# Golang : Calculate BMI and risk category

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I'm building a healthcare IoT device that will ask a person about their weight and report back the risk category. Eventually, the plan is to stop asking the question and take the weight measurement from a pressure sensor and display the risk category on a display. For now, let's get the basic right first. To calculate BMI(Body Mass Index), the formula is BMI = mass / height * height where mass is in kilograms and height is in meters and the health risk categories are : Underweight < 18.5 Normal >= 18.5 and < 25 Overweight >= 25 and < 30 Obese >= 30 Here you go! package main import ( "fmt" "math" ) var ( weight, height, bmi float64 ) func main() { fmt.Println("Enter your weight in kilograms : ") fmt.Scanf("%f", &weight) fmt.Println("Enter your height in meters : ") fmt.Scanf("%f", &height) fmt.Println("You have entered weight of : ", weight) fmt.Println("You have entered height of : ", height) bmi = weight / math.Pow(height, 2) fmt.Println("Your BMI is : ", bmi) fmt.Print("Your risk category is : ") if bmi < float64(18.5) { fmt.Println("Underweight") else if bmi < 25 { fmt.Println("Normal weight") else if bmi < 30 { fmt.Println("Overweight") else { fmt.Println("Obese") // calculate normal weight based on height and bmi = 25 normalWeight := 25 * math.Pow(height, 2) delta := weight - normalWeight fmt.Printf("The normal weight for your height is : %0.2v kilograms.\n", normalWeight) if (delta > 0) && (bmi > 30) { fmt.Printf("You need to reduce %0.2v kilograms.\n", math.Abs(delta)) if (delta < 0) && (bmi < float64(18.5)) { fmt.Printf("You need to increase %0.2v kilograms.\n", math.Abs(delta)) Sample output: Enter your weight in kilograms : 100 Enter your height in meters : 1.7 You have entered weight of : 100 You have entered height of : 1.7 Your BMI is : 34.602076124567475 Your risk category is : Obese The normal weight for your height is : 72 You need to reduce 28 kilograms. Happy coding!

#### See also : Golang : Calculate diameter, circumference, area, sphere surface and volume

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##### By Adam Ng

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