Ideal Body Weight Calculator — Free IBW Calculator Online

Ideal Body Weight Calculator — Free IBW Calculator Online. Free ideal body weight calculator. Instantly compute your IBW using Devine, Robinson, Miller, and Hamwi formulas. Supports metric (cm/kg) and imperial (in/lb). 100% private — runs in your browser.

Our free ideal body weight calculator instantly computes your IBW using four validated scientific formulas — Devine, Robinson, Miller, and Hamwi. Enter your height and gender to get precise ibw calculator results in both metric (kg) and imperial (lbs).

Ideal for healthcare professionals, fitness coaches, and anyone tracking healthy weight goals. This ideal weight calculator runs entirely in your browser — your personal health data is never sent to any server.

Use it alongside our BMI Calculator, BMR Calculator, and Body Fat Percentage Calculator for a complete health assessment. All calculations are instant, free, and 100% private.

Frequently asked questions

How do I calculate my ideal body weight?

Choose Metric (cm/kg) or Imperial (in/lb), select Male or Female and enter your height in centimetres or inches. The calculator shows the Average (IBW) and the result of each of the four formulas in kg or lbs.

Which ideal weight formulas does the IBW calculator use?

Four published formulas based on height over 5 feet: Robinson (1983), Miller (1983), Devine (1974) and Hamwi (1964). For example, Devine gives 50 kg for men and 45.5 kg for women at 5 feet, plus 2.3 kg per extra inch. The average of the four is shown on top.

Why does it say my height must be at least 152cm?

All four formulas add weight per inch above 5 feet (152.4 cm or 60 inches), so they are not defined for shorter heights and no result is shown. In Imperial mode enter your total height in inches, for example 69 for 5 ft 9 in.

Is the ideal weight result medical advice?

No. The results are statistical estimates based only on height and gender and ignore age, muscle mass, frame size and body composition. Use them as a rough reference and ask a doctor or dietitian about a healthy weight for you.

Why do the formulas give different ideal weights?

Each formula was derived from different data and for different purposes; Devine, for example, was created to help dose medication. Their results can differ by several kilograms, which is why the calculator also shows their average.

How to use this online tool

Ideal Body Weight Calculator — Free IBW Calculator Online is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.

Private processing in your browser

Ideal Body Weight Calculator — Free IBW Calculator Online keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.

When this tool is useful

Use Ideal Body Weight Calculator — Free IBW Calculator Online for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.

Practical tips

Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.