Ideal Weight Calculator — Free Online Tool
Find your ideal weight range using 4 medical formulas. · No signup · Works on mobile
100% private: your data is processed in your browser. Nothing is uploaded to our servers.
How to use the ideal weight calculator
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1
Select your biological sex and enter your height (cm or ft/in).
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2
Optionally add your current weight to see how far you are from the range.
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3
Compare the four formula results and the healthy BMI weight range.
What does this tool do?
This free ideal weight calculator estimates a healthy weight for your height and sex using four established medical formulas — Devine, Robinson, Miller, and Hamwi — alongside the WHO healthy BMI range. Comparing all five gives a realistic target range rather than a single misleading number.
How does the ideal weight calculator work?
Each formula sets a base weight for 5 feet of height plus an increment per extra inch. The Devine formula (men: 50 kg + 2.3 kg/inch over 5 ft) is the standard used for medication dosing. The tool also shows the BMI 18.5–24.9 weight range, which many clinicians consider more useful.
Frequently Asked Questions
Why do the four formulas give different ideal weights?
Each was derived from different populations and eras — Hamwi (1964) for quick clinical estimates, Devine (1974) for drug dosing, Robinson and Miller (1983) as refinements. For a 5'10" man they range from about 71 to 75.5 kg. Treat the spread as a healthy zone, not a single target.
Is ideal weight the same as healthy weight?
Not exactly. Formula "ideal weights" are statistical conveniences; health depends more on body composition, waist circumference (under half your height is a good rule), blood markers, and fitness. A muscular person can be perfectly healthy above every formula's number.
Is the ideal weight calculator really free?
Yes — 100% free with no hidden charges, trial limits, or premium tiers for core features. You don't need to create an account or enter an email address. The site is supported by non-intrusive display ads, which keeps every tool free for everyone.
Is my data private when using the ideal weight calculator?
Completely. The ideal weight calculator runs entirely in your browser using JavaScript — nothing you type or upload is sent to our servers. When you close the tab, your data is gone. This makes it safe for confidential documents, financial figures, and personal information.
Does the ideal weight calculator work on mobile phones?
Yes. The ideal weight calculator is built mobile-first and works on any phone or tablet with a modern browser — iPhone (Safari), Android (Chrome), and everything in between. The layout adapts to small screens, so buttons and inputs stay easy to tap on a 375px-wide display.
Do I need to install anything to use the ideal weight calculator?
No. The ideal weight calculator works directly in your web browser — no downloads, no extensions, no signup. Just open the page, use the tool, and get your result instantly. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.