I have a handy dandy spreadsheet that calculates it for me. Basically, it takes the savings from sales and coupons divided by the shelf price. So for example, I buy $10 pre-sale worth of stuff. It was on sale for $8, so $2 savings, plus I used a $2 coupon for a total of $4 savings. $4 savings divided by $10 shelf price gives you 40% savings. I do not include sales tax because food is not taxed in my state, and there is no sales tax in my neighboring state.


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Disney January 2013 Savings: 37.65% of goal
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