Ideal Weight Calculator

Estimate a healthy weight range for your height, with classic ideal-weight formulas for comparison.

100% Browser-Based • Local Processing
Units
cm
kg

There is no single ideal weight. The healthy range comes from BMI 18.5–24.9; the named formulas below are 1960s–80s clinical rules of thumb, mostly built for medicine dosing, and each returns one number rather than a range. Not medical advice.

Healthy weight range at 180 cm

59.9–80.7 kg

Devine 1974 75.0 kg
Robinson 1983 72.6 kg
Miller 1983 71.5 kg
Hamwi 1964 77.3 kg
Formulas and working

The range

weight = BMI × height (m)², at BMI 18.5 and 24.9

Your numbers

18.5 × 1.80² = 59.9 kg and 24.9 × 1.80² = 80.7 kg. The four named formulas add 2.3 kg or so per inch of height above 5 ft to a base weight, which is why they disagree with each other by several kilos.

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🔒 Local Processing. Your numbers never leave your device.

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Overview

What is a Ideal Weight Calculator?

An Ideal Weight Calculator estimates a healthy weight range for your height. It derives the range from the normal BMI band (18.5–24.9) for your height, and also shows classic ideal-body-weight formulas (Devine, Robinson, Miller, Hamwi) for comparison. Because people differ, a range is more useful than a single number. It runs privately in your browser.

'What should I weigh?' has no single right answer — but a healthy range for your height is a useful guide. The most practical version comes from the normal-BMI band; older clinical formulas give single 'ideal' figures that often disagree.

This calculator shows the healthy range and the classic formulas side by side, so you see a sensible window rather than one arbitrary number. It runs entirely in your browser, so your details stay private.

Guide

How to find your ideal weight

Step 1: Choose your sex and units, and enter your height

Choose your sex and units, and enter your height.

Step 2: Read the healthy weight range for your height

Read the healthy weight range for your height.

Step 3: Compare the classic ideal-weight formulas if you want a single reference figure

Compare the classic ideal-weight formulas if you want a single reference figure.

Screens

Ideal Weight Calculator in action

Ideal Weight Calculator showing a healthy weight range in the browser.
Healthy range
Healthy weight range with classic ideal-weight formulas.
Formula comparison
Finding an ideal weight on a phone, no app installed.
Mobile (stacked)
Details

A range, not a magic number

The most meaningful 'ideal weight' is a range, not a point, because healthy weight depends on more than height. This calculator derives the range from the normal BMI band: it finds the weights that give a BMI of 18.5 and 24.9 for your height, which brackets the healthy window. It also shows several classic ideal-body-weight (IBW) formulas — Devine, Robinson, Miller, and Hamwi — which were developed mainly for medical dosing and give a single figure based on height and sex; notably, they often disagree with each other by several kilograms, which itself shows there's no one true number. The honest framing matters here: these methods use only height and sex (and the BMI range, only height), so they ignore body composition (muscle weighs more than fat), frame size, age, and individual health — a fit, muscular person can sit above an 'ideal' figure and be perfectly healthy. So treat the range as a general guide for orientation, look at how you feel and other measures like body-fat percentage and waist size, and consult a healthcare professional for a personal target. It isn't medical advice. Everything computes locally. See also the BMI and Body Fat calculators.

Support

Frequently Asked Questions

How is a healthy weight range calculated?

From the normal BMI band for your height: the calculator finds the weights that correspond to a BMI of 18.5 (lower bound) and 24.9 (upper bound) for your height. That range is widely used as the healthy window. It's more useful than a single 'ideal' figure because healthy weight isn't one number.

What are the Devine, Robinson, and Hamwi formulas?

They're classic ideal-body-weight formulas, originally created to help calculate medication doses, that estimate a single weight from height and sex. Devine is the most cited; Robinson, Miller, and Hamwi are variations. They often give somewhat different answers, which is why the calculator shows them together — and why a range is more practical.

Why is there no single ideal weight?

Because weight depends on far more than height — muscle mass, frame size, age, body composition, and individual health all matter. Two people of the same height can both be healthy at quite different weights. The formulas use only height and sex, so they can't capture this, making a range and other measures more meaningful.

Does this account for muscle?

No — neither the BMI-based range nor the classic formulas distinguish muscle from fat, since they use only height (and sex). A muscular, fit person may weigh above the 'ideal' range yet have low body fat and good health. Pair this with a body-fat estimate for a truer picture of body composition.

Should I aim for the exact ideal weight number?

No. Aim to be within the healthy range and, more importantly, to feel well and have good body composition and fitness. The single 'ideal' figures are rough references, not targets to hit precisely. Chasing an exact number can be counterproductive; a sensible range and overall health matter more.

Is this medical advice?

No. It's a general estimate from height-based methods that ignore your body composition and individual health, and the formulas disagree. Use it for orientation, not as a personal prescription. For a weight goal tailored to you, consult a doctor or dietitian who can consider your full health picture.

Is it free, and do I need to sign up?

Yes, it's completely free with no account, no trial, and no limit on how many times you use it. It runs entirely in your browser, so there's no sign-in wall — just open the page and calculate.

Is my data private?

Yes. Everything is calculated in your browser — the numbers you enter are never sent to a server, and nothing is stored once you close the tab. That keeps any personal figures (salary, loan, health) on your own device.

Does it work on mobile?

Yes. It runs in your phone's browser with nothing to install, so you can calculate on Android or iOS. The layout adapts to small screens, so entering numbers and reading the result is easy on the go.

Does it work offline?

Once the page has loaded, the calculation runs entirely on your device, so it keeps working without a connection. You only need to be online to open the page the first time — which is also why nothing you enter is uploaded.

Can I copy or share the result?

Yes. You can copy the result to your clipboard with one click, and many results can be shared. Because everything is calculated locally, copying is instant with no upload step.

How accurate is it, and is this professional advice?

The math is accurate for the inputs you give, and the formula is shown so you can verify it. But results are estimates for general use, not professional advice — finance calculators use simplified assumptions and ignore fees and rate changes, and health calculators are general estimates, not medical advice. For important decisions, consult a qualified professional.

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