Calculating total number of calories burned
First, not the most important point but first to grab my attention, prefer static final instead of final static in the name of least surprise.

Make everything private that can be made private, as @maartinus said.

This is a constant so make it final also:

private static double value = 0.0175;


Also name value is too generic, use the term from the field if available, you can name it CALORIES_PER_MET_PER_KG_PER_MINUTE, or at least SCALING_FACTOR.

This is not used anywhere other than main therefore should be a local variable there:

private static double totalCaloriesBurned = 0;


Then you do not need to initialize it to an unused value.

In main unnamed constant 150 is used repeatedly. You should name it weight or even better weightInPounds.

In:

public static double caloriesPerMinute(int met, double weight, double time)


caloriesPerMinute name is wrong, as it does not compute a per minute value. It could be renamed calories or caloriesBurned.

double weight, double time can be named weightInPounds and timeInMinutes to remind the user to do necessary conversion beforehand.

After renamings I suggested above the formula: value * met * poundToKilogram(weight) * time reads:

CALORIES_PER_MET_PER_KG_PER_MINUTE * met * poundToKilogram(weightInPounds) * timeInMinutes


So that it is easier to verify you did not mess up the units.