The math the standard reviews miss
Most "best grocery card" lists are written against an implicit single-person or DINK household — $300–$500/month at the supermarket. At family-of-four volume (USDA's moderate-cost plan puts it around $1,300–$1,800/month), the same cards rank completely differently. Almost every grocery bonus category has a cap, and the cap is where the leaderboard reshuffles.
The pattern that wins at family volume is almost always a pair, not a single card:
- A high-multiplier grocery card up to its cap (Blue Cash Preferred at 6% to $6K/yr, Amex Gold at 4× MR with no cap).
- A fallback for the overage — usually a flat 2% card or a Costco-runs-only Visa.
Three traps to watch for
- Walmart and Target aren't groceries. They code as discount stores on most networks. Your "5× at supermarkets" card earns 1× there.
- Costco doesn't take Amex. Half the family-grocery-card recommendations on the internet assume Amex acceptance — they're wrong for any household that buys diapers and chicken breasts in bulk.
- The $6K BCP cap maps to $500/mo. If your real grocery spend is $1,300/mo, you're earning 6% on the first $500 and 1% on the next $800. The math still wins, but barely — the Gold's uncapped 4× MR pulls ahead above $700/mo if you'll redeem MR for travel.