ToolSpotAI

Free Ideal Weight Calculator

Find your ideal weight range using 5 scientific formulas (Devine, Robinson, Miller, Hamwi, BMI). Visual range bar included. This tool runs in your browser—no account required.

Health

Your Ideal Weight Range

66.5 kg – 72 kg

Average across all formulas: 69.3 kg

Weight Range Visualization

UnderweightHealthy rangeOverweight
56.7 kg76.3 kg

Results by Formula

FormulaIdeal Weight
Devine70.5 kg
Robinson68.9 kg
Miller68.7 kg
Hamwi72 kg
BMI Range66.5 kg(56.7 kg – 76.3 kg)

Formula Comparison

Devine70.5 kg
Robinson68.9 kg
Miller68.7 kg
Hamwi72 kg
BMI Range66.5 kg
Ideal weight varies significantly based on body composition, muscle mass, bone density, and individual health factors. These formulas provide general guidelines — they are not medical advice. Consult your healthcare provider for personalized recommendations.

How to Use This Ideal Weight Calculator

  1. Enter your height, gender, and optionally your current weight.
  2. The calculator computes ideal weight using all 5 formulas simultaneously and displays them in a comparison table and bar chart.
  3. A visual weight range bar shows underweight, healthy, and overweight zones.
  4. If you enter your current weight, it shows your BMI and how far you are from the ideal range.

What is Ideal Weight Calculator?

An ideal weight calculator estimates the healthy weight range for your height and gender using multiple established medical formulas. Rather than giving a single number, our calculator shows results from 5 different formulas, providing a range that accounts for individual variation. The calculator includes: Devine (most commonly used medically), Robinson (revised Devine), Miller (alternative estimate), Hamwi (clinical standard), and BMI-based range (18.5–24.9 BMI). You can also enter your current weight to see how you compare.

Formula

Devine: Male = 50 + 2.3 × (inches over 5ft), Female = 45.5 + 2.3 × (inches over 5ft)
Robinson: Male = 52 + 1.9 × (inches over 5ft), Female = 49 + 1.7 × (inches over 5ft)
Miller: Male = 56.2 + 1.41 × (inches over 5ft), Female = 53.1 + 1.36 × (inches over 5ft)
Hamwi: Male = 48 + 2.7 × (inches over 5ft), Female = 45.5 + 2.2 × (inches over 5ft)
BMI Range: Weight = BMI × height(m)², where BMI = 18.5 to 24.9

Formula Explained

All height-based formulas use a base weight at 5 feet tall and add a fixed amount per inch of additional height. They were developed from population studies in the 1970s–1990s. The Devine formula is the basis for most others. The BMI-based range is the most modern approach, recommended by the WHO, defining healthy as 18.5–24.9 kg/m².

Example

Male, 5'9" (175 cm): Devine: 73.0 kg (161 lbs) Robinson: 69.1 kg (152 lbs) Miller: 68.9 kg (152 lbs) Hamwi: 72.3 kg (159 lbs) BMI Range: 56.7–76.5 kg (125–169 lbs) Ideal range: 68.9–73.0 kg (152–161 lbs) Average: 70.8 kg (156 lbs)

Tips & Best Practices

  • ✓Focus on the weight range rather than any single number.
  • ✓Consider your body composition — muscle mass affects the numbers.
  • ✓BMI-based range is the broadest and most accepted by health organizations.
  • ✓Revisit your ideal weight as a reference point, not a strict target.
  • ✓Pair ideal weight knowledge with BMR/TDEE calculations for actionable diet planning.

Common Use Cases

  • •Setting realistic weight goals based on scientific formulas
  • •Understanding healthy weight ranges for your height and build
  • •Comparing your current weight against established benchmarks
  • •Discussing weight targets with your healthcare provider
  • •Pairing with BMR and calorie calculators for comprehensive health planning

Frequently Asked Questions

A single "ideal" weight is misleading because healthy weight depends on muscle mass, bone density, body composition, age, and ethnicity. Showing a range from multiple formulas gives a more realistic picture. The BMI-based range (18.5–24.9) is the broadest and most commonly referenced by health organizations.

Related tools