Unminified script to get calories burned during exercise

calories_burned.js

/*
* Instructions:
* - Create a new bookmark and name it "Get Calories Burned!"
* - Then, paste the following code into the URL field.
* - At the prompt, enter your sex, age, weight, average heart rate during exercise, and exercise duration.
* - E.g.: m 38 150 150 30
* Data source: http://fitnowtraining.com/2012/01/formula-for-calories-burned/
*/
var getCalories = function() {
    var questions = prompt("Enter (separated by spaces):\n- Sex\n- Age (yrs)\n- Weight (lbs)\n- Avg heart rate (rpm)\n- Workout time (min)");
    var answers = questions.split(' ');
    var sex = answers[0];
    var age = answers[1];
    var weight = answers[2];
    var heart = answers[3];
    var time = answers[4];
    var calories_m = (((age * 0.2017) + (weight * 0.09036) + (heart * 0.6309) - 55.0969) * (time / 4.184)).toFixed(2);
    var calories_f = (((age * 0.074) + (weight * 0.05741) + (heart * 0.4472) - 20.4022) * (time / 4.184)).toFixed(2);
    var calories = (sex == "m") ? calories_m : calories_f;
    return calories;
}

var setCalories = function() {
    alert("You burned " + getCalories() + " calories today!");
}