What Is Your Ideal Body Weight? The Real Answer

A guy at my gym kept his goal weight written on a strip of tape inside his locker door. 175 pounds. He’d pulled it off some calculator years back, and he’d spent the time since chasing that number, never quite hitting it, getting quietly miserable about the gap. When he finally asked me straight out whether 175 was even right, I gave him the answer almost nobody wants: it was never a real number to begin with. There isn’t a single ideal body weight sitting out there waiting to be found, his or anyone’s. There’s a range, and he’d been living inside his the whole time.

That’s the part the calculators leave out. They hand back one tidy figure, you treat it as a verdict, and then you spend months at war with the scale over a number that was only ever one rough estimate among several.

Your Ideal Body Weight Is a Range, Not a Number

The medical world’s own definition of a healthy weight is a band, not a point. A healthy BMI runs from 18.5 all the way up to 24.9, and once you turn that into actual pounds at a given height, the window is wider than most people expect. Take someone five-foot-eight: anything from about 122 to 164 pounds lands in the healthy zone. Forty-two pounds of headroom, which sounds like a glitch until you see what it’s there to absorb. Two people the same height can both be perfectly healthy while one is small-boned and lightly built and the other is broad and carrying real muscle. Factor in the differences between men and women, plus a bit of personal taste, and the spread stops looking absurd at all.

The CDC is blunt about it: BMI is a screening tool, meant to be read next to your blood pressure and an honest look at you, not a sentence handed down on its own (our BMI digs into where it works and where it breaks). So stop hunting for your number. Work out your range instead, then pick a spot inside it that suits your frame and what you’re training for.

The Famous Formulas Were Built for Doctors, Not Dieters

Long before calculators, clinicians leaned on a handful of equations to estimate ideal weight, and most online tools still quietly run them under the hood. Four are worth knowing.

Formula	Year	Originally built for
Hamwi	1964	Quick clinical nutrition estimates
Devine	1974	Calculating drug doses
Robinson	1983	A lighter update to Devine
Miller	1983	An update to Devine for taller people

What they share is sitting right there in the last column. Pai & Paloucek traces them to old height-weight insurance tables, and Devine, the one everybody uses, was actually built to help calculate drug doses, not to hand anyone a figure to diet toward. They got drafted into service as goals later, which was never the idea. You can see it in how they disagree: a five-foot-ten man comes out around 161 pounds by Devine and roughly 155 by Robinson, the same man, six pounds apart depending on which decades-old equation you ask. Run your height through our ideal weight calculator and it gives you all four at once, which is the honest way to read them: a cluster, not a single truth.

Frame Size Nudges the Whole Thing

The formulas all quietly assume an average build, and most people aren’t average. Frame size alone can move a sensible target by ten or fifteen pounds in either direction. There’s a rough two-second test for it: reach across and wrap your thumb and middle finger around your other wrist. Fingers that overlap easily mean a small frame. If they only just meet, you’re somewhere in the middle. And if they don’t come close, you’re large-framed. It isn’t lab science, but it tracks what an experienced clinician would eyeball anyway. From there it’s a small tweak: a large frame adds maybe ten percent to the formula’s number, a small one comes down about the same, average stays put. None of it buys real precision, which was never on the table, but it gets you closer to a number that fits your skeleton.

What You’re Made Of Matters More Than the Number

This is where weight on its own quietly lies. Picture two men who both weigh 180 pounds, except one sits at 12 percent body fat and the other at 28. To every ideal-weight formula going, they’re the same man. They obviously aren’t. One is lean and low-risk; the other is carrying more fat than is good for him, and the scale cannot tell the two apart. Muscle and fat take up different amounts of space and behave differently once they’re there, which is how one identical reading can sit on top of a healthy body or a struggling one. It’s exactly how somebody hits a “healthy” weight on too little muscle and too much hidden fat, the skinny-fat trap. So before you commit to any goal weight, get a read on your body fat too; our body fat calculator does it in a couple of minutes. The two numbers together tell you something. Either one alone barely does.

