Ideal Body Weight Calculator

What the Ideal Body Weight (IBW) Calculator does

On ProcalcAI, this calculator: - Takes your height in inches - Lets you choose male (1) or female (0) - Outputs your ideal body weight in kilograms and pounds (rounded to 1 decimal)

Important context: Ideal body weight is not the same as “healthy weight,” “goal weight,” or “body fat percentage.” It’s a formula-based estimate, not a diagnosis.

The Devine formula (what the calculator uses)

### Step 1: Convert your height to inches (if needed) If you know your height in feet and inches: - Height in inches = (feet × 12) + inches

Examples: - 5 ft 10 in = (5 × 12) + 10 = 70 inches - 6 ft 2 in = (6 × 12) + 2 = 74 inches

### Step 2: Apply the Devine formula in kilograms Let: - h = height in inches - For males: IBW(kg) = 50 + 2.3 × (h − 60) - For females: IBW(kg) = 45.5 + 2.3 × (h − 60)

So the formula always starts at: - 50 kg at 60 inches for males - 45.5 kg at 60 inches for females Then adds 2.3 kg per inch over 60 inches.

### Step 3: Convert kilograms to pounds (optional) ProcalcAI also converts kg to lb using: - pounds = kilograms × 2.20462

The calculator rounds both outputs to 1 decimal place.

How to use the ProcalcAI inputs correctly

1) Height (inches) This must be a number like 64, 70, 73.5 (if you want to be very precise). Most people will use a whole number.

2) Sex selection as a numeric input - Male = 1 - Female = 0

Behind the scenes, ProcalcAI uses that value to choose the correct Devine baseline (50 vs 45.5).

Worked examples (step-by-step)

### Example 1: Male, 5 ft 10 in Given - Height: 5 ft 10 in = 70 inches - Sex: male

Step 1: Devine in kg IBW(kg) = 50 + 2.3 × (70 − 60) = 50 + 2.3 × 10 = 50 + 23 = 73.0 kg

Step 2: Convert to lb IBW(lb) = 73.0 × 2.20462 = 160.9 lb (rounded to 1 decimal)

Result - 73.0 kg - 160.9 lb

### Example 2: Female, 5 ft 4 in Given - Height: 5 ft 4 in = 64 inches - Sex: female

Step 1: Devine in kg IBW(kg) = 45.5 + 2.3 × (64 − 60) = 45.5 + 2.3 × 4 = 45.5 + 9.2 = 54.7 kg

Step 2: Convert to lb IBW(lb) = 54.7 × 2.20462 = 120.6 lb (rounded to 1 decimal)

Result - 54.7 kg - 120.6 lb

### Example 3: Female, 6 ft 0 in Given - Height: 6 ft 0 in = 72 inches - Sex: female

Step 1: Devine in kg IBW(kg) = 45.5 + 2.3 × (72 − 60) = 45.5 + 2.3 × 12 = 45.5 + 27.6 = 73.1 kg

Step 2: Convert to lb IBW(lb) = 73.1 × 2.20462 = 161.2 lb (rounded to 1 decimal)

Result - 73.1 kg - 161.2 lb

How to interpret your IBW result (without overreading it)

IBW is often used alongside other measures, such as: - BMI (Body Mass Index): weight relative to height (doesn’t directly measure body fat) - Waist circumference: a proxy for central fat distribution - Body composition: lean mass vs fat mass - Clinical context: age, training status, pregnancy, and medical conditions

Two people with the same height and sex can have very different healthy weights depending on muscle mass, bone structure, and overall body composition. For example, strength-trained individuals often weigh more than IBW while still being metabolically healthy.

Pro Tips for getting the most useful result

Common mistakes (and how to avoid them)

2) Mixing up feet and inches Typing “5.10” to mean 5 ft 10 in is a classic error. The calculator needs total inches: - 5 ft 10 in = 70 inches, not 5.10

3) Selecting the wrong sex input (1 vs 0) ProcalcAI uses numeric values: - male = 1 - female = 0 If you flip it, the result shifts by 4.5 kg (about 9.9 lb) at the same height because the baseline differs (50 vs 45.5).

4) Assuming IBW equals a healthy weight for everyone IBW is a formula estimate. It does not account for muscle mass, body frame size, or fat distribution. Treat it as a reference, not a verdict.

5) Over-focusing on a single number Health outcomes usually track better with trends (habits, waist size, fitness, lab markers) than with hitting one computed weight.

By understanding the Devine formula, entering height in inches, and interpreting the output as a reference (not a mandate), you’ll get the most practical value from ProcalcAI’s Ideal Body Weight Calculator.

Authoritative Sources

This calculator uses formulas and reference data drawn from the following sources:

- CDC — Physical Activity - NIH — National Institute of Diabetes - NIH — National Heart, Lung, and Blood Institute

This ideal body weight calculator uses standard health formulas to compute results. Enter your values and the formula is applied automatically — all math is handled for you. The calculation follows industry-standard methodology.

• https://www.nih.gov
• https://www.who.int
• https://www.cdc.gov