Grocery Rebate & Cashback Optimizer
Loyalty cards, cashback apps, and rewards credit cards can all apply to the same grocery purchase. This calculator layers each discount correctly (not just adding percentages) to show your real annual savings and effective discount rate.
About this calculator
Estimate your effective savings rate from stacking store loyalty discounts, cashback apps, and credit card rewards on grocery spending over a year.
Frequently Asked Questions
Why aren't the percentages just added together?
Each discount typically applies to the remaining price after the previous discount, so stacking them multiplicatively gives a more realistic estimate than simple addition.
What is redemption efficiency?
Many rewards programs have redemption friction — points that expire, minimum thresholds, or below-face-value redemptions. This factor discounts the theoretical rewards to a realistic collected amount.
Can I use this for non-grocery spending?
Yes, the same layered-discount logic works for any recurring spending category like gas or dining.