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Weight Calculator

Find your ideal weight using 4 established clinical formulas, see your healthy BMI weight range, and compare against your current weight — all in one calculator.

✓ Free Forever ✓ 4 Clinical Formulas ✓ Instant Results

Advanced Weight Calculator

Please enter a valid gender and height to calculate.

The Science

Ideal Weight Formulas Compared

Your result above is an average of these four widely used clinical formulas, each developed for slightly different purposes over the last 60 years.

FormulaYearYour Result
Devine Formula1974--
Robinson Formula1983--
Miller Formula1983--
Hamwi Formula1964--
Average (shown above)—--

Fill the calculator above and hit Calculate to see your personal numbers instead of dashes.

Reference

The Equations Used

Devine Formula (Male / Female)

Men: 50 kg + 2.3 kg per inch over 5 feet Women: 45.5 kg + 2.3 kg per inch over 5 feet

Robinson Formula

Men: 52 kg + 1.9 kg per inch over 5 feet Women: 49 kg + 1.7 kg per inch over 5 feet

Miller Formula

Men: 56.2 kg + 1.41 kg per inch over 5 feet Women: 53.1 kg + 1.36 kg per inch over 5 feet

Hamwi Formula

Men: 48 kg + 2.7 kg per inch over 5 feet Women: 45.5 kg + 2.2 kg per inch over 5 feet
Worked Example

Step-by-Step Example

A 170 cm (5'7") male, using the Devine formula.

1
Convert height: 170 cm = 5 feet 7 inches (7 inches over 5 feet)
2
Base weight: 50 kg (male base)
3
Add per-inch adjustment: 7 × 2.3 kg = 16.1 kg
4
Total: 50 + 16.1 = 66.1 kg ideal weight (Devine)
Reference

Healthy BMI Weight Range by Height

Weight range corresponding to a healthy BMI of 18.5-24.9, by height.

HeightHealthy Weight Range
150 cm (4'11")41.6 - 56.0 kg
160 cm (5'3")47.4 - 63.7 kg
170 cm (5'7")53.5 - 71.9 kg
180 cm (5'11")59.9 - 80.6 kg
190 cm (6'3")66.8 - 89.9 kg
Reference Data

Average Adult Weight by Country

Approximate average adult male weight, based on published population health studies.

USA
89 kg
Germany
82 kg
UK
80 kg
China
68 kg
India
65 kg
Who Uses This

Common Ways People Use This Calculator

🏥
Fitness Goals
Set a realistic target weight
💪
Weight Loss
Plan a healthy weight loss journey
🌱
Weight Gain
Track progress toward your ideal weight
💉
Medical Dosing
Reference for clinical weight-based calculations
🧙
Sports
Compare against weight-class benchmarks
📈
Progress Tracking
Monitor weight changes over time
🎓
Health Education
Understand healthy weight ranges
🔍
Quick Check
Estimate your ideal body weight instantly
Get It Right

Tips for a Healthy Weight Journey

Use Ranges, Not Single Numbers

Ideal weight formulas provide estimates—aim for a healthy range rather than one exact number.

Track Trends, Not Daily Weight

Body weight naturally fluctuates due to food, water, and activity. Monitor weekly averages for better insights.

Combine with BMI and Body Fat %

Weight alone doesn't reflect body composition. Use BMI and body fat percentage for a more complete assessment.

Prioritize Strength and Health

Building muscle, staying active, and eating well are more important than reaching a specific number on the scale.

Measure Consistently

Weigh yourself at the same time of day, preferably in the morning, for more consistent and reliable results.

Focus on Sustainable Habits

Healthy eating, regular exercise, quality sleep, and hydration are the keys to maintaining your ideal weight.

Questions

Frequently Asked Questions

No single formula is universally "correct" — they were developed for different clinical purposes (mostly medication dosing). We average all four for a balanced estimate, but individual formulas can vary by a few kilograms.
Each was derived from a different reference population and study, decades apart — Hamwi (1964), Devine (1974), Robinson and Miller (both 1983) — so their base weights and per-inch adjustments differ slightly.
Both are population-based estimates rather than individual assessments. BMI range accounts for a broader healthy zone, while ideal weight formulas give a more specific target — using both together gives better context.
No. These formulas only use height and gender, so muscular individuals often weigh more than their "ideal weight" while still being healthy. Body fat percentage is a better measure for athletic body types.
Use our calculator above for a personalised estimate, or check the Healthy BMI Weight Range table for a broader acceptable range at your height.
No, these formulas are designed and validated for adults. Children's healthy weight should be assessed using paediatric growth charts by a doctor.
This is common and not automatically a health concern — body composition, muscle mass, frame size, and individual variation all mean actual healthy weight varies more than any single formula suggests.
No. All calculations run in your browser — nothing you enter is sent to or stored on our servers.

Curious About Your Full Health Picture?

Pair your ideal weight with our other free calculators for a complete health snapshot.

✓ Weight ✓ BMI ✓ BMR ✓ Height