Ideal Weight Calculator
Enter your sex and height to see four classic ideal body weight formulas side by side, plus the weight range that gives a healthy BMI of 18.5 to 24.9. Results show in kilograms and pounds, and it all runs in your browser.
Runs in your browser. Your files are never uploaded.
Loading Ideal Weight Calculator…
How to use Ideal Weight Calculator
- Choose male or female.
- Choose centimetres or feet and inches, and enter your height.
- Read the four formula results in kg and lb.
- Compare them with the healthy BMI weight range shown above them.
The four formulas
Each formula starts with a base weight for 5 feet of height and adds a set amount for every inch above 5 feet.
- Devine (1974): men 50 kg + 2.3 kg per inch, women 45.5 kg + 2.3 kg per inch. Originally used for drug dosing.
- Robinson (1983): men 52 kg + 1.9 kg per inch, women 49 kg + 1.7 kg per inch.
- Miller (1983): men 56.2 kg + 1.41 kg per inch, women 53.1 kg + 1.36 kg per inch.
- Hamwi (1964): men 48 kg + 2.7 kg per inch, women 45.5 kg + 2.2 kg per inch.
The healthy BMI range
BMI is weight in kilograms divided by height in metres squared. For your height, the tool multiplies height squared by 18.5 and by 24.9 to find the lowest and highest weight in the healthy band.
Using the results
If your weight falls inside the BMI range, you are likely fine whatever the formulas say. The formulas are a rough guide. Muscle, frame size, age and health matter more than any single number.
Limits
These are estimates only and not medical advice. The formulas are for adults and ignore age, muscle and body build. Talk to a doctor or dietitian before changing your weight. Calculation happens in your browser and nothing is uploaded.
Why use this ideal weight calculator tool
- Four formulas. Devine, Robinson, Miller and Hamwi results are shown together so you can see how much they differ.
- Healthy BMI range. See the lowest and highest weight for your height that give a BMI from 18.5 to 24.9.
- kg and lb. Every result is given in both kilograms and pounds, and height can be entered in cm or feet and inches.
- Private and free. Everything is calculated in your browser. Nothing is uploaded, and there is no account or sign-up.
Frequently asked questions
What is my ideal weight for my height?
It depends on the method. The four formulas here give slightly different answers for the same height, and the healthy BMI range gives a wider band. Treat the overlap as a sensible target, not an exact number.
Which ideal weight formula is the most accurate?
None is clearly best. They were written for different purposes, such as drug dosing, and they ignore muscle, bone size and age. That is why this tool shows all four together with the BMI range.
What is a healthy BMI range?
A BMI from 18.5 to 24.9 is the range commonly called healthy for adults. The tool turns it into a weight range for your height. BMI does not measure body fat, so athletes and older adults may differ.
Do the formulas work for short or tall people?
They were built around heights above 5 feet, adding a set amount for each inch over 5 feet. This tool accepts 120 to 230 cm, but the results for very short or very tall people are less reliable.
Is my height stored anywhere?
No. The numbers stay in your browser and are not uploaded or saved.
More free tools
Calorie and BMR Calculator
Estimate your basal metabolic rate with the Mifflin-St Jeor equation, daily calories for your activity level, and calorie targets for losing or gaining weight.
Open toolPregnancy Due Date Calculator
Estimate your due date from the first day of your last period (with cycle length) or conception date, see weeks pregnant today and trimester dates.
Open toolFraction Calculator
Free fraction calculator for mixed numbers and fractions. Add, subtract, multiply or divide and get the simplified fraction, mixed number, decimal and steps.
Open tool