What it calculates
There is no single ideal weight. This calculator gives a healthy range based on BMI and, for comparison, four long-established formulas originally developed for clinical use.
How it works
The BMI range multiplies the square of your height in metres by the BMI boundaries. Each formula adds a fixed amount per inch of height above five feet to a base weight.
Formula
Range = 18.5 × h² to 24.9 × h² (h in metres)
- Devine: 50 kg (men) / 45.5 kg (women) + 2.3 kg per inch over 5 ft
- Robinson, Miller and Hamwi use different base weights and increments
How to use it
- Choose the sex used by the formulas.
- Enter your height.
- Compare the BMI range with the formula estimates.
For the default height of 165 cm (female formulas):
Why it helps
- Gives a range rather than a single number.
- Shows how different methods compare.
Limitations
- Ignores frame size, muscle mass and age.
- The named formulas are not valid below 5 feet.
Frequently asked questions
Which formula is best?
None is definitive. The BMI range is the most widely used; the formulas are shown for reference.
Do you store what I enter?
No. This calculator runs entirely in your browser. Your measurements and dates are not sent to or stored on our servers.
Sources
- Obesity and overweight — fact sheet (BMI classification) — World Health Organization (checked 2026-09-27)
This calculator gives a general estimate only. It is not medical advice, a diagnosis or a treatment plan, and it does not replace a consultation with a doctor or registered dietitian. Your inputs stay in your browser and are not stored by UrbanFiling.