ExerciseBikeKcalToWh.java

package com.helospark.bike;

/**
 * Calculates how many watts I have to generate to burn the amount of calories on my exercise bike generator.
 * @author helospark
 */
public class ExerciseBikeKcalToWh {
    static final int kcalEaten = 640;

    public static void main(String[] args) {
        final double muscleEfficiency = 0.2;
        final double generatorEfficiency = 0.8;
        final double kcalToWh = 1.163;
        final double avgWatts = 100.0;

        double whGenerated = kcalEaten * (kcalToWh * muscleEfficiency * generatorEfficiency);
        double timeToGenerate = whGenerated / avgWatts;

        System.out.printf("%.2f Wh\n", whGenerated);
        System.out.printf("%d min\n", (int) (timeToGenerate * 60));
    }

}