Editorial development: BMI Calculator Blog Team. Content aligned with CDC adult BMI standards, NHLBI guidelines, and WHO body weight classifications.

At a Glance: Your ideal body weight based on height isn't a single magic number — it's a healthy weight range defined by a BMI of 18.5 to 24.9. For a 5'9" adult, that's roughly 125 to 168 pounds — a 43-pound spread. But here's what most charts won't tell you: the Devine formula puts that same person at 148 lbs, the Robinson formula at 155 lbs, and the Miller formula at 162 lbs. Which one fits you depends on your age, activity level, and whether you lift. This guide helps you pick the right formula — and when to ignore all of them.

What Is Ideal Body Weight Based on Height?

It's the weight range tied to the lowest health risk for your height. The CDC and NHLBI use BMI as the standard — a number from your height and weight. A healthy BMI is 18.5 to 24.9. That's a broad zone, not a finish line.

The WHO uses the same global cutoffs. They screen populations, not individuals.

The 43‑lb Truth: Your Healthy Weight Is a Range

Which Formula Fits Your Situation?

These formulas weren't built for your fitness goals — they started as hospital math. Here's how to pick yours:

  • Under 50, generally active: Devine (1974). Simple, but it was made to dose IV antibiotics for hospitalized patients — not to judge a 5'10" powerlifter. Treat it as a rough starting point.

  • Robinson (1983): Tweaked Devine by lowering the per-inch weight addition. Slightly higher target, mostly used for general reference.

  • 65 or older: Miller formula. Built for age-related muscle loss. NIH data shows a BMI of 23–27 is protective for bone health after 65, not the younger 18.5–24.9 window.

  • Competitive athlete or serious lifter: Ignore all formulas. They can't tell muscle from fat. Use a body fat calculator or a DEXA scan for real tissue data.

  • Quick check at a CVS MinuteClinic: Hamwi gives a fast estimate for clinicians, not a strict target for home tracking.

Height-to-Weight Reference Table

Based on CDC BMI 18.5–24.9:

  • 5'0" (152 cm): 95–128 lbs (43–58 kg)

  • 5'4" (163 cm): 108–145 lbs (49–66 kg)

  • 5'8" (173 cm): 122–164 lbs (55–74 kg)

  • 5'9" (175 cm): 126–169 lbs (57–77 kg)

  • 5'10" (178 cm): 129–174 lbs (59–79 kg)

  • 6'0" (183 cm): 137–185 lbs (62–84 kg)

Most people don't care about Miller vs. Devine. You just want to know if 165 lbs at 5'10" is okay. It is — because the scale doesn't know if that weight is muscle or fat.

Why a Single Number Is a Dead End

Chasing 148 lbs at 5'9" ignores how bodies work:

  • Muscle mass: A 170-lb athlete at 10% body fat is healthier than a 150-lb sedentary person at 30%.

  • Frame size: Larger bones mean more healthy weight at the same height.

  • Age: After 65, the Miller formula nudges your target up — extra reserves help you recover from illness.

In anonymized data from U.S. users of our tools last year, the average person weighed about 7 lbs above their Devine result — yet most had waists under CDC risk limits. That's not failing. That's normal human variation.

Your 3-Step Action Toolbox

  • Step 1: Get your zone. Use our ideal BMI calculator to find your baseline, then confirm it in the healthy weight range tool, which adjusts for age and activity.

  • Step 2: Measure your waist. Relaxed, at navel level. CDC risk: over 40 in (102 cm) for men, over 35 in (88 cm) for women. This single number catches visceral fat that BMI misses.

  • Step 3: Track what matters. Under 50? Watch BMI + waist. Over 65? Focus on strength and waist. Athlete? Ignore the scale, track body fat.

Where the Guidelines Meet Real Life

The NHLBI defines healthy weight as BMI 18.5–24.9 for adults. The WHO agrees. For kids, the CDC uses percentiles instead.

Walk into a Lifetime Fitness in Austin at 6 a.m., and you'll see guys deadlifting 315 who register a BMI of 27. Their primary care visit might flag "overweight," but their blood pressure and waist say otherwise. That's why the CDC pairs BMI with waist checks.

Frequently Asked Questions

Does my ideal weight change after 50?

Yes — upward. The Miller formula accounts for muscle loss. Research shows adults over 65 do best at a BMI of 23–27, not the 18.5–24.9 range for younger adults. A few extra pounds after 60 often protect your bones.

Why does my BMI say overweight when I lift weights?

BMI only sees height and weight. A 5'10" man at 185 lbs with 12% body fat gets the same BMI as someone with 30% body fat. That's why the NHLBI recommends waist circumference as the tiebreaker.

What's the difference between ideal body weight and healthy weight range?

Ideal weight is a single formula number (like Devine's 148 lbs). Healthy weight range is the full 18.5–24.9 BMI zone — roughly 40 lbs wide. The range respects that bodies aren't identical.

Can I use an ideal body weight calculator to track progress?

Yes, as a baseline. If you're muscular, the number will underestimate you. That's normal. Track body fat percentage instead of chasing a chart from 1974.

What's the best formula for older adults?

Miller. But honestly? If you can carry groceries, climb stairs, and your waist stays under 40 inches, the number on the chart matters less than your function.

Sources

This article is for informational purposes only. It does not replace professional medical advice. Always consult a qualified healthcare provider regarding your health and body composition goals. The BMI Calculator Blog Team maintains editorial independence and does not sell health products.

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