Member Login
Follow Us

Teacher Lesson Plan - BMI for Kids - Body Mass Index

Aug 30, 2008
About this Lesson Plan
  • Subject: Health/Nutrition/Computer skills
  • Duration: 20-30 minutes
  • Grades: K-5
  • Ages: 4-13
  • Reading Levels: Basic
  • Prerequisite Knowledge and Skills: Basic knowledge of the My Plate or Food Pyramid, Basic computer & mouse skills, Hand-eye coordination

BMI Calculator for Kids Lesson Plan

Positive Healthy Messages


Topic/task Objective Domain and Level
Promote healthy 
nutrition messages
Students will listen to Katlin’s healthy
message about healthy eating and daily
exercise using the BMI calculator.
Affective – Receiving
Promote healthy lifestyle
Students will explain ways to keep their
body healthy after listening the the BMI
Cognitive – Comprehension
Promote the enjoyment
of nutrition
Students will see the character grow and 
shrink as they increase/decrease height
Affective – Receiving
Reinforce mouse skills
Students will enter information using the
Psychomotor – Coordination


Katlin’s Magical Messages Game:
A BMI calculator designed for children in elementary school. In order to hear a message the student must enter in their age, gender, height and weight. Younger children may need help with height and weight information and entering this data.
Height and weight information are both displayed in Apothecary system (inches, pounds) and the Metric system.
As the student enters in their height information, they will see the character get taller or smaller. Once the information is entered, the student will hear a positive message (audio and written text) about nutrition, how to eat healthy and exercise.
Students will not see a percentage or any number. Instead the student will see a color and hear a positive healthy message promoting healthy eating and daily exercise. There are four different colored messages a student can receive depending on whether they are:
  • underweight - the message will be displayed in purple
  • normal weight - the message will be displayed in green
  • overweight - the message will be displayed in yellow
  • obese - the message will be displayed in red
These messages were written by our dietitian and focus on healthy eating and daily exercise. We do not use any words that indicate "weight" or body image. There is a Parents' and Educators' BMI calculator that provides a BMI score and percentile.
Read the nutrition messages specific to a Body Mass Index.

Computer and Internet access, the latest Flash and Shockwave players installed, download free from Adobe

Teaching Tips:
Have the student review the Interactive Food Pyramid or My Plate.
Learn more about BMI to age percentiles.
  1. Have the students discuss in small groups ways to help their body grow tall and write them down. Topics would focus on nutrition, balanced meals, food groups, healthy foods that are packed with vitamins and minerals and exercise. (For younger students that can be done as a class discussion)
  2. Have the students share their ideas with the class.
  3. Discuss the importance of daily exercise.
  4. Guide the students to Katlin’s Magical Messages where they will enter in their age, gender, height and weight and receive a healthy message. Younger child may need help entering in height and weight.
Have the child track their activity for one week, using our Weekly Activity Tracker.
Turn in their sheet at the end of the week.
Have the children share the activities they did to reach at least 60 minutes a day.

Back to Page for Lesson Plans For Healthy Messages Games

Back to Main Page for Nutrition Lesson Plan Page


Written on Aug 30, 2008Last updated on Jul 31, 2012




The photos displayed on this website were purchased legally from,, and All clipart displayed on this website is the exclusive property of