Ideal Body Weight Calculator

INTRODUCTION

You stepped on the scale.

It read 185 pounds.

You looked at a BMI chart. It said your "healthy weight" is 128–174 pounds.

You felt confused. You lift weights. Your shoulders are broad. Your legs are muscular.

At 165 pounds, you looked skinny. At 185, you look athletic.

Is 185 too heavy? Is 165 your goal? Or should you aim for 200?

You asked your doctor. They said: "Lose 20 pounds."

You asked your trainer. They said: "You need to gain 10 pounds of muscle."

You asked the internet. It said: "Ideal weight is a social construct."

None of these answers helped.

Here is the truth: There is no single ideal weight for everyone.

A 5'10" marathon runner and a 5'10" powerlifter have completely different "ideal" weights.

One carries 145 pounds of lean endurance muscle.

The other carries 195 pounds of explosive strength.

Both can be healthy. Both can be "ideal" for their goals.

But there are scientific frameworks that estimate a healthy weight range based on height, gender, and frame size.

These formulas were developed by doctors, not Instagram influencers.

They account for:

• Height — taller people weigh more

• Gender — men typically have more muscle mass

• Frame size — small, medium, or large bone structure

• Age — body composition shifts over decades

They do not account for:

• Muscle mass — a bodybuilder will exceed every formula

• Body fat percentage — two people at the same weight look completely different

• Individual genetics — some people thrive at weights outside the range

An Ideal Body Weight Calculator gives you a starting point. A reference range. Not a prison.

In 2026, with weight-loss drugs, body image crises, and conflicting advice everywhere, knowing your scientifically estimated healthy weight is not optional.

It is essential for every adult who wants health, not just a number on a scale.

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WHAT IS AN IDEAL BODY WEIGHT CALCULATOR?

An ideal body weight calculator is a tool that estimates a healthy weight range for your height and gender using validated medical formulas.

It does not tell you what you "should" weigh for aesthetics.

It tells you what doctors historically consider a healthy, sustainable weight for your frame.

It uses multiple formulas because "ideal" is not one number:

• Devine Formula (1974) — Most widely used in medicine. Developed for drug dosing. Simple and practical.

• Robinson Formula (1983) — Updated Devine with more granular height adjustments.

• Miller Formula (1983) — Alternative to Devine, slightly different coefficients.

• Hamwi Formula (1964) — One of the earliest. Still used in clinical settings.

• BMI-Based Range — 18.5–24.9 BMI converted to weight for your height.

• Frame-Adjusted Range — Adjusts IBW by small, medium, or large frame size.

Standard inputs:

• Gender (male/female — formulas differ significantly)

• Height (feet/inches or cm)

• Frame size (optional — wrist circumference relative to height)

• Age (optional — some calculators adjust for metabolic shifts)

• Current weight (optional — to show distance from ideal range)

Outputs you get:

• Ideal Body Weight (IBW) from each formula

• Average IBW across formulas

• Healthy weight range (IBW ± 10%)

• Frame-adjusted IBW (small frame −10%, large frame +10%)

• BMI at IBW (should fall within 18.5–24.9)

• Current weight vs ideal comparison

• Pounds/kg to lose or gain to reach range

It answers the questions every adult asks:

"What should I actually weigh?"

"Is my weight healthy for my height?"

"How much should I lose to be in a healthy range?"

"Why do I look different from someone at the same weight?"

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HOW TO USE THE NUMOVIX IDEAL BODY WEIGHT CALCULATOR

Our calculator gives you instant, medically referenced weight ranges in under 30 seconds.

Step 1:

Select your gender.

Example: Male

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Step 2:

Enter your height.

Example: 5 feet 10 inches (70 inches / 178 cm)

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Step 3:

Measure your wrist circumference to determine frame size (optional).

Example: 7.0 inches

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Step 4:

Enter your current weight (optional, for comparison).

Example: 185 pounds

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Step 5:

Click "Calculate Ideal Weight."

