BMI Calculator for Students

Body Mass Index from height and weight, with metric / imperial units and a note on what BMI can and cannot tell you.

For the parts of student life that involve running numbers or hitting word limits: grade percentages, due dates, age gaps for group work, BMI for a health class, length checks against an assignment brief, and the formatting the rubric actually penalizes for. None of it leaves your device until you paste the answer in.

Open the BMI Calculator →

What it does for Students working on assignments and problem sets

How to use it

  1. Pick metric or imperial. The labels change but the math does not - both go through the same internal units.
  2. Enter height and weight. The BMI updates as you type, with the category pulled from the WHO table.
  3. Copy the result. The page also shows normal-range BMI for your height, useful when the brief asks for "a healthy BMI range for this height".

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Common questions

Is BMI worth using in a health or PE assignment?

As a screening formula it is a reasonable thing to describe, provided you also describe its limits: it treats height and weight as the whole picture, ignores muscle mass, frame and fat distribution, and was designed for populations rather than individuals. Present it as one indicator, not a diagnosis.

Which formula should I quote - metric or imperial?

They are the same formula with a conversion factor folded in, so quote the one your source uses and say which units you are working in. Converting between them introduces rounding, and a value carried across two unit systems can shift across a category boundary.

Should I round the result?

Report the value to the precision the task asks for, and do not re-classify after rounding. The category boundaries are conventions rather than physical thresholds, and a value sitting exactly on one will be described differently by different sources - so state which convention you used.