Power Calculators

⚖️ Ideal Weight Calculator

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📏 How to measure height at homeTap to see the illustrated guide
Illustration: how to measure height at home — Stand barefoot on a hard floor with heels, bottom and shoulders against a wall, looking straight ahead. Rest a hardback book or ruler flat on top of the head, touching the wall, and mark underneath it.
  1. Stand barefoot on a hard floor with heels, bottom and shoulders against a wall, looking straight ahead.
  2. Rest a hardback book or ruler flat on top of the head, touching the wall, and mark underneath it.
  3. Measure from the floor to the mark with a steel tape. Children from age 2 are measured standing like this.
Barefoot, back against a wall, book flat on your head.
Ideal weight (Devine)
65.9 kg (145.4 lb)
Average of 4 formulas
65.9 kg (145.4 lb)
Healthy BMI weight range
53.5 – 72 kg
Weight at BMI 22 (middle of healthy range)
63.6 kg (140.2 lb)
Your height
170 cm (5 ft 7 in)

These formulas give a single reference weight. Any weight in the healthy BMI range can be healthy, depending on your frame and muscle.

Breakdown

FormulaIdeal weightIn pounds
Devine (1974)65.9 kg145.4 lb
Robinson (1983)65.2 kg143.7 lb
Miller (1983)66 kg145.4 lb
Hamwi (1964)66.7 kg147.1 lb
Healthy BMI range (18.5–24.9)53.5 – 72 kg118 – 159 lb

Formula at a glance

Ideal Weight formula: IBW (kg) = 50 + 2.3 × (height in inches − 60); IBW (kg) = 45.5 + 2.3 × (height in inches − 60)
How the ideal weight works: IBW (kg) = 50 + 2.3 × (height in inches − 60)

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📘 About the Ideal Weight

Your ideal body weight (IBW) is a reference weight for your height and sex. Doctors use it for drug doses and nutrition planning, and it is a handy goal for anyone wanting to know 'how much should I weigh for my height?'

This calculator shows the four best-known formulas — Devine, Robinson, Miller and Hamwi — together with the healthy weight range from BMI 18.5 to 24.9, so you can see a realistic target range rather than one number.

Enter your height in centimetres (5 ft = 152.4 cm, 5 ft 6 in = 167.6 cm) and choose male or female.

🧮 Formula

Devine – men
IBW (kg) = 50 + 2.3 × (height in inches − 60)
Devine – women
IBW (kg) = 45.5 + 2.3 × (height in inches − 60)
Robinson
Men 52 + 1.9 kg, women 49 + 1.7 kg per inch over 5 ft
Miller
Men 56.2 + 1.41 kg, women 53.1 + 1.36 kg per inch over 5 ft
Hamwi
Men 48 + 2.7 kg, women 45.5 + 2.2 kg per inch over 5 ft

Where

  • Height in inches = height in cm ÷ 2.54
  • 5 ft = 60 inches

✏️ Worked examples

Man, 170 cm (5 ft 7 in)

You enter
Height170 cm
GenderMale
You get
Ideal weight (Devine)65.9 kg (145.4 lb)
Average of 4 formulas65.9 kg (145.4 lb)
Healthy BMI weight range53.5 – 72 kg
Weight at BMI 22 (middle of healthy range)63.6 kg (140.2 lb)
Your height170 cm (5 ft 7 in)

Ideal weight 65.9 kg (145.4 lb); average of four formulas 65.9 kg (145.4 lb); healthy BMI range 53.5 – 72 kg.

Try this example →

Woman, 160 cm (5 ft 3 in)

You enter
Height160 cm
GenderFemale
You get
Ideal weight (Devine)52.4 kg (115.5 lb)
Average of 4 formulas53.9 kg (118.9 lb)
Healthy BMI weight range47.4 – 63.7 kg
Weight at BMI 22 (middle of healthy range)56.3 kg (124.2 lb)
Your height160 cm (5 ft 3 in)

Ideal weight 52.4 kg (115.5 lb); healthy BMI range 47.4 – 63.7 kg.

Try this example →

Man, 180 cm (5 ft 11 in)

You enter
Height180 cm
GenderMale
You get
Ideal weight (Devine)75 kg (165.3 lb)
Average of 4 formulas74.1 kg (163.4 lb)
Healthy BMI weight range59.9 – 80.7 kg
Weight at BMI 22 (middle of healthy range)71.3 kg (157.1 lb)
Your height180 cm (5 ft 11 in)

Ideal weight 75 kg (165.3 lb); healthy BMI range 59.9 – 80.7 kg.

Try this example →

🧭 How to use this calculator

What you enter

  • Height (cm)Barefoot, back against a wall, book flat on your head.
  • Gender

What you get

  • Ideal Weight (kg)
  • Robinson Formula (kg)
  • Miller Formula (kg)
  • Hamwi Formula (kg)
  • Healthy BMI Weight From (kg)
  • Healthy BMI Weight To (kg)

💡 Ideal weight chart (Devine formula)

  • 5 ft 0 in (152 cm): men 50 kg, women 45.5 kg
  • 5 ft 3 in (160 cm): men 56.9 kg, women 52.4 kg
  • 5 ft 6 in (168 cm): men 63.8 kg, women 59.3 kg
  • 5 ft 9 in (175 cm): men 70.7 kg, women 66.2 kg
  • 6 ft 0 in (183 cm): men 77.6 kg, women 73.1 kg

❓ Frequently asked questions

How much should I weigh for my height?

A healthy weight is any weight that keeps your BMI between 18.5 and 24.9. The ideal-weight formulas give one reference point inside or near that range.

What is the ideal weight for a 5 ft 6 in man?

About 63.8 kg by the Devine formula, with a healthy BMI range of roughly 52 to 70 kg.

What is the ideal weight for a 5 ft 3 in woman?

About 52.4 kg by the Devine formula, with a healthy BMI range of roughly 47 to 64 kg.

Is ideal weight the same as healthy weight?

Not exactly. Ideal weight is a single formula value; a healthy weight is a range. Muscle, frame size and age all matter.

Why do men and women get different results?

Men usually have more muscle and bone mass at the same height, so the formulas start from a higher base for men.

Does it work for short or tall people?

The formulas were made for adults 5 ft (152 cm) and taller and are less reliable at the extremes. Use the BMI range there.

What people are saying
★★★★★
Anonymous · 05 Oct 2026