy status, or individual health risk, so it should be read alongside broader context.
Worked example
Example: for a 5 ft 10 in male, the Devine estimate is 50 + 2.3 x 10 = 73.0 kg, or about 160.9 lb. This is a rough benchmark, not one correct target weight.
Ideal weight vs BMI vs body fat percentage
Ideal-weight formulas estimate from height, BMI compares weight with height, and body fat percentage estimates body composition. For broader context, compare this page with the BMI Calculator, Body Fat Calculator, Calorie Calculator, Macro Calculator, Heart Rate Zones Calculator, and Health & Fitness Calculators.
Safety notes and common mistakes
Ideal-weight formulas are rough estimates for general education only, not medical advice, diagnosis, or treatment guidance.
- Do not treat one formula result as the only healthy weight.
- Do not ignore body frame, muscle mass, body composition, ethnicity, pregnancy, age, medications, or health status.
- Do not use the result to diagnose or manage a medical condition.
- People who are pregnant, under 18, older adults, athletes, or anyone with medical concerns should use professional guidance.
Transparency note
Accuracy and limitations
Calzivo tools are built for practical estimates, conversions, and checks. Some tools use standard formulas or simplified assumptions, and results can be affected by input accuracy, rounding, units, local rules, or changing official requirements.
Health and fitness results are estimates, not medical advice. Formulas simplify real bodies and cycles, so important health decisions should be checked with a qualified clinician.
How to Use This Tool
Use these steps to enter the right inputs and interpret the result correctly.
Select your gender.
Choose US or Metric units.
Enter your height in the matching unit system.
The calculator will show several formula estimates and a healthy-BMI comparison range.
Related Tools
Other helpful tools in the Health & Fitness Calculators category.
BMI Calculator
Calculate body mass index from height and weight, see the adult category, and understand screening limitations.
Calorie Calculator
Estimate BMR, TDEE, maintenance calories, and simple deficit or surplus planning targets.
Macro Calculator
Estimate daily protein, carbs, fat, calories, and macro split targets from body stats, goals, and activity.
Body Fat Calculator
Estimate body fat percentage with Navy circumference or BMI-based methods, reference ranges, and neutral context.
Heart Rate Zones Calculator
Calculate Zone 2, max-HR, and Karvonen heart-rate-reserve zones for general fitness planning.
Lean Body Mass
Estimate your lean body mass and body composition.
Related Guides
Background reading and explanations related to Ideal Weight Calculator.
BMI Limits: What BMI Can and Cannot Tell You
Understand BMI as a screening estimate and where body composition context matters.
BMI Explained (What It Means and When It Misleads You)
What your BMI score really means.
Ideal Weight Is an Estimate, Not a Diagnosis
Read ideal-weight formula results as rough context, not medical conclusions.
Frequently Asked Questions
Common questions about Ideal Weight Calculator and how to read the result.
Is this weight perfect for everyone?
No, 'ideal' weight is a statistical average. Factors like muscle mass, bone density, and body composition are not accounted for.
Which formula does this calculator use?
It compares Devine, Robinson, Miller, and Hamwi formulas and also shows a BMI-based comparison range.
Is ideal weight the same as a medical goal?
No. It is a rough estimate and should not be treated as medical advice, diagnosis, or treatment guidance.
Why does body composition matter?
Muscle, bone density, body frame, and fat distribution can make the same weight mean different things for different people.
Why do ideal-weight formulas give different answers?
They use different base weights and per-inch adjustments, so the range between formulas is often more useful than one exact number.
Is the BMI range a diagnosis?
No. BMI is a screening-style range based on height and weight. It does not directly measure body fat, muscle mass, or individual health risk.
Can athletes use this?
Athletes can use it as rough context, but formula estimates may not fit high muscle mass or unusual body composition well.
Who should use professional guidance?
People who are pregnant, under 18, older adults, athletes, or anyone with a medical condition should use professional guidance.