Ideal Weight Calculator
Estimate a healthy target weight for your height using the Devine formula and BMI range.
Inputs
Ideal Weight (Devine)
70.5
Healthy Range — Low (kg)
56.7
Healthy Range — High (kg)
76.3
Step by step
Convert height to inches
175.0 cm ÷ 2.54
= 68.90 in
Inches over 5 ft (60 in)
max(0, 68.90 − 60)
= 8.90 in
Devine formula — Male: 50 + 2.3 × over5ft
50 + 2.3 × 8.90
= 70.5 kg
Convert height to metres for BMI range
175.0 ÷ 100
= 1.750 m
Healthy weight range (BMI 18.5 – 24.9)
18.5 × 1.750² to 24.9 × 1.750²
= 56.7 – 76.3 kg
How it works
The Devine formula gives a single reference weight based on height and sex, while the BMI-based range shows the span of weights considered healthy for your height (BMI 18.5–24.9).
Formulas
Devine formula — Male
IBW (kg) = 50 + 2.3 × (height in inches − 60)
- 60
- Five feet expressed in inches
- IBW
- Ideal body weight in kilograms
- h_in
- Height in inches
Devine formula — Female
IBW (kg) = 45.5 + 2.3 × (height in inches − 60)
- 60
- Five feet expressed in inches
- IBW
- Ideal body weight in kilograms
- h_in
- Height in inches
Healthy BMI range
Healthy weight range = BMI × height (m)² for BMI 18.5 to 24.9
- W_low
- Lower bound of healthy weight (kg)
- W_high
- Upper bound of healthy weight (kg)
- h_m
- Height in metres
This is an estimate and not medical advice. Ideal weight varies with individual body composition, age, and health conditions. Consult a healthcare professional for personalised guidance.
Frequently Asked Questions
Which number should I aim for?
Treat the BMI range as your healthy target zone; the Devine figure is one point of reference within it. Individual ideal weight depends on muscle, frame, and health factors.
Is ideal weight one exact number?
No. Healthy weight is a range, and factors like muscle mass and body composition matter more than a single target.