Ideal Weight Calculator (kg)
Enter your height and sex to estimate ideal body weight in kilograms using common clinical formulas.
What is an ideal weight calculator in kg?
An ideal weight calculator in kg gives you a practical target weight based on your height and sex. Instead of guessing, it uses established formulas to estimate a healthy body weight for adults. The result is shown in kilograms, which is useful for people using metric units.
How this calculator works
This tool converts your height from centimeters to inches and applies four widely used ideal body weight formulas. It then shows:
- Formula-specific estimates (Devine, Robinson, Miller, Hamwi)
- An average ideal weight across formulas
- A healthy BMI-based weight range for your height
These numbers are estimates, not strict rules. Real health also depends on body composition, activity level, age, and medical history.
Formulas used in this ideal body weight calculator
1) Devine Formula
Commonly used in medical settings, especially for medication-related dosing estimates.
- Male: 50 kg + 2.3 kg per inch over 5 feet
- Female: 45.5 kg + 2.3 kg per inch over 5 feet
2) Robinson Formula
A slightly lower estimate than Devine in many cases.
- Male: 52 kg + 1.9 kg per inch over 5 feet
- Female: 49 kg + 1.7 kg per inch over 5 feet
3) Miller Formula
Often produces moderate estimates and is useful as part of a multi-formula comparison.
- Male: 56.2 kg + 1.41 kg per inch over 5 feet
- Female: 53.1 kg + 1.36 kg per inch over 5 feet
4) Hamwi Formula
One of the older ideal weight methods but still frequently referenced.
- Male: 48 kg + 2.7 kg per inch over 5 feet
- Female: 45.5 kg + 2.2 kg per inch over 5 feet
How to use your result
Think of your calculated ideal weight as a guideline zone, not a pass/fail number. A healthy target is usually a range where you feel energetic, maintain good lab values, and can sustain your habits long term.
- If your current weight is above the estimate, aim for gradual fat loss.
- If your current weight is below the estimate, focus on nutrition and strength to build lean mass.
- If you are close to the range, prioritize consistency over aggressive changes.
Important limitations
No ideal weight calculator can fully account for differences in muscle mass, bone structure, ethnicity, or athletic training. For example, a very muscular person may be healthy at a weight above formula targets.
If you have a chronic condition (such as kidney disease, heart disease, diabetes, or thyroid disorders), use this as a starting point and discuss personal targets with your doctor or dietitian.
Practical next steps after calculating ideal weight
Set a realistic goal
Use the average estimate and BMI range to set a target window, not a single number.
Track trend, not daily fluctuation
Check your weekly average weight instead of reacting to day-to-day changes.
Support with lifestyle habits
- Protein-rich meals and fiber intake
- Strength training 2-4 times per week
- Daily movement and adequate sleep
- Stress management and hydration
Frequently asked questions
Is ideal weight the same as healthy weight?
Not exactly. Ideal weight formulas give a reference point. Healthy weight also includes body fat percentage, fitness, and medical markers.
Can I use this calculator if I am under 18?
You can, but adult formulas are less accurate for children and teens. Pediatric growth charts are better for younger age groups.
Why are there multiple formula results?
Each formula was developed from different datasets and assumptions. Showing several results gives a more balanced estimate.