BMI Calculator For Children
The BMI Calculator For Children computes bmi from the relation BMI = weight in kg divided by (height in m x height in m). It takes 2 inputs (child weight in kg, child height in cm) and returns the bmi calculator for children. Because this is a pure mathematical or physical formula rather than a jurisdiction-specific rule, the result never changes over time: the same inputs always produce the same answer, so you can rely on it whether you are checking homework, sizing a design, or sanity-checking another tool. Enter your values in the fields below and the result updates instantly; you can also share a permalink that pre-fills the exact calculation, which is useful for teaching, reports, or collaboration. For example, with child weight = 45 kg, child height = 150 cm, the bmi calculator for children works out to 20, and the worked example further down the page shows every step so you can follow the arithmetic and reproduce it by hand. The method is the standard form documented by CDC Body Mass Index (BMI), and the figure above each result carries the date it was last verified. This tool is general information and is not a substitute for professional engineering, medical, financial, or scientific advice; always check critical results against the primary source and your own judgement.
With Child weight = 45 kg, Child height = 150 cm, the result is 20.
Applies to: any numeric inputs. Method source: CDC Body Mass Index (BMI), checked 2026-06-23.
The formula
BMI = weight in kg divided by (height in m x height in m)
Worked example
With Child weight = 45 kg, Child height = 150 cm:
- Convert height to metres: 1.50 m
- Divide weight by height squared: 45 / 2.2500 = 20.00
- BMI Calculator For Children = 20
This worked example is one of the automated golden-value tests this calculator must pass before it can publish.
What this assumes
- Inputs are real numbers in the units shown.
- The result is the exact value of BMI = weight in kg divided by (height in m x height in m); general information, not professional advice.
Frequently asked questions
What formula does this use?
BMI = weight in kg divided by (height in m x height in m), the standard form documented by CDC Body Mass Index (BMI).
Does the result ever change over time?
No. This is a pure formula with no external rate, so the same inputs always give the same result.
Official sources and verification
- Method: CDC Body Mass Index (BMI), checked 2026-06-23.
Reviewed by the CalculatorHub team, edited by James Graham, 2026-06-23. See our methodology. General information, not professional advice.