What is the ideal weight for a 180 cm man?

Using the BMI healthy range (18.5–24.9), a 180 cm man's ideal weight range is approximately 60–81 kg. The Hamwi formula gives about 77 kg and the Devine formula gives about 75 kg as single-point estimates.

Does muscle mass affect ideal weight calculations?

Yes, significantly. These formulas are based on average population data and do not account for body composition. A muscular man may weigh above the calculated ideal weight while having very low body fat, which is perfectly healthy.

At what age do men typically reach their heaviest?

Most men reach their peak weight in their 50s and early 60s, often gaining 0.5–1 kg per year through middle age. Age-related muscle loss (sarcopenia) begins around 30 and accelerates after 50, often replaced by fat.

Does the calculator work offline?

Once the page has loaded, yes. The formula runs in the open tab, so it keeps working if your connection drops. Reloading or opening another page needs a connection again.

Ideal body weight for men

Enter your height to find your ideal body weight range as a man. Three established formulas are shown side by side (Hamwi, Devine, and the WHO BMI range) so you can see how they compare. Both metric (cm) and imperial (feet/inches) are supported.

Sex

Height units

Height (cm)

Results are for informational purposes and do not constitute medical advice.

How it works

Three formulas are calculated and shown simultaneously. Hamwi (1964): men 48 kg + 2.7 kg per inch over 5 ft; women 45.5 kg + 2.2 kg per inch over 5 ft. Devine (1974): men 50 kg + 2.3 kg per inch over 5 ft; women 45.5 kg + 2.3 kg per inch over 5 ft. WHO BMI range applies BMI 18.5–24.9 to height (m²) to give a weight range. Imperial inputs are converted to metric (1 ft = 30.48 cm, 1 in = 2.54 cm) before calculation. All arithmetic runs locally in your browser.

Processing runs in your browser

All calculations happen locally in your browser tab. Our servers are not involved at any point.

Technical specification

The Hamwi formula comes from G.J. Hamwi's chapter Therapy: changing dietary concepts in Diabetes Mellitus: Diagnosis and Treatment (American Diabetes Association, 1964) and is widely used in dietetics. The Devine formula was published by B.J. Devine in Drug Intelligence and Clinical Pharmacy (1974), in a paper on gentamicin dosing, and is standard in drug dosing for renally cleared medications. The WHO BMI range (18.5–24.9) is derived from the WHO Technical Report Series 894 (2000) and is considered the most broadly evidence-based reference.

Hamwi formula: Hamwi, American Diabetes Association, 1964
Devine formula: Devine, Drug Intell Clin Pharm, 1974
WHO BMI range: BMI 18.5–24.9 (WHO TRS 894, 2000)
Browser API: Pure JavaScript arithmetic. No library

Related operations

For a general weight category from your height and weight, try the BMI calculator. To measure body composition with circumference inputs, use the body fat calculator. For daily energy targets at a goal weight, see the calorie calculator.

Frequently asked questions

What is the ideal weight for a 180 cm man?: Using the BMI healthy range (18.5–24.9), a 180 cm man's ideal weight range is approximately 60–81 kg. The Hamwi formula gives about 77 kg and the Devine formula gives about 75 kg as single-point estimates.
Does muscle mass affect ideal weight calculations?: Yes, significantly. These formulas are based on average population data and do not account for body composition. A muscular man may weigh above the calculated ideal weight while having very low body fat, which is perfectly healthy.
At what age do men typically reach their heaviest?: Most men reach their peak weight in their 50s and early 60s, often gaining 0.5–1 kg per year through middle age. Age-related muscle loss (sarcopenia) begins around 30 and accelerates after 50, often replaced by fat.
Does the calculator work offline?: Once the page has loaded, yes. The formula runs in the open tab, so it keeps working if your connection drops. Reloading or opening another page needs a connection again.

Last reviewed September 30, 2026

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