Question 1

What is an ideal body weight?

Accepted Answer

Ideal body weight (IBW) is a clinically-derived estimate of the weight range associated with the lowest health risks for your height. It is a healthy range — not a single number. The most common reference is the BMI healthy band of 18.5–24.9, which maps to a specific weight range depending on your height.

Question 2

How do you calculate ideal body weight?

Accepted Answer

The simplest method is to map the BMI healthy band (18.5–24.9) onto your height: Ideal Weight = BMI × height² (meters). For example, at 170 cm the range is 53.5–72.0 kg. Clinical formulas like Devine, Hamwi, Robinson, and Miller use a base weight at 5 feet plus an increment per inch above, with different values for males and females.

Question 3

Is ideal weight the same for men and women?

Accepted Answer

The BMI-based range is the same for both genders, but the clinical formulas (Devine, Hamwi, Robinson, Miller) produce different estimates for men and women. Men typically have higher lean mass, so their formula-derived ideal weights tend to be higher. Select your gender in the calculator to see personalized formula results.

Question 4

What is the ideal weight for a 5'6 female?

Accepted Answer

For a female at 5'6" (167.6 cm), the BMI-based healthy range is approximately 52.0–70.0 kg (114.6–154.3 lb). The Devine formula gives 59.3 kg, Robinson gives 59.2 kg, Miller gives 61.3 kg, and Hamwi gives 58.7 kg. These are estimates — your actual ideal depends on body composition and frame size.

Question 5

How accurate is an ideal weight calculator?

Accepted Answer

Ideal weight calculators are population-level screening tools, not personalized diagnoses. They work well for most adults as a general reference but cannot account for muscle mass, bone density, body fat distribution, or medical history. Use the range as a starting point, and consult a healthcare provider for a personalized assessment.

Question 6

What if my weight is outside the ideal range?

Accepted Answer

Being outside the range is a signal to check in, not a verdict. Small deviations are common and often healthy — athletes frequently exceed the upper end due to muscle mass. If you are significantly outside the range, look at trends, habits, and how you feel. A safe pace for weight change is 0.25–0.5 kg per week. Speak with a professional if you have concerns.

Question 7

Which ideal weight formula is the most accurate?

Accepted Answer

No single formula is universally 'most accurate.' Devine is the most widely cited in medical literature, but it was originally designed for drug dosing, not weight goals. Robinson and Miller are considered better for taller individuals. The BMI-based range (18.5–24.9) is the most practical for general health assessment because it gives a band rather than a single number.

Question 8

Does frame size affect ideal weight?

Accepted Answer

Yes. Body frame size — the breadth of your bones and skeletal structure — can shift your ideal weight by approximately ±10%. A large-framed person naturally carries more weight in bone and connective tissue. Use the wrist test: wrap your thumb and middle finger around your wrist. If they overlap, you have a small frame; if they touch, medium; if there's a gap, large.

Question 9

How does age affect ideal body weight?

Accepted Answer

The standard formulas do not adjust for age, but age matters in practice. Older adults naturally lose muscle mass (sarcopenia) and may have a 'normal' BMI but elevated body fat. For adults over 65, some research suggests a slightly higher BMI range (22–27) may be protective. Children and teens should use age-specific growth percentile charts, not adult formulas.

Question 10

Should I aim for the middle of the ideal weight range?

Accepted Answer

Not necessarily. Anywhere within the range is considered healthy. Some people feel best at the lower end, others at the upper end — it depends on your body composition, activity level, and how you feel. Athletes and muscular individuals often sit at or above the upper end of the range and are perfectly healthy. Choose a sustainable point rather than fixating on the midpoint.

Question 11

Can athletes rely on ideal weight calculators?

Accepted Answer

With caution. Athletes often carry significantly more muscle mass than the average person, so BMI-based ranges can read high. A rugby player or bodybuilder may have a BMI of 28 but only 12% body fat. For athletes, body composition measurements (DEXA scan, skinfold calipers, bioelectrical impedance) are more meaningful than ideal weight formulas.

Question 12

What is the difference between ideal weight and BMI?

Accepted Answer

BMI (Body Mass Index) is a ratio of weight to height squared: BMI = weight (kg) ÷ height² (m). Ideal weight is the weight range that corresponds to a healthy BMI (18.5–24.9). They are two expressions of the same relationship. BMI tells you where you are; ideal weight tells you the range to aim for.

Question 13

How is ideal body weight calculated for medication dosing?

Accepted Answer

In clinical settings, the Devine formula (1974) is most commonly used: IBW (male) = 50 kg + 2.3 kg per inch over 5 feet; IBW (female) = 45.5 kg + 2.3 kg per inch over 5 feet. For obese patients, an Adjusted Body Weight (ABW) is calculated: ABW = IBW + 0.4 × (actual weight − IBW). This is important for drugs like aminoglycosides and anesthetics.

Question 14

How often should I check my ideal weight?

Accepted Answer

For most adults, checking every few months is sufficient. If you are actively working on weight change, monthly check-ins help track progress without obsessing over daily fluctuations. Your ideal weight range does not change (it is based on height, which is stable in adults) — what changes is your current position within or relative to that range.

Question 15

Is ideal weight different for Asian populations?

Accepted Answer

The WHO recommends different BMI cutoffs for Asian populations due to higher cardiovascular risk at lower BMIs. The overweight threshold shifts from 25 to 23, and the obese threshold from 30 to 27.5. This means the 'healthy' ideal weight range for Asian individuals may be narrower. This calculator uses the standard 18.5–24.9 band; consider the lower range if you are of Asian descent.

Height	ft+in	Min (kg)	Max (kg)
150 cm	4ft 11in	41.6	56
155 cm	5ft 1in	44.4	59.8
160 cm	5ft 3in	47.4	63.7
165 cm	5ft 5in	50.4	67.8
170 cm	5ft 7in	53.5	72
175 cm	5ft 9in	56.7	76.3
180 cm	5ft 11in	59.9	80.7
185 cm	6ft 1in	63.3	85.2
190 cm	6ft 3in	66.8	89.9
195 cm	6ft 5in	70.3	94.7
200 cm	6ft 7in	74	99.6

Formula	Male (kg)	Female (kg)
Devine	65.9	61.4
Hamwi	66.7	60.7
Robinson	65.2	60.8
Miller	66	62.5

Ideal Weight Calculator

Formula Comparison

Detailed Breakdown

What is Ideal Body Weight?

How to Calculate Ideal Body Weight — Formulas

Frame Size and Ideal Weight

Ideal Weight Chart by Height

Why Do Ideal Weight Formulas Disagree?

Ideal Weight vs BMI — What's the Difference?

Common Mistakes When Using Ideal Weight Calculators

Limitations of Ideal Weight Calculators

Frequently Asked Questions

Embed Ideal Weight Calculator

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