Free Ideal Weight Calculator
Estimate an adult ideal body weight range using several established height-based formulas. Instead of presenting one number as the truth, this calculator compares multiple formulas so you can see how much estimates vary and why a healthy weight range is more useful than a single target.
Formulas Used
The formulas on this page were originally designed for clinical reference and medication dosing, not for judging appearance or personal worth. They use height and sex-based constants, which makes them simple but limited.
- Devine: Often referenced for medication dosing calculations and historical ideal body weight estimates.
- Robinson: A revised formula that tends to produce slightly different estimates from Devine.
- Miller: Another adult ideal body weight formula with adjusted base values.
- Hamwi: A long-standing rule-of-thumb formula still found in many clinical references.
How to Interpret the Result
- Look at the spread between formulas instead of focusing only on the average.
- Compare the result with other context such as BMI, waist measurement, strength, lab results, and how you feel day to day.
- Use the estimate as a rough reference for planning conversations with a clinician, trainer, or dietitian.
- Avoid using the result as a strict goal if you are still growing, pregnant, highly muscular, older, or managing a medical condition.
Why Results Can Differ
Ideal-weight formulas do not measure body composition. Two people with the same height can have very different muscle mass, bone density, body frame, and health status. Athletes may weigh more than a formula suggests and still be healthy. Older adults may need different goals than younger adults. This is why the calculator is best used as a broad reference.
Privacy and Health Disclaimer
Your height and sex selection are processed locally in your browser and are not uploaded. This calculator is for general information only. For personal weight goals, especially if you have a medical condition or history of disordered eating, speak with a qualified healthcare professional.
Last Reviewed and Medical Notes
Last reviewed: July 2026. Ideal-weight formulas are broad estimates and were not designed to define personal worth, appearance goals, or diagnosis. They can be misleading for athletes, older adults, pregnant people, adolescents, and people with medical conditions that affect body composition or fluid balance.
Quick Answer
Use this calculator to compare several historical adult ideal-weight formulas, not to set a strict target. A healthy range depends on body composition, medical history, lifestyle, and clinician guidance.