Ideal Weight Calculator

Written by Great Medico

Updated September 24, 2026 •2 min read

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A tape measure or scale can produce plenty of numbers; the useful part is knowing what relationship you are actually looking at. Ideal Weight Calculator keeps that question narrow and visible.

What this calculator does

“Ideal weight” is not a single biological truth, so this calculator deliberately shows several established height-based estimates instead of pretending there is one perfect number. Anthropometric equations are convenient because they use simple measurements, but they describe body size or proportion rather than directly measuring tissue composition or health.

How to use it

Enter or select Sex, Height, and Current weight. Use the units offered by the calculator and keep measurements consistent when you plan to compare results over time.

How the calculation works

The main estimate uses the Peterson formula, while the result panel also compares Miller, Robinson, Devine, Hamwi, Broca, Lorentz, and the weight range corresponding to the calculator’s healthy-BMI interval. Sex is used where a formula is sex-specific.

Example

For the sample values prefilled in this calculator, the primary result is 67.65 kg (Peterson ideal body weight), Miller is 68.7 kg, and Robinson is 68.9 kg. This example is there to show how the inputs flow through the implemented equation; replace the sample values with your own measurements before using the result.

How to interpret the result

Look at the spread across methods rather than focusing on one exact kilogram or pound value. The entered current weight is useful context, but it does not change the height-based ideal-weight equations themselves.

Limitations and notes

These equations do not account directly for muscle mass, frame size, pregnancy, edema, age-related body-composition change, or an individual medical goal. A clinically appropriate target weight may therefore sit outside the formula estimates. For repeat measurements, consistency usually matters more than false precision: use the same unit system, the same tape or scale when possible, and the same anatomical landmarks. A small change near a category boundary should be viewed in context rather than treated as a sudden biological change.