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Ideal Weight Calculator

Devine, Robinson and Miller ideal weight estimates.

Losing weightStep 5 of 5

Best for: Use it to set a sensible goal weight for your height.

Complete guide
See benchmark ranges Why this result happened View assumptions
Country (units):

Input

How it's calculated & sources
The Ideal Weight Calculator uses the standard formula for this calculation. It runs entirely in your browser, so your inputs are never uploaded. Figures are educational estimates, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.
Key assumptions
  • Classic medical formulas (Devine, Robinson, etc.)
  • A range, not a single target

Educational estimate only — not medical advice. Consult a qualified healthcare professional for decisions about your health.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Devine: Men 50 + 2.3·(in over 5 ft) · Women 45.5 + 2.3·(in over 5 ft)

Robinson: Men 52 + 1.9·in · Women 49 + 1.7·in

Example

Male, 175 cm (≈68.9 in, 8.9 in over 5 ft) → Devine ≈ 70.5 kg.

Frequently asked questions

Which formula is best?+

There is no single 'ideal'. Use these as a starting range, not a target.

Continue your journey

Where people usually head next.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Ideal Weight?
An ideal-weight calculator estimates a healthy target weight for your height and sex using the classic medical formulas, plus the healthy-BMI range.
Why does Ideal Weight matter?
It is paired with weight to judge healthy ranges and body composition.
How is Ideal Weight calculated?
It computes several established formulas (Robinson, Miller, Devine, Hamwi) side by side, since no single one is definitive, and shows the healthy-BMI weight range. Formula: e.g. Devine: men 50 kg + 2.3 kg per inch over 5 ft; women 45.5 kg + 2.3 kg per inch over 5 ft.
What is a good ideal weight?
18.5-24.9 (healthy range)
What are common ideal weight mistakes?
Using BMI for athletes or very muscular people
When should you use the Ideal Weight Calculator?
Use it to set a sensible goal weight for your height.

What is the Ideal Weight Calculator?

An ideal-weight calculator estimates a healthy target weight for your height and sex using the classic medical formulas, plus the healthy-BMI range.

How the Ideal Weight Calculator works

It computes several established formulas (Robinson, Miller, Devine, Hamwi) side by side, since no single one is definitive, and shows the healthy-BMI weight range.

e.g. Devine: men 50 kg + 2.3 kg per inch over 5 ft; women 45.5 kg + 2.3 kg per inch over 5 ft
  • height — Your height
  • sex — Adjusts the base weight
  1. Enter your height — your height, entered in centimeters/meters or feet and inches.
  2. Enter your weight — your body weight, entered in kilograms or pounds.
  3. Enter your target weight — the weight you are aiming to reach.
  4. Read the result, then change any input to compare scenarios instantly — the Ideal Weight Calculator recalculates as you type.

Understanding the inputs

What each value means, why it matters, and a typical range — so you can fill in the calculator with confidence.

Height

Your height, entered in centimeters/meters or feet and inches.

Why it matters:
It is paired with weight to judge healthy ranges and body composition.
Typical range:
Varies by person.
How it affects results:
  • Higher: A given weight reads as a lower BMI.
  • Lower: A given weight reads as a higher BMI.

Common mistake: Entering centimeters where meters are expected, or mixing units.

Weight

Your body weight, entered in kilograms or pounds.

Why it matters:
It feeds BMI, calorie, body-fat and dosing calculations.
Typical range:
Varies by person; tools accept metric or imperial.
How it affects results:
  • Higher: Raises BMI and calorie needs.
  • Lower: Lowers BMI and calorie needs.

Common mistake: Mixing units - entering pounds where kilograms are expected.

Target Weight

The weight you are aiming to reach.

Why it matters:
It sets the size of your calorie deficit or surplus and the timeline.
Typical range:
Often chosen within the healthy BMI range for your height.
How it affects results:
  • Higher: A surplus if above current weight (muscle gain).
  • Lower: A bigger deficit and longer journey if far below current weight.

Common mistake: Setting an unrealistic target below a healthy weight range.

Benchmark reference

What counts as poor, average or excellent for this metric.

Body Mass Index

Poor30+ (obese)
Below average<18.5 (underweight)
Average18.5-24.9 (healthy)
Above average25-29.9 (overweight)

Source: World Health Organization (WHO) · Updated June 2026

Typical values

Body Mass Index:
18.5-24.9 (healthy range)

Common interpretation errors

  • Using BMI for athletes or very muscular people
  • Ignoring body composition
  • Using adult BMI for children

What impacts results most

  1. 1.
    Height (High impact)The main input in every ideal-weight formula.
  2. 2.
    Sex (Medium impact)Shifts the base weight.

Key assumptions

  • Classic medical formulas (Devine, Robinson, etc.)
  • A range, not a single target

What's a typical value?

The healthy-BMI weight range for an adult is BMI 18.5\u201324.9 \u00d7 height (m)\u00b2.

Ideal body weight by height (Devine formula)

5'0"50 kg46 kg
5'2"55 kg50 kg
5'4"59 kg55 kg
5'6"64 kg59 kg
5'8"68 kg64 kg
5'10"73 kg69 kg
6'0"78 kg73 kg
6'2"82 kg78 kg
6'4"87 kg82 kg

Worked example

Inputs: Male, 178 cm (Devine formula) Calculation: 50 kg + 2.3 kg per inch over 5 ft (178 cm ≈ 70.1 in) Result: ≈ 73.2 kg What it means: Treat it as a range, not a single target — the healthy-BMI band is the practical guide.

Compared to alternatives

Ideal Weight vs Healthy Range

A single formula target versus the healthy-BMI band.

Ideal WeightHealthy Range
OutputOne numberA low-high range
BasisDevine/Robinson etc.BMI 18.5-24.9
Best forA rough targetA realistic goal band

Bottom line: Aim for the healthy range; treat any single 'ideal' number as approximate.

Ideal Weight calculator·Healthy Range calculator

Related concepts

How Ideal Weight connects to the concepts around it.

BMI:
Weight relative to height, a quick health screen.
Body Fat:
The share of body weight that is fat.
Waist-Hip Ratio:
Waist divided by hip, a fat-distribution risk marker.

Reviewed sources & methodology

Methodology: Professional Estimate · Last reviewed June 2026.

Keywords: ideal, weight.

This tool is for general information only and is not medical advice. Consult a qualified healthcare professional for decisions about your health.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Ideal Weight Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Ideal Weight Calculator?+

Ideal Weight Calculator uses the standard ideal weight formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Ideal Weight Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Ideal Weight Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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WHO BMI 18.5–24.9 range for your height.

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