Ideal Body
Weight Calculator
Find your ideal weight range based on clinical formulas. We use the Devine, Robinson, and Miller equations to provide a comprehensive view of your target healthy weight.
Results are shown in kg. These formulas are estimates based on height and gender.
How Is Ideal Weight Calculated?
There is no single “perfect” weight for everyone, but clinical formulas provide a healthy target range based on your height and biological sex. Our calculator uses the three most widely recognized formulas in medicine and nutrition:
- The Devine Formula: The most common formula used in clinical settings to determine drug dosages.
- The Robinson Formula: A modification of Devine’s formula intended to be more accurate for modern populations.
- The Miller Formula: Often considered more accurate for individuals with smaller frames.
Why Your Ideal Weight Matters
Maintaining a weight within your ideal range reduces the risk of chronic conditions such as Type 2 diabetes, cardiovascular disease, and hypertension. However, it’s important to remember that these formulas do not account for muscle mass or body fat percentage. Weight Loss Percentage Calculator provides a related tool.
Which Formula Should You Trust?
For most people, the Average Ideal Weight provided by our calculator is the best starting point. Athletes or those with significant muscle mass may find that their “ideal” weight is higher than these formulas suggest, as muscle is denser than fat.
How to Use This Tool
Simply enter your height and gender. The tool will instantly calculate your targets using all three formulas. We recommend aiming for a range within 5-10% of these results for a sustainable, healthy lifestyle.
Using the estimate well
Understanding Your Ideal Weight Result
Ideal-weight formulas were developed as broad reference equations, often for historical clinical or insurance use. They do not identify one correct weight for an individual.
Online calculators simplify real life into a small number of inputs. Use this result as a transparent estimate that you can review, not as proof that a particular outcome will occur. Target Weight Date Calculator provides a related tool.
Enter consistent information
Enter height and the requested sex category, then compare the different formulas rather than treating one output as exact. Most do not include age, ethnicity, body composition, disability or athletic build.
Before saving the answer, check the units, decimal points and assumptions shown by the tool. If you compare results later, use the same method so the trend is meaningful.
Interpret the number in context
The spread between formulas is a reminder that ‘ideal’ is not a precise biological value. Health can improve without reaching a calculated number, and people at the same weight can have different risks and abilities.
Avoid using this result to support crash dieting or appearance-based comparison. A suitable target should consider medical history, sustainable behaviour, strength, energy and relevant clinical measures.
A practical next step
Use the range only as background for a discussion with a qualified professional, especially if weight concerns affect eating, mood or health.
- Save the inputs with the date instead of recording only the final number.
- Look for a repeatable trend and avoid reacting to one unusually high or low result.
- Use qualified medical or coaching support when the decision affects health, treatment or safety.
Common questions
Is the result exact? No. It is the output of the displayed formula and the information entered. Measurement error and individual variation still apply.
How often should it be recalculated? Recalculate when the underlying inputs meaningfully change. Repeating it several times a day usually adds noise rather than useful information.
Can it replace professional advice? No. It is an educational planning aid and cannot assess symptoms, diagnose a condition or account for a complete personal history.