You will instantly see:

Example: Male, 5'10", wrist 7.0", current weight 185 lbs

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Frame Size Determination:

| Method | Calculation | Result |

| Wrist ÷ Height (inches) | 7.0 ÷ 70 = 0.100 | Medium frame |

| Wrist circumference | 6.5"–7.5" for 5'10" male | Medium frame |

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Ideal Body Weight by Formula:

| Formula | IBW (lbs) | IBW (kg) |

| Devine | 161.4 | 73.2 |

| Robinson | 156.5 | 71.0 |

| Miller | 155.3 | 70.4 |

| Hamwi | 160.0 | 72.6 |

| Average | 158.3 | 71.8 |

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Healthy Weight Range (IBW ± 10%):

• Lower bound: 142.5 pounds (64.6 kg)

• Upper bound: 174.1 pounds (78.9 kg)

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Frame-Adjusted Range:

• Small frame (−10%): 128.3 – 156.7 pounds

• Medium frame: 142.5 – 174.1 pounds

• Large frame (+10%): 156.7 – 191.5 pounds

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Current Weight Analysis:

• Current: 185 pounds

• Above upper bound by: 10.9 pounds

• Above average IBW by: 26.7 pounds

• BMI at current weight: 26.6 (slightly overweight)

• BMI at average IBW: 22.8 (healthy)

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Example: Female, 5'6", wrist 6.0", current weight 155 lbs

Frame Size: Medium (5.5"–6.5" for 5'6" female)

| Formula | IBW (lbs) | IBW (kg) |

| Devine | 130.1 | 59.0 |

| Robinson | 130.7 | 59.3 |

| Miller | 129.6 | 58.8 |

| Hamwi | 130.0 | 59.0 |

| Average | 130.1 | 59.0 |

Healthy Range: 117.1 – 143.1 pounds

Current weight: 155 pounds

• Above upper bound by: 11.9 pounds

• BMI: 25.0 (borderline overweight)

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THE MATH BEHIND IDEAL BODY WEIGHT

Understanding the formulas helps you interpret results and discuss them with your doctor.

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Devine Formula (1974):

For Men:

IBW (kg) = 50 + 2.3 × (Height in inches − 60)

For Women:

IBW (kg) = 45.5 + 2.3 × (Height in inches − 60)

Example (Male, 5'10" = 70 inches):

50 + 2.3 × (70 − 60)

50 + 2.3 × 10

50 + 23 = 73.0 kg = 160.9 lbs

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Robinson Formula (1983):

For Men:

IBW (kg) = 52 + 1.9 × (Height in inches − 60)

For Women:

IBW (kg) = 49 + 1.7 × (Height in inches − 60)

Example (Male, 70 inches):

52 + 1.9 × 10 = 52 + 19 = 71.0 kg = 156.5 lbs

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Miller Formula (1983):

For Men:

IBW (kg) = 56.2 + 1.41 × (Height in inches − 60)

For Women:

IBW (kg) = 53.1 + 1.36 × (Height in inches − 60)

Example (Male, 70 inches):

56.2 + 1.41 × 10 = 56.2 + 14.1 = 70.3 kg = 155.0 lbs

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Hamwi Formula (1964):

For Men:

IBW (lbs) = 106 + 6 × (Height in inches − 60)

For Women:

IBW (lbs) = 100 + 5 × (Height in inches − 60)

Example (Male, 70 inches):

106 + 6 × 10 = 106 + 60 = 166 lbs

(Note: Hamwi tends to give slightly higher results for men.)

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BMI-Based Healthy Weight Range:

BMI = Weight (kg) ÷ Height (m)²

Healthy BMI range: 18.5 – 24.9

For 5'10" (1.778 m):

• Lower: 18.5 × 1.778² = 58.5 kg = 129 lbs

• Upper: 24.9 × 1.778² = 78.7 kg = 173.5 lbs

Range: 129 – 174 pounds

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Frame Size Adjustment:

Measure wrist circumference at the narrowest point.

Adjustment: Small frame −10%, Large frame +10%

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Complete Real Example:

Rohan's Weight Journey:

Starting Point:

• Gender: Male

• Height: 5'11" (71 inches)

• Weight: 210 pounds

• Wrist: 7.2 inches (medium frame)

• Age: 34

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Calculator Results:

| Formula | IBW |

| Devine | 163.6 lbs |

| Robinson | 158.3 lbs |

| Miller | 156.6 lbs |

| Hamwi | 172.0 lbs |

| Average | 162.6 lbs |

Healthy Range (±10%): 146.3 – 178.9 pounds

Current: 210 pounds

• Above upper bound by: 31.1 pounds

• BMI: 29.3 (overweight)

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Month 1–3: Diet Only, No Exercise

Rohan drops to 195 pounds.

