About the Handiwork BMI Calculator
The BMI Calculator computes your Body Mass Index from height and weight. Pick weight (kg or lb) and height (cm or ft/in) independently — so combinations like kilograms with feet and inches work naturally. It shows your BMI value, color-coded category, position on a visual scale, and the healthy weight range for your height — a quick screening snapshot, not a medical diagnosis.
How to use the Handiwork BMI Calculator
- Choose your weight and height units.
- Enter your measurements, or use Try example.
- Read your BMI, category on the scale, and copy a summary.
Understanding BMI categories
BMI groups adults into underweight (below 18.5), normal weight (18.5–24.9), overweight (25–29.9), and obese (30 and above). These ranges are population-level screening tools; muscle mass, age, and other factors are not reflected in BMI alone.
Healthy weight range
For your height, the calculator shows the weight range that corresponds to a BMI of 18.5 to 24.9. This gives a concrete target band, though individual health goals should always be discussed with a qualified provider.
Formula and rounding
BMI is weight in kilograms divided by height in meters squared: BMI = kg ÷ m². Imperial inputs are converted to kilograms and meters before the same formula is applied. The displayed BMI is rounded to one decimal place, while category comparisons use the unrounded result.
Assumptions and limitations
- The adult categories shown are intended for adults age 20 and older. Children and teenagers use age- and sex-specific BMI percentiles instead.
- BMI is a screening measure, not a diagnosis. It does not distinguish body fat from muscle and bone or show where fat is distributed.
- Pregnancy, athletic build, age, and individual medical circumstances can make BMI less informative. Discuss health decisions with a qualified clinician.
Sources and standards
These authoritative references were used to verify the method and guidance on this page.
Frequently asked questions
Is BMI accurate for athletes?
BMI does not distinguish muscle from fat, so very muscular people may score “overweight” despite low body fat. Treat BMI as one screening tool among many.
Which units can I use?
Choose weight in kilograms or pounds and height in centimeters or feet and inches separately — mix and match the units you actually use.
Is this a medical diagnosis?
No. BMI is a general screening metric, not a diagnosis. Talk to a healthcare provider about your health and weight goals.