Healthy Weight Calculator | OmniCalculator

  • Adam
  • November 1, 2025

Free healthy weight calculator using BMI and multiple formulas (Devine, Robinson, Miller, Peterson). Calculate your ideal weight range based on height.

⚖️ 💪 ⚖️

Healthy Weight Calculator

Calculate your ideal healthy weight using BMI and multiple formulas. Find your target weight range based on height and gender.

📋 Quick Navigation

⚖️ Enter your information to find your healthy weight range! 💪
in cm (100-250)
in kg (30-300)
in cm (100-250)
for better estimates
Healthy Weight Range
0 - 0 kg
Based on your measurements

Your Height

175
cm

Current Weight

75
kg

Your BMI

24.5
kg/m²

Weight To Adjust

0
kg

Devine Formula

0
Classic formula used in medicine

Robinson Formula

0
Modified Devine, more accurate

Miller Formula

0
Good for extremes of height

Peterson Formula

0
Modern formula accounting for height variations

🧮 Ideal Body Weight Formulas

Devine Formula (1974)

The original formula developed for medical dosing, now widely used for fitness goals. It provides a simple height-based calculation.

Men: 50 kg + 2.3 kg per inch over 5' (152.4 cm)
Women: 45.5 kg + 2.3 kg per inch over 5' (152.4 cm)

Or in metric:
Men: 50 + 0.9 × (Height - 152) cm
Women: 45.5 + 0.9 × (Height - 152) cm

Robinson Formula (1983)

A modification of Devine that adjusts the baseline values. Often considered more accurate than the original Devine.

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

Miller Formula (1983)

Another Devine modification that may work better for people at height extremes.

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

Peterson Formula (Modern)

A newer formula that accounts for height variations using BMI targets. Considered one of the most accurate modern formulas.

Weight = 2.2 × BMI target + 3.5 × BMI target × (Height - 1.5 m)

Using BMI target of 22 (middle of healthy range 18.5-25):
Weight = 48.4 + 77 × (Height - 1.5)

BMI-Based Healthy Weight Range

Calculate the weight range for healthy BMI (18.5-25 kg/m²) using your height.

Minimum Weight = 18.5 × Height²
Maximum Weight = 25 × Height²

Height must be in meters. Example: 175 cm = 1.75 m
Min = 18.5 × 1.75² = 56.6 kg
Max = 25 × 1.75² = 76.6 kg

📊 Understanding BMI (Body Mass Index)

What is BMI?

Body Mass Index (BMI) is a measure of body fat based on height and weight. It's calculated by dividing weight (kg) by height squared (m²). While not perfect, it's widely used by health organizations as a quick screening tool.

BMI = Weight (kg) ÷ Height (m)²

Example: Person weighing 75 kg, 1.75 m tall
BMI = 75 ÷ (1.75 × 1.75) = 75 ÷ 3.0625 = 24.5 kg/m²

BMI Categories

Classification BMI Range Health Status
Underweight Below 18.5 May indicate insufficient weight or medical condition
Normal Weight 18.5 - 24.9 Healthy weight range recommended by WHO
Overweight 25.0 - 29.9 May indicate increased health risk
Obese Class I 30.0 - 34.9 Significant health risk indicated
Obese Class II 35.0 - 39.9 High health risk indicated
Obese Class III 40.0+ Very high health risk indicated

BMI Limitations

BMI doesn't account for body composition (muscle vs fat), age, ethnicity, or bone density. Athletes with high muscle mass may have "overweight" BMI despite low body fat. Conversely, sedentary people with high fat mass may have "normal" BMI. BMI should be used alongside other health indicators.

💡 Important: Healthy weight is a range, not a single number. Health depends on many factors including fitness level, body composition, genetics, and lifestyle, not just BMI or weight alone!

📐 Calculation Methods Comparison

Which Method Should I Use?

For most people: The BMI method is simple and widely accepted. For personalized estimates: Compare multiple formulas and average them. For athletes: Consider that muscle weighs more, so actual healthy weight may be higher than formulas suggest.

Formula Accuracy by Height

Height Range Best Formula Why
Short (< 160 cm) Peterson or BMI Formulas may underestimate
Average (160-180 cm) Any formula works well Formulas optimized for this range
Tall (> 180 cm) Peterson or Miller Better for height extremes

Factors Affecting Ideal Weight

  • Muscle Mass: Athletes may need higher weights
  • Age: Metabolism changes with age
  • Gender: Different body composition patterns
  • Genetics: Individual variation is significant
  • Fitness Level: Active individuals may weigh more
  • Health Status: Medical conditions affect ideal weight

❓ Frequently Asked Questions

What's the difference between weight and BMI? +
Weight is just a number (kg or lbs). BMI relates your weight to your height to assess if you're in a healthy range. Two people with the same weight can have different BMIs if they're different heights. BMI is more meaningful than absolute weight for health assessment!
Why do different formulas give different results? +
Different formulas were developed using different populations and at different times. Devine was from the 1970s, Robinson and Miller refined it in the 1980s, Peterson is a modern formula. They use different baseline values and multipliers. Averaging multiple formulas gives a better estimate than relying on one!
Should athletes use different calculations? +
Yes! Athletes often have high BMI or weight due to muscle mass, not fat. Muscle is denser than fat, so athletes may need higher weights. Consider body composition (% body fat) rather than BMI alone. Get professional assessment if you're very muscular or athletic!
Is there one "ideal" weight? +
No! Healthy weight is a range, not a single number. Different body types, muscle mass, genetics, and age all affect ideal weight. Two people of the same height and weight can have very different body compositions. Aim for a healthy weight range that feels good for your body!
How often should I recalculate my healthy weight? +
Your healthy weight range doesn't change unless your height changes (which it doesn't in adults). However, your current weight relative to this range may change. Check periodically if you've changed height significantly due to posture changes or aging, but your target range is essentially fixed!
What's more important: weight or health? +
Health is more important than weight! You can be at a high weight but very healthy if you're fit and have good body composition. Conversely, "normal" weight doesn't guarantee health. Focus on fitness, nutrition, sleep, and stress management rather than obsessing over a number on the scale!
How do I achieve and maintain a healthy weight? +
Combine balanced nutrition, regular physical activity, adequate sleep, and stress management. Aim for gradual changes (0.5-1 kg per week loss is healthy). Sustainable habits matter more than quick fixes. Consider working with a healthcare provider or nutritionist for personalized guidance!
Is BMI accurate for all populations? +
BMI works well for most adults but has limitations in certain groups. It overestimates body fat in muscular people and underestimates in elderly or sedentary people. Different ethnic groups may need adjusted BMI cutoffs. For children, special BMI-for-age charts are recommended. Always consider context!

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