BMI: 27.2. Still above range.

But he looks "skinny fat." No muscle. Flat posture.

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Month 4–8: Adds Resistance Training

Rohan stays at 195 pounds. Scale does not move.

But waist drops 3 inches. Chest and shoulders fill out.

He recalculates:

• Body fat: 18% (down from 28%)

• Lean mass: 160 lbs (up from 151 lbs)

• Fat mass: 35 lbs (down from 59 lbs)

His IBW formulas say 162. But he carries 160 pounds of lean mass.

At 10% body fat, he would weigh 178 pounds — above the "ideal" range but healthier than ever.

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Rohan's Realization:

The IBW calculator gave him a reference point.

But his body composition told the real story.

He stopped chasing 162 on the scale.

He started chasing 10% body fat at 175+ pounds.

The calculator started his journey. It did not finish it.

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IDEAL BODY WEIGHT FORMULAS COMPARED

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WHY EVERY ADULT NEEDS AN IDEAL BODY WEIGHT CALCULATOR

1. Establish a Health Baseline

You do not know if 185 pounds is healthy or not until you know your range.

The calculator gives you a medical reference point.

Not a judgment. A starting line.

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2. Set Realistic Weight Goals

"I want to lose 50 pounds."

Calculator shows your healthy upper bound is only 15 pounds away.

Losing 50 might put you underweight, weak, and metabolically damaged.

Lose to the range. Then reassess with body composition.

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3. Challenge Distorted Self-Image

Social media shows 6% body fat and visible veins.

Your IBW range says 145–175 pounds at your height.

But you think you need to be 130 to be "acceptable."

The calculator anchors you to medical reality, not Instagram fantasy.

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4. Guide Medical Conversations

Your doctor says "lose weight."

You ask: "How much?"

Calculator gives you the number to discuss.

Is 20 pounds reasonable? Is 40 excessive?

Data makes the conversation productive.

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5. Recognize When Weight Is Not the Problem

You are 5 pounds above your IBW range.

But your body fat is 12%. Your bloodwork is perfect. You deadlift twice your weight.

You do not have a weight problem.

The calculator shows you are near range. Body composition tools show you are elite.

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KEY FACTORS THAT AFFECT IDEAL WEIGHT

Muscle Mass:

IBW formulas assume average muscle.

A bodybuilder at 5'10" and 200 pounds with 10% fat is "overweight" by every formula.

But they are healthier than a 160-pound sedentary person at 25% fat.

Use IBW as a starting point. Verify with body fat %.

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Age:

Metabolism slows. Muscle declines. Weight redistributes.

A 25-year-old and 55-year-old at the same height may have different healthy ranges.

Some calculators adjust IBW down by 2–5% per decade after 40.

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Frame Size:

Small-boned people naturally weigh less.

Large-boned people naturally weigh more.

A 5'10" man with a 6.2" wrist vs an 8.0" wrist could have 20-pound different "ideals."

Always measure wrist and adjust.

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Ethnicity:

Some populations have different body composition at the same BMI.

Asian populations may have higher metabolic risk at lower BMIs.

Pacific Islander populations may carry more muscle at higher weights.

IBW is a general guide. Individual variation matters.

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Pregnancy and Lactation:

IBW does not apply during pregnancy.

Healthy weight gain: 25–35 pounds for normal BMI women.

Postpartum weight retention varies. Use IBW 6+ months after delivery.

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Athletic Training:

Endurance athletes often run lighter than IBW.

Strength athletes often exceed IBW.

Both can be healthy. Both can be "ideal" for performance.

IBW is a health reference, not a performance target.

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COMMON MISTAKES PEOPLE MAKE

Mistake 1: Treating IBW as a Mandatory Target

Calculator says 160. You are 185. You starve to 160.

But you lost 15 pounds of muscle and 10 pounds of fat.

You look worse. Feel worse. Metabolism crashed.

IBW is a range, not a commandment.

