Buying groceries can be expensive, which means there's lots of room to earn some great rewards. If you're looking to earn the highest returns, your only solid option is going to be earning points or cash back with American Express as they currently have control of the 'grocery/supermarket credit card' market. You should have no problem with acceptance of AMEX in the US unless you're obtaining groceries from a Mom & Pop's shop.
Membership Rewards Credit Cards
If you're looking to earn Membership Rewards Points, which can be worth as much as 2 cents each, the American Express Gold Card and American Express Everyday Preferred are the best options. You'll be earning 4x to 4.5x with these cards which can give you a solid return if you have the spend to support them. If not, you can fall back to the no annual fee American Express Everyday Card.
Cash Back Credit Card Options
In terms of cash back, you'll have the American Express Blue Cash Preferred and the no-annual fee American Express Blue Cash Everyday. If you spend more than around $270 per month, the Preferred is the better choice otherwise you should choose the no-fee Everyday card.
If you don't want to mix and mingle with AMEX, you can grab up the Bank of America Cash Rewards Card to earn a minimum of a 2% return and as high as a 3.5% return if you have money to invest with them. You can also pick up a 2% cash back credit card like the Citi Double Cash or PayPal CashBack Mastercard.
Best Cards By Spend Calculator
The Best Credit Cards By Spend Calculator will find the best credit cards based on the spend and selected filter options. Results will be sorted by net return which is the average value of the total rewards earned, plus annual credits, and minus annual fees. For any of the results listed, you can click on 'Rewards Calculator' to calculate more accurate results. You'll be able to enter spend for as many categories as you want, toggle annual fees, add authorized users, specific elite status and memberships, incorporate sign up and welcome bonus, view rewards as if you transferred them to partners, and much more.