Which ideal weight formula is the most accurate?

No single formula is universally most accurate. The Devine formula is the most widely used in clinical settings, but Robinson and Miller tend to give slightly higher estimates that may be more realistic for modern populations. Using the average of all four gives you the most balanced estimate.

Why does this calculator only ask for height and gender?

The four classic ideal weight formulas (Devine, Robinson, Miller, Hamwi) were designed using only height and gender as inputs. They estimate lean body mass for medical dosing purposes. For a more complete picture, consider also calculating your BMI and measuring your waist circumference.

What if my weight is above or below the ideal range?

Being outside the range does not automatically mean you are unhealthy. If you carry significant muscle mass, you may weigh more than these formulas suggest and still be in excellent health. Conversely, being within the range does not guarantee good health. Use these numbers as one data point among many.

Do these formulas work for very tall or very short people?

These formulas become less accurate at extreme heights. They were developed using average-height populations and use a linear scaling factor that may overestimate ideal weight for very tall individuals and underestimate it for very short ones. If you are below 150 cm or above 195 cm, take the results with extra caution.

Should I use ideal weight or BMI to set my goal?

Neither should be your sole target. Ideal weight gives you a specific number to reference, while BMI gives you a healthy range. Both ignore body composition. The best approach is to combine these tools with body measurements, progress photos, and how you feel physically.

How often should I check my ideal weight?

Since the formulas only use height and gender, your calculated ideal weight will not change unless you grow taller. What changes is your actual body composition. Instead of rechecking the formula, focus on tracking your real progress through measurements, strength gains, and overall wellbeing.

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Ideal Weight Calculator

Find your ideal weight range using four trusted medical formulas — instantly and for free.

How Ideal Weight Is Calculated

Four established medical formulas estimate ideal body weight based on height and gender:

IBW = Base + Factor × (height_in − 60)

Enter your height

Your height is converted to inches internally. All four formulas use height in inches above 5 feet (60 inches) as their variable — the taller you are above this baseline, the more weight is added.

Select your gender

Each formula uses different base weights and scaling factors for men and women, reflecting average differences in bone structure and lean mass between sexes.

Compare four results

Rather than trusting a single number, you see results from Devine, Robinson, Miller, and Hamwi formulas side by side. The average gives you a practical reference range.

Why "Ideal Weight" Is a Range — Not a Number

The concept of ideal body weight was developed in the 1970s for medical dosing calculations. These formulas were never meant to define a single perfect weight for everyone. Your actual healthy weight depends on far more than height alone.

All four formulas produce different numbers — proving there is no single "ideal" weight. The spread between them is your realistic range
These formulas were originally created for drug dosing (especially anesthesia), not as fitness goals — they estimate lean body mass, not optimal aesthetics
Two people at the same height can have vastly different body compositions — one muscular, one not — and both can be healthy
Bone density, muscle mass, age, ethnicity, and activity level all influence what a healthy weight looks like for you specifically
BMI and ideal weight formulas complement each other but both have blind spots — neither accounts for where your body stores fat or how much muscle you carry
Your ideal weight can shift over time as you gain muscle, age, or change activity levels — it is not a fixed destination

Practical Tips for Reaching a Healthy Weight

1Build muscle through resistance training — muscle is denser than fat, so a muscular person may weigh more than their "ideal" and still be very healthy
2Eat sufficient protein (1.6–2.2 g/kg) — it preserves muscle during weight loss and supports recovery during training
3Prioritize 7–9 hours of sleep — sleep deprivation increases hunger hormones and makes weight management significantly harder
4Move more throughout the day — daily steps and non-exercise activity burn more calories than most people realize
5Track body measurements (waist, hips, chest) alongside weight — the scale does not tell you what you are gaining or losing
6Give your body time — sustainable weight change happens at 0.5–1 kg per week, not overnight

Common Ideal Weight Myths Debunked

"There is one perfect weight for my height"

Four different medical formulas give four different answers for the same person. Your healthy weight is a range, not a single number. Genetics, muscle mass, and lifestyle all influence where you should fall within that range.

"BMI and ideal weight are the same thing"

BMI classifies you into a health category based on weight and height. Ideal weight formulas estimate a specific weight target based on height and gender. They use different math and serve different purposes — neither is a complete health assessment.

"If the scale matches my ideal weight, I'm healthy"

Scale weight tells you nothing about body composition. You could hit your "ideal" weight while having high body fat and low muscle mass. Blood markers, body fat percentage, and physical fitness matter far more than the number on the scale.

"Your ideal weight never changes"

Your body composition shifts naturally with age, training, and lifestyle changes. A 25-year-old athlete and a 55-year-old office worker at the same height will have very different healthy weight ranges. Reassess periodically rather than chasing a fixed number.

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Frequently Asked Questions

Which ideal weight formula is the most accurate?: No single formula is universally most accurate. The Devine formula is the most widely used in clinical settings, but Robinson and Miller tend to give slightly higher estimates that may be more realistic for modern populations. Using the average of all four gives you the most balanced estimate.
Why does this calculator only ask for height and gender?: The four classic ideal weight formulas (Devine, Robinson, Miller, Hamwi) were designed using only height and gender as inputs. They estimate lean body mass for medical dosing purposes. For a more complete picture, consider also calculating your BMI and measuring your waist circumference.
What if my weight is above or below the ideal range?: Being outside the range does not automatically mean you are unhealthy. If you carry significant muscle mass, you may weigh more than these formulas suggest and still be in excellent health. Conversely, being within the range does not guarantee good health. Use these numbers as one data point among many.
Do these formulas work for very tall or very short people?: These formulas become less accurate at extreme heights. They were developed using average-height populations and use a linear scaling factor that may overestimate ideal weight for very tall individuals and underestimate it for very short ones. If you are below 150 cm or above 195 cm, take the results with extra caution.
Should I use ideal weight or BMI to set my goal?: Neither should be your sole target. Ideal weight gives you a specific number to reference, while BMI gives you a healthy range. Both ignore body composition. The best approach is to combine these tools with body measurements, progress photos, and how you feel physically.
How often should I check my ideal weight?: Since the formulas only use height and gender, your calculated ideal weight will not change unless you grow taller. What changes is your actual body composition. Instead of rechecking the formula, focus on tracking your real progress through measurements, strength gains, and overall wellbeing.