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Mistake 2: Ignoring Frame Size

You have a large frame. Wrist 8 inches. Broad shoulders.

Calculator says 160. But your frame-adjusted range tops at 176.

You force yourself to 160. You look gaunt. Your energy crashes.

Measure your wrist. Adjust for your frame.

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Mistake 3: Comparing to Others

Your friend is 5'10" and 150. You are 5'10" and 175.

They are a runner. You lift weights.

Both are healthy. Both are in range.

Do not use someone else's number.

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Mistake 4: Using IBW Alone for Drug Dosing

Doctors use IBW for some medication calculations.

But obese patients may need adjusted dosing.

Never self-dose based on calculator results.

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Mistake 5: Not Updating as Body Composition Changes

You started at 200 pounds, 30% fat.

Now you are 185 pounds, 15% fat.

Your "excess weight" by IBW is 20 pounds.

But your body fat is now athletic.

Recalculate body fat. Reassess goals.

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Mistake 6: Obsessing Over a Single Number

Devine says 161. Robinson says 156. Hamwi says 166.

Which is right?

All of them. None of them.

They are estimates. The average matters. The range matters.

Not the exact pound.

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Mistake 7: Using IBW to Justify Unhealthy Habits

You are 120 pounds at 5'10". BMI 17.2. Underweight.

But you say: "I am within range. I am fine."

No. Being underweight carries risks: osteoporosis, infertility, immune weakness.

Both ends of the spectrum matter.

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PRO TIPS TO USE IBW EFFECTIVELY

Tip 1: Calculate All Formulas, Use the Average

Do not pick the one you like.

Run Devine, Robinson, Miller, Hamwi. Average them.

That average is your most reliable estimate.

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Tip 2: Measure Wrist for Frame Adjustment

Wrist circumference does not change with fat or muscle gain.

It is a stable indicator of bone structure.

Use it. Adjust your range.

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Tip 3: Pair IBW with Body Fat Percentage

IBW tells you weight range.

Body fat % tells you what that weight is made of.

Together, they tell the full story.

At 175 pounds and 12% fat? You are lean and muscular.

At 175 pounds and 28% fat? You have work to do.

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Tip 4: Set Range Goals, Not Number Goals

"I want to be 160" becomes "I want to be 155–165."

Range goals reduce obsession. They allow for normal fluctuation.

Water weight alone shifts 2–5 pounds daily.

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Tip 5: Reassess Every 3 Months

As you lose fat and gain muscle, your composition changes.

Your "ideal" may shift. Your goals should evolve.

Recalculate body fat. Revisit your IBW range.

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Tip 6: Consider Performance Goals Alongside Health

You are a powerlifter. Your IBW range tops at 175.

But you compete at 198. You are healthy. You are strong.

Health and performance sometimes diverge.

Know your medical range. Choose your athletic range.

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Tip 7: Use IBW to Start Conversations with Professionals

Bring your calculator results to your doctor, dietitian, or trainer.

It shows you have done homework. It gives them data.

They can refine it with clinical context.

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QUICK SUMMARY

Before you use the calculator, remember these key points:

• Ideal body weight is an estimate, not a single mandatory number

• Multiple formulas exist — Devine, Robinson, Miller, Hamwi — average them

• Frame size matters — measure wrist and adjust range by ±10%

• Healthy weight range = IBW ± 10% — not one exact pound

• Muscle mass can push you above IBW while still being healthy

• Body fat percentage reveals what your weight is made of

• BMI range (18.5–24.9) should overlap with your IBW range

• Age, ethnicity, and athletic training shift what is healthy for you

• IBW is a starting point — verify with body composition and bloodwork

• Both underweight and overweight carry health risks

• Range goals beat number goals — allow for natural fluctuation

• Recalculate every 3 months as your body composition evolves

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FREQUENTLY ASKED QUESTIONS

Q1: Which ideal body weight formula is most accurate?

None is perfect. They all estimate.

• Devine is most widely used in medicine.

• Robinson is slightly more conservative.

• Miller gives the lowest estimates.

• Hamwi runs slightly higher for men.

Best practice: Calculate all four. Take the average. Use the ±10% range.

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Q2: Why do men and women have different formulas?

