Ideal Weight Calculator

What the Ideal Weight Calculator Does (and What It Doesn’t)

1) A single “ideal weight” estimate using the Devine formula (a widely used clinical reference point). 2) A healthy “ideal weight range” based on the BMI (Body Mass Index) normal category, using BMI 18.5 to 24.9.

This is best used as a starting point for goal-setting, clothing sizing expectations, or a quick health check-in—not as a diagnosis. “Ideal” weight varies with body composition, muscle mass, frame size, age, pregnancy status, and medical conditions. For clinical guidance, discuss results with a qualified clinician.

Inputs You’ll Need

- Height (feet) - Height (inches) - Gender (male or female)

Behind the scenes, the calculator converts height to centimeters and then computes: - a BMI-based weight range (low and high), and - a Devine “ideal” weight.

Key terms you’ll see in this guide: BMI, Devine formula, height conversion, healthy weight range, normal BMI, pounds, kilograms.

Step-by-Step: How the Calculator Computes Your Results

### 1) Convert height to total inches First, it converts your height into total inches:

- Total inches = (feet × 12) + inches

Example: 5 ft 10 in Total inches = (5 × 12) + 10 = 70 inches

### 2) Convert inches to centimeters (and meters) The calculator converts inches to centimeters using:

- Height in cm = total inches × 2.54 Then it converts cm to meters for BMI math: - Height in meters = (height in cm) ÷ 100

So if you are 70 inches: - Height in cm = 70 × 2.54 = 177.8 cm - Height in meters = 177.8 ÷ 100 = 1.778 m

This height conversion matters because BMI is defined using meters.

### 3) Compute the BMI-based “ideal weight range” BMI is defined as:

- BMI = weight(kg) ÷ height(m)²

To reverse that and find weight from BMI: - weight(kg) = BMI × height(m)²

ProcalcAI uses the “normal BMI” category: - Low end BMI = 18.5 - High end BMI = 24.9

So: - Low weight(kg) = 18.5 × height(m)² - High weight(kg) = 24.9 × height(m)²

Then it converts kilograms to pounds using: - pounds = kilograms × 2.205

Finally, it rounds to one decimal place.

So the calculator’s healthy weight range is a BMI-normal range expressed in pounds.

### 4) Compute the Devine “ideal weight” estimate The Devine formula is based on height above or below 5 feet (60 inches). It uses a base weight at 5 feet, then adds (or subtracts) 2.3 per inch away from 60 inches.

- For males: Devine = 50 + 2.3 × (total inches − 60)

- For females: Devine = 45.5 + 2.3 × (total inches − 60)

This result is in kilograms. The calculator returns it rounded to one decimal place.

Important nuance: ProcalcAI’s current logic returns the Devine value as a single number without converting it to pounds. Meanwhile, the BMI range is converted to pounds. So you may see the Devine estimate in kilograms and the range in pounds. If you want them in the same unit, convert Devine kg to pounds by multiplying by 2.205.

Worked Examples (2–3)

### Example 1: Male, 5 ft 10 in Inputs - Height: 5 ft 10 in - Gender: male

Step A: Height conversion - Total inches = 70 - Height cm = 70 × 2.54 = 177.8 cm - Height m = 1.778

Step B: BMI range (in pounds) - height² = 1.778² ≈ 3.161 - Low kg = 18.5 × 3.161 ≈ 58.5 kg - High kg = 24.9 × 3.161 ≈ 78.7 kg - Low lb = 58.5 × 2.205 ≈ 129.0 lb - High lb = 78.7 × 2.205 ≈ 173.5 lb

Step C: Devine (in kilograms) - Devine = 50 + 2.3 × (70 − 60) = 50 + 2.3 × 10 = 73.0 kg

If you want Devine in pounds: - 73.0 × 2.205 ≈ 161.0 lb

Interpretation - BMI “ideal” range: about 129.0 to 173.5 lb - Devine estimate: 73.0 kg (about 161.0 lb)

### Example 2: Female, 5 ft 4 in Inputs - Height: 5 ft 4 in - Gender: female

Step A: Height conversion - Total inches = (5 × 12) + 4 = 64 - Height cm = 64 × 2.54 = 162.56 cm - Height m = 1.6256

Step B: BMI range (in pounds) - height² = 1.6256² ≈ 2.643 - Low kg = 18.5 × 2.643 ≈ 48.9 kg - High kg = 24.9 × 2.643 ≈ 65.8 kg - Low lb = 48.9 × 2.205 ≈ 107.8 lb - High lb = 65.8 × 2.205 ≈ 145.1 lb

Step C: Devine (in kilograms) - Devine = 45.5 + 2.3 × (64 − 60) = 45.5 + 2.3 × 4 = 54.7 kg

Devine in pounds: - 54.7 × 2.205 ≈ 120.6 lb

Interpretation - BMI “ideal” range: about 107.8 to 145.1 lb - Devine estimate: 54.7 kg (about 120.6 lb)

### Example 3: Male, 6 ft 2 in Inputs - Height: 6 ft 2 in - Gender: male

Step A: Height conversion - Total inches = (6 × 12) + 2 = 74 - Height cm = 74 × 2.54 = 187.96 cm - Height m = 1.8796

Step B: BMI range (in pounds) - height² = 1.8796² ≈ 3.533 - Low kg = 18.5 × 3.533 ≈ 65.4 kg - High kg = 24.9 × 3.533 ≈ 88.0 kg - Low lb = 65.4 × 2.205 ≈ 144.2 lb - High lb = 88.0 × 2.205 ≈ 194.0 lb

Step C: Devine (in kilograms) - Devine = 50 + 2.3 × (74 − 60) = 50 + 2.3 × 14 = 82.2 kg

Devine in pounds: - 82.2 × 2.205 ≈ 181.3 lb

Pro Tips for Using the Results Well

Common Mistakes (and How to Avoid Them)

Used thoughtfully, ProcalcAI’s Ideal Weight Calculator gives you a fast, practical reference: a BMI-based normal range plus a Devine-based single-point estimate—two perspectives that are more useful together than either one alone.

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 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