Casino Comps, Explained: How Free Rooms Are Really Priced
Last reviewed: July 2026
The honest framing: a comp is not generosity, and it is not a reward for being lucky or charming. It is a priced rebate on your expected losses, calculated from the same house-edge math that runs every game on this site. Casinos comp you because the math says you’ll lose more than the comp costs them — every time, on purpose.
Understanding that pricing doesn’t make comps bad. It makes them legible: once you know what your play is worth, you know what it’s reasonable to ask for, which offers are genuinely good, and when a “free” room is quietly the most expensive night of your trip.
The number everything runs on: theoretical loss
Every player’s club, every pit rating, every host decision keys off one quantity — your theoretical loss, universally called theo:
Theo = average bet × decisions per hour × hours played × house edge
A $25 blackjack player at 70 hands an hour for four hours, against a ~0.5% basic-strategy edge, generates $25 × 70 × 4 × 0.005 = $35 of theo. That’s what the casino expects to win from that session — not what you actually lost. You might have won $500 or lost $500; your theo is $35 either way, and it’s theo the comp system pays on. (Some systems blend in actual loss for table players, but theo is the backbone.)
The casino then “reinvests” a fraction of your theo back to you — commonly cited planning numbