🏆 Medical-Grade Accuracy

Ideal Weight Calculator 2025

Calculate your ideal body weight instantly with our medically accurate, free calculator using 4 proven formulas trusted by healthcare professionals worldwide. Get comprehensive IBW assessment and health insights.

1M+ Healthcare Users
4.9★ Average Rating
4 Proven Formulas

Calculate Your Ideal Weight

Enter your details to get instant, medically accurate ideal body weight calculations using 4 proven formulas

years
Age 2-80 for enhanced recommendations
cm
Required for all IBW calculations
Based on wrist circumference relative to height

Your Ideal Body Weight

Robinson (1983)
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Most commonly used
Miller (1983)
--
Conservative estimate
Devine (1974)
--
Medical standard
Hamwi (1964)
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Original formula
Healthy BMI Range
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WHO standard (BMI 18.5-25)

Body Frame Guidelines

Women

Under 5'2":
Small: < 5.5" Medium: 5.5" - 5.75" Large: > 5.75"
5'2" - 5'5":
Small: < 6" Medium: 6" - 6.25" Large: > 6.25"
Over 5'5":
Small: < 6.25" Medium: 6.25" - 6.5" Large: > 6.5"

Men

Over 5'5":
Small: 5.5" - 6.5" Medium: 6.5" - 7.5" Large: > 7.5"
Measurements refer to wrist circumference

IBW Formulas

Formula Male Female
Robinson (1983) 52 + 1.9×(H-60) 49 + 1.7×(H-60)
Miller (1983) 56.2 + 1.41×(H-60) 53.1 + 1.36×(H-60)
Devine (1974) 50 + 2.3×(H-60) 45.5 + 2.3×(H-60)
Hamwi (1964) 48 + 2.7×(H-60) 45.5 + 2.2×(H-60)
H = Height in inches above 5 feet (60 inches). Results in kg.

⚠️ Medical Disclaimer

This ideal weight calculator is for informational purposes only. IBW formulas don't consider muscle mass, body composition, or individual health factors. Results should not replace professional medical evaluation. Always consult healthcare professionals for personalized weight management advice.

Understanding Ideal Body Weight (IBW)

Comprehensive guide to ideal body weight formulas, their applications, and what they mean for your health and wellness.

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What is IBW?

Ideal Body Weight (IBW) represents the optimal weight range for a person based on height and gender. Originally developed for medical dosage calculations, IBW formulas help estimate healthy weight ranges.

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Medical Origins

IBW formulas were created for calculating medication dosages in medical settings. The metabolism of certain drugs is more closely related to IBW than total body weight, making these calculations medically important.

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Formula Differences

Each formula uses different base weights and increments. Robinson and Miller are modifications of Devine's formula, while Hamwi is the original. Results can vary by 5-10 kg between formulas.

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Limitations

IBW doesn't consider muscle mass, bone density, or body composition. Athletes with high muscle mass may exceed IBW while being perfectly healthy. Use IBW as a general guideline, not absolute truth.

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Body Frame Impact

Body frame size significantly affects ideal weight. Large-framed individuals naturally weigh more than small-framed people of the same height. Frame size is determined by wrist circumference relative to height.

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Modern Applications

Today, IBW is used in sports classifications, medical dosing, and general health assessments. However, focus on overall health through proper nutrition, exercise, and lifestyle rather than achieving specific IBW numbers.

Frequently Asked Questions

Everything you need to know about ideal body weight calculations, formulas, and their practical applications answered by health experts.

Which IBW formula is most accurate?

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No single formula is universally most accurate. The Devine formula is most widely used in medical settings, while Robinson and Miller provide modified estimates. Consider the average of multiple formulas for a more comprehensive range.

Can I be healthy outside my IBW range?

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Absolutely! IBW formulas don't account for muscle mass, bone density, or individual body composition. Many healthy, fit individuals fall outside IBW ranges. Focus on overall health markers rather than just weight numbers.

How does body frame affect ideal weight?

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Body frame significantly impacts ideal weight. Large-framed individuals have bigger bones and more muscle mass, naturally weighing 10-15% more than small-framed people. Measure your wrist circumference to determine frame size.

Should athletes use IBW calculations?

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Athletes should use IBW with caution. High muscle mass can make healthy athletes appear "overweight" by IBW standards. Body composition analysis, performance metrics, and health markers are more relevant for athletic populations.

How does IBW change with age?

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IBW formulas don't account for age after physical maturity. However, body composition changes with age - muscle mass decreases while fat percentage may increase. Some weight gain with age can be normal and even protective in older adults.

Is IBW the same as healthy weight?

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Not necessarily. IBW provides estimates based on height and gender, while healthy weight encompasses broader factors like body composition, health markers, and individual circumstances. Use IBW as one reference point among many.