How credit card rewards actually work
Every rewards card pays you back a slice of what you spend. The trick is that the slice is measured two different ways — a rate and a value — and only multiplying them together tells you what a card is really worth.
Plain-English explainer · updated 2026-09-16
The two numbers that matter
A card advertises an earn rate: 3x, 5%, 2 miles per dollar. That's how many points, miles or cents you get per dollar spent. But points and miles aren't dollars — each one has a value when you redeem it. A cash-back "point" is worth exactly 1 cent. An airline mile might be worth more, or a lot less. The real return on a dollar of spending is rate × value, and that's the only number worth comparing across cards.
Why a 5x card can lose to a 2% card
Suppose one card earns 5x in a hotel program whose points are worth half a cent each. Five points at 0.5¢ is 2.5 cents back per dollar. A flat 2% cash-back card pays 2 cents — close, and with none of the strings. Now suppose the hotel points are only worth what the chain feels like giving you that week. The 5x "deal" can quietly fall behind a boring cash card. This is the single most common way people overvalue a card: they compare the multipliers and ignore the currency. We rank every card on our best-card guides by rate × a conservative value, never by the raw multiplier.
Cash back, points, and miles
Cash back is the simplest — a point worth a penny, redeemed as a statement credit. Bank points like Chase Ultimate Rewards or Amex Membership Rewards are flexible: you can cash them out or move them to airline and hotel partners. Airline miles and hotel points live in one program and are worth whatever that program charges for an award. We publish our honest, conservative value for each currency on the point-values pages.
What this means for you
The best card isn't the one with the biggest number on the ad — it's the one whose real return, across the categories where you actually spend, beats the others in your wallet. That depends on your spending, not the card. That's the whole reason the Credit Upside optimizer exists: it re-scores a year of your real charges against every card, using the same values you'll find on this site.
Put it to work
Which card should this spending actually be on? The demo re-scores a year of realistic spending against every card in a wallet — free, no signup. See it on sample data →
More basics:
Points vs cash back · Transferable points · How churning works · What is 5/24? · Are annual fees worth it? · Authorized users · Welcome offers · Glossary · all guides →