The figure that the estimated savings of packing your lunch is $3380 per year is an exaggeration.  It is based on a series of faulty assumptions: 1) That you spend the maximum of the range they found typical per meal, not the average.  The average was less than $10 per meal.  2) That your packed lunches are free, which clearly they are not.  3) That you work 5 days a week, 52 weeks per year.  A more reasonable calculation would be that you save $7 per day ($10 spent out minus $3 cost of making your own meal), that you work 45 full 5-day weeks per year (allowing 4 weeks of vacation, two weeks worth of stat holidays, and one week of sick leave).  This comes to a savings of $1575 per year.