A Real Example, Start to Finish

Take that five-foot-ten man again: medium frame, lifting three times a week, around 16 percent body fat. Devine puts him at 161 pounds; his healthy BMI range runs from roughly 129 to 174. His frame’s average, so no adjustment, but he’s lean and carries real muscle, which pushes a sensible target up toward 165 to 175. Now say he actually weighs 180. His BMI lands at 25.8, which a chart will cheerfully stamp “overweight” while the man himself is visibly lean. The number is wrong about him; his composition is telling the truth. That gap is the whole reason one “ideal weight” falls apart the moment it meets a real person.

How to Set Your Target, and How Fast to Chase It

Put together, the process is short. Work out your healthy BMI range first, the lightest and heaviest you can be while staying between 18.5 and 24.9, and treat that as your outer fence. Then bring it in by frame: if you’re small-boned, aim at the lower end; broad and big-jointed, you’ll sit nearer the top; an average build just settles around the middle. Adjust for what you’re after, leaner sits lower in the range, strength and sport sit higher, and neither is more correct. Then sanity-check against your body fat: if your goal weight only works at a body fat percentage you’ll never realistically hold, change the goal, not your willpower.

Once you’ve got a target, give it time. A sane rate of change is half a pound to a pound a week; push harder than that and you start shedding muscle and water instead of fat, which is why “lost 30 pounds in eight weeks” stories so often end in regain. The slow route, which usually just means a modest calorie deficit you can actually live with, wins out in the end. The scale just moves less dramatically while it does.

The Number Was Never the Point

I still think about that strip of tape. The fix for him wasn’t a better number; it was peeling the tape off the door. Once he saw he was already inside a healthy range, the whole project changed from chasing a verdict to just picking a target, lower if he wanted to look lean, higher because he liked being strong, and both were fine. That’s the quiet freedom buried under all the ideal-weight calculators: the single right number you’ve been hunting doesn’t exist, which means you were never actually failing to reach it. You get to pick a sensible spot in your range and let your composition, not the scale, tell you how it’s going.

FAQ

Which ideal-weight formula is the most accurate?

None, honestly. Devine, Robinson, Miller, Hamwi each land on a slightly different number, and not one of them knows a thing about your body composition. You’re better off reading all four as one fuzzy cluster, then leaning on the healthy BMI range with a frame adjustment to sharpen it. That’ll beat trusting any single equation.

Should I trust the number my doctor gives me?

As a starting point, yes; as gospel, no. Most clinicians reach for Devine or plain BMI, both fine first passes but neither personalized to your muscle. If you carry real size, that number probably undersells your healthy weight, so bring it up. Most doctors are glad to factor in composition once you ask.

Is there a separate ideal weight for women?

The formulas do run lower for women, because women naturally carry less muscle and more essential fat, and that essential fat is doing important work, not something to diet away. The rule holds either way: frame and composition tell you far more than the raw number.

I’m above my “ideal” weight but I feel fine. Am I?

Quite possibly. BMI runs high on muscular people and low on skinny-fat ones, so the label by itself settles nothing. Go get your body fat measured and some bloodwork done, wrap a tape around your waist while you’re at it, and trust that fuller picture over any formula. For what it’s worth, a BMI parked above 30 does push risk up in a way worth taking seriously; the 25-to-30 stretch is murkier, especially if you’re active.

Medical Disclaimer: This article is for informational purposes only and isn’t medical advice. Healthy weight ranges vary with age, ethnicity, muscle mass, and existing health conditions. Please talk with a qualified healthcare professional for guidance tailored to you, especially before starting any weight-loss or weight-gain plan, and reach out to a doctor or registered dietitian if thinking about your weight has started to feel distressing or all-consuming.

What Is Your Ideal Body Weight? The Real Answer (Not Just a Number)