Men typically have:

• More muscle mass

• Larger bone structure

• Higher lean body mass at the same height

Women typically have:

• More essential fat (breast tissue, hips, reproductive organs)

• Lower average muscle mass

The formulas account for these physiological differences.

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Q3: Can I be healthy above my ideal body weight range?

Yes, if the extra weight is lean muscle.

A bodybuilder at 200 pounds and 10% body fat exceeds every IBW formula.

But their metabolic health, cardiovascular fitness, and longevity markers are excellent.

Use body fat % to verify. High weight + low fat = healthy.

High weight + high fat = elevated risk.

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Q4: What if I am below my ideal body weight?

Being underweight carries risks:

• Osteoporosis and bone fractures

• Weakened immune system

• Fertility issues

• Fatigue and hair loss

• Heart problems

If below range, consult a doctor. Do not celebrate.

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Q5: How does frame size affect ideal weight?

Small frame: Subtract 10% from IBW.

Large frame: Add 10% to IBW.

A 5'10" man with a 6" wrist might have an ideal range of 130–158.

A 5'10" man with an 8" wrist might have a range of 160–194.

20+ pounds of difference based on bone structure alone.

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Q6: Should athletes use ideal body weight formulas?

As a health reference, yes.

As a performance target, no.

Marathoners often run below IBW for speed.

Powerlifters often exceed IBW for strength.

Both can be healthy. Both should know their medical range.

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Q7: How often should I recalculate my ideal weight?

IBW based on height does not change.

But your healthy operating weight may shift as you:

• Gain or lose muscle

• Age and lose bone density

• Change activity levels

Recalculate body composition every 3 months. Reassess goals.

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RELATED CALCULATORS

Explore our full suite of free health and fitness tools:

• BMI Calculator

• Body Fat Percentage Calculator

• BMR Calculator

• TDEE Calculator

• Calorie Calculator

• Macro Calculator

• Lean Body Mass Calculator

• Water Intake Calculator

• Waist-to-Hip Ratio Calculator

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FINAL THOUGHTS

The scale gives you a number.

The mirror gives you an image.

Social media gives you a comparison.

But none of them give you a reference.

The Ideal Body Weight Calculator gives you that reference.

It says: "For your height, for your gender, for your frame — here is what medicine considers healthy."

It is not a verdict. It is not a sentence.

It is a starting line.

You might be above it with muscle. You might be below it with illness. You might be right in the middle and still unhappy with how you look.

That is okay. The calculator does not claim to solve body image.

It claims to give you data.

Data to discuss with your doctor.

Data to set your first goal.

Data to know when you are in a healthy range.

Data to stop chasing impossible numbers.

At 5'10", your IBW might be 160. But your best self might be 175 with abs and energy.

Or it might be 150 after years of sedentary life and a need to reset.

The calculator cannot tell you which. You know your body. Your bloodwork knows your health. Your body fat % knows your composition.

But the calculator gives you the map.

Use it to start. Use body fat to refine. Use performance to validate. Use how you feel to decide.

That is how you find your real ideal weight.

Not on a chart. Not on Instagram. In the intersection of science, self-awareness, and sustainable health.

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DISCLAIMER

This article is for educational and informational purposes only.

Ideal body weight formulas, healthy weight ranges, and BMI categories are general guidelines developed for population health screening and medical reference.

The examples provided are illustrative and based on standard anthropometric formulas (Devine, Robinson, Miller, Hamwi).

Actual healthy weight varies significantly by individual and depends on:

• Body composition (muscle vs fat ratio)

• Frame size and bone density

• Age and metabolic health

• Athletic training and performance goals

• Genetics and ethnicity

• Medical conditions and medications

Always consult a qualified healthcare provider, registered dietitian, or certified fitness professional before making weight loss or gain decisions.

Numovix does not provide medical advice, diagnosis, or treatment.

Our calculator results are estimates and should not replace professional medical assessment or personalized health guidance.

If you have concerns about your weight, eating habits, or body image, consult your healthcare provider immediately.

Ideal Body Weight Calculator | Calculate IBW, Healthy Weight Range & BMI | Numovix

Free ideal body weight calculator. Calculate your IBW using Devine, Robinson, Miller, and Hamwi formulas. Find your healthy weight range, frame-adjusted target, and BMI. No signup needed.