Ideal Body Weight Calculator
About the Ideal Body Weight Calculator
The Ideal Body Weight Calculator on ProCalc.ai gives you a quick, practical target weight based on the Devine formula, using your height and gender. You’ll see it used most often by people tracking fitness or nutrition goals, like gym-goers dialing in a cut or bulk and dietitians who want a fast reference point during a consult. A common real-world moment is when you’re setting a calorie target for a new training plan and you want a reasonable weight benchmark before you adjust macros or choose a goal rate of change. You enter your height and select your gender, then the Ideal Body Weight Calculator instantly returns your estimated ideal body weight, with no signup and no waiting. It’s free, straightforward, and built for quick checks when you’re planning, comparing, or just trying to make your next health decision a little more grounded.
How does the ideal body weight calculator work?
Enter your values into the input fields and the calculator instantly computes the result using standard health formulas. No sign-up required — results appear immediately as you type.
What Is the Ideal Body Weight Calculator?
The Ideal Body Weight Calculator estimates a target weight range based on height, sex, and frame size using four established formulas: Devine, Robinson, Miller, and Hamwi. It returns the per-formula estimate and a consensus midpoint, plus a healthy BMI range as a cross-check.
How to Use This Calculator
Enter height in feet/inches or centimeters and select sex. Optional: choose a frame size (small, medium, large) — wrist circumference is the standard objective frame measure. The calculator returns ideal weights from each formula. The Devine formula is most commonly used for clinical drug dosing; the others are more often used for general fitness targets.
Common Use Cases
- Clinical drug dosing: Many medications (especially anesthetics and aminoglycoside antibiotics) are dosed by ideal body weight rather than actual body weight to avoid overdose in obese patients. Devine is the standard reference.
- Fitness goal-setting: A 5'10" man's Hamwi IBW is 166 lbs; a Devine IBW is 161 lbs — useful as a long-term anchor for body recomposition.
- Bariatric surgery evaluation: Excess body weight (actual minus ideal) is a key qualifier for bariatric procedures.
- Athletic targets: Endurance athletes often target 5-10% below IBW; strength athletes typically run 10-20% above with higher lean mass.
Understanding the Results
Ideal body weight formulas were derived in the 1960s-1980s from population norms and were never meant to define a single "correct" weight. The 5-15 lb spread between formulas reflects this — it's a reasonable target range, not a precise number. BMI in the 18.5-24.9 range is the WHO healthy weight band; if your IBW puts you outside that, frame size and muscle mass likely explain the difference.
Industry Standards and Tips
The Devine formula (1974): IBW (kg) = 50 + 2.3 × (height in inches over 60) for men; 45.5 + 2.3 × (inches over 60) for women. Robinson (1983) and Miller (1983) are slightly newer revisions. None of these account for body composition — a 6'0" lean athlete at 200 lbs and a 6'0" sedentary adult at 200 lbs read identically by IBW but are nothing alike clinically. Use IBW as one signal alongside body fat percentage and waist circumference.
Pair with a body composition tracker, or see other Health calculators on ProCalc.ai for related metrics.
Ideal Body Weight Calculator — Frequently Asked Questions(8)
Common questions about ideal body weight.
Last updated Apr 2026
What the Ideal Body Weight (IBW) Calculator does
On ProCalc.ai, 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) ProCalc.ai also converts kg to lb using: - pounds = kilograms × 2.20462
The calculator rounds both outputs to 1 decimal place.
How to use the ProCalc.ai 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, ProCalc.ai 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) ProCalc.ai 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 ProCalc.ai’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
Ideal Body Weight Formula & Method
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.
Ideal Body Weight Sources & References
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