Find Your Healthy Weight Range
See your ideal body weight using four established medical formulas — just enter your height and gender, no scale measurements required.
Your Results
Two Numbers, One Healthy Range
No scale, no tape measure — just your height and gender are enough to estimate a healthy weight range.
Enter Height & Gender
Choose your unit system, select male or female, and enter your height. Adding your current weight is optional.
We Run 4 Formulas
Your height is plugged into the Devine, Robinson, Miller, and Hamwi equations — four formulas developed over different decades.
Get Your Range
See your average ideal weight, the full healthy range across all four formulas, and how far your current weight is from it.
What Is Ideal Body Weight?
Ideal body weight (IBW) is a height-and-gender-based estimate of a healthy weight, calculated from medical formulas that were originally developed in the 1960s–80s to help clinicians dose medications accurately — many drugs need to be dosed relative to lean body size rather than total weight.
Over time, these same formulas were adopted more broadly as a quick reference point for a "healthy" weight target. They're simple, fast, and require no equipment beyond a height measurement, which is why they remain popular today even outside clinical settings.
Why People Still Use These Formulas
A Fast, Equipment-Free Estimate
All four formulas need only height and gender, making this one of the quickest ways to get a ballpark healthy-weight figure.
A Useful Starting Reference
IBW gives you a reasonable range to aim toward when setting a weight goal, especially if you have no other benchmark to start from.
Still Used in Clinical Settings
Hospitals and pharmacists still reference these exact formulas today for dosing certain medications and nutrition planning.
Importantly, ideal body weight is a reference point, not a strict target. It doesn't account for muscle mass, frame size, or individual body composition — a muscular athlete will often weigh well above their "ideal" weight while being perfectly healthy.
How Ideal Body Weight Is Calculated
Each formula estimates weight in kilograms from height in inches, with a different starting point and rate of increase per inch above 5 feet (60 inches).
Devine Formula
Men: 50.0 kg + 2.3 kg × (height in inches − 60)
Women: 45.5 kg + 2.3 kg × (height in inches − 60)
Robinson Formula
Men: 52 kg + 1.9 kg × (height in inches − 60)
Women: 49 kg + 1.7 kg × (height in inches − 60)
All Four Formulas
We calculate all four and average them for a more balanced estimate.
Swipe to see all columns →
| Formula | Year | Men | Women |
|---|---|---|---|
| Devine | 1974 | 50.0 kg + 2.3 kg × (in − 60) | 45.5 kg + 2.3 kg × (in − 60) |
| Robinson | 1983 | 52 kg + 1.9 kg × (in − 60) | 49 kg + 1.7 kg × (in − 60) |
| Miller | 1983 | 56.2 kg + 1.41 kg × (in − 60) | 53.1 kg + 1.36 kg × (in − 60) |
| Hamwi | 1964 | 48.0 kg + 2.7 kg × (in − 60) | 45.5 kg + 2.2 kg × (in − 60) |
For heights under 5 feet, the "(height − 60)" term becomes negative, which simply lowers the result proportionally — the math still works correctly for shorter heights.
Healthy Weight Ranges by Height
These example ranges show the spread between the lowest and highest of the four formulas at common heights.
| Height | Men (lbs) | Women (lbs) |
|---|---|---|
| 5'0" | 106–124 | 100–117 |
| 5'4" | 130–136 | 120–129 |
| 5'8" | 148–153 | 138–141 |
| 6'0" | 161–177 | 153–161 |
| 6'4" | 174–201 | 165–181 |
What Affects Your Ideal Weight
Figures above are illustrative averages across the four formulas and rounded for readability — use the calculator above for your exact numbers.
Ideal Weight vs Other Metrics
Ideal body weight is one of several tools for thinking about healthy weight — each measures something slightly different.
vs BMI
vs Body Fat %
8 Steps Toward a Healthy Weight
Whether you're aiming to gain or lose, sustainable progress comes from a handful of consistent habits.
Adjust Calories Gradually
A moderate 300–500 calorie deficit (to lose) or surplus (to gain) per day produces steady, sustainable change.
Strength Train Regularly
Resistance training helps build or preserve muscle, which matters more for health than the number on the scale.
Prioritize Protein Intake
Around 0.7–1g of protein per pound of bodyweight supports muscle maintenance whether you're losing or gaining.
Sleep 7–9 Hours
Poor sleep disrupts hunger hormones and recovery, making weight changes in either direction harder to manage.
Stay Consistent
Small, repeatable habits — regular meals, regular training — beat extreme short-term measures over time.
Track Trends, Not Daily Fluctuations
Body weight swings day to day from water and food. Look at weekly averages instead of single readings.
Get Professional Guidance
A doctor, dietitian, or trainer can personalize a target that accounts for your frame, muscle mass, and health history.
Be Patient
Healthy weight change is typically 0.5–1% of bodyweight per week — gradual progress that's far more likely to last.
Common Questions
Everything you need to know about ideal body weight and how it's calculated.