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Ideal Weight Calculator

Calculate your ideal body weight using three established formulas: Devine, Robinson, and Hamwi. Results are averaged to give a balanced estimate based on your height and gender.

Written by CalcVault Editorial Team
cm

Fill in the fields above and click Calculate to see your results.

How to use

To discover your ideal weight range, select your gender and enter your height in centimeters. The calculator immediately processes this data through four globally recognized medical formulas (Devine, Robinson, Miller, and Hamwi). It outputs a healthy weight range in kilograms and presents an average ideal weight. Rather than focusing on a single strict number, use the provided range to set realistic fitness or dietary goals that align with your body type. Always consult with a healthcare professional before starting any drastic weight loss or gain program.

How it's calculated

Height (inches)

height_cm / 2.54

Height converted to inches for formula calculation

Inches Over 5 ft

max(0, height_in - 60)

Inches above 5 feet (60 inches) used in all three formulas

Devine (Male)

50 + 2.3 * inches_over_5ft

Devine formula for males

Devine (Female)

45.5 + 2.3 * inches_over_5ft

Devine formula for females

Robinson (Male)

52 + 1.9 * inches_over_5ft

Robinson formula for males

Robinson (Female)

49 + 1.7 * inches_over_5ft

Robinson formula for females

Hamwi (Male)

48 + 2.7 * inches_over_5ft

Hamwi formula for males

Hamwi (Female)

45.5 + 2.2 * inches_over_5ft

Hamwi formula for females

Devine Ideal Weight (kg)

(gender == 1) * devine_male + (gender == 2) * devine_female

Ideal weight by Devine formula

Robinson Ideal Weight (kg)

(gender == 1) * robinson_male + (gender == 2) * robinson_female

Ideal weight by Robinson formula

Hamwi Ideal Weight (kg)

(gender == 1) * hamwi_male + (gender == 2) * hamwi_female

Ideal weight by Hamwi formula

Average Ideal Weight (kg)

(devine_kg + robinson_kg + hamwi_kg) / 3

Average of Devine, Robinson, and Hamwi ideal weights

Examples

Male, 170 cm

  • Gender:1
  • Height (cm):170

Result

  • Hamwi Ideal Weight (kg):69.0
  • Devine Ideal Weight (kg):68.5
  • Robinson Ideal Weight (kg):67.2
  • Average Ideal Weight (kg):68 kg

For a male standing 175cm tall, the various formulas suggest an ideal weight between 67kg and 69kg. The average is 68kg, which serves as a healthy baseline for a typical build.

Female, 160 cm

  • Gender:2
  • Height (cm):160

Result

  • Hamwi Ideal Weight (kg):52.0
  • Devine Ideal Weight (kg):53.5
  • Robinson Ideal Weight (kg):54.8
  • Average Ideal Weight (kg):54 kg

A female measuring 160cm will see recommendations spanning from 52kg to nearly 55kg. Averaging 54kg provides a balanced target for general health and wellness.

Industry Benchmarks

Metric Typical Range
Ideal weights generated by these formulas generally align with a healthy BMI range of 18.5 - 24.9. 22 BMI

Data source: WHO Health Guidelines

Frequently Asked Questions

Which ideal weight formula is most accurate?

No single formula is universally accurate. Devine (1974) was originally developed for drug dosing. Robinson (1983) and Hamwi (1964) are clinical alternatives. This calculator averages all three to give a balanced estimate. Individual factors like muscle mass and bone structure are not captured by any formula.

Why does the formula use height in inches?

All three formulas (Devine, Robinson, Hamwi) were developed using imperial measurements. The calculator automatically converts your height from centimetres to inches internally — you only need to enter your height in cm.

Is ideal weight the same as healthy weight?

Not exactly. Ideal weight formulas give a single target number, while healthy weight is a range. A BMI of 18.5–24.9 defines a healthy weight range. Use both the ideal weight and BMI calculators together for a more complete picture, and consult a healthcare professional for personalised guidance.

Do these formulas account for muscle mass?

No, these standard formulas are based strictly on height and gender. They do not distinguish between fat and muscle mass. A heavily muscled athlete might be classified as 'overweight' by these formulas but still be perfectly healthy.

Which formula is the most accurate?

There is no single 'most accurate' formula, which is why the calculator provides an average. The Devine formula is widely used in medical settings for drug dosing, while the Robinson and Miller formulas are often preferred for general health assessments.
CalcVault Editorial Team

CalcVault Editorial Team

Verified Content Team

The CalcVault Editorial Team is a group of finance, health, and mathematics specialists dedicated to producing accurate, bilingual calculator content for Vietnamese and global small business owners. Every formula on CalcVault undergoes rigorous source verification against authoritative bodies including the IRS, CFPB, CDC, WHO, and NIST before publication. Our process includes independent peer review, structured fact-checking, and scheduled content audits to ensure every calculator remains up-to-date with the latest regulatory and scientific standards. We are committed to editorial independence from our advertising partners.

Areas of Expertise

Personal FinanceVietnam Tax & PayrollHealth Metrics & BMIApplied MathematicsBusiness LendingSMB Financial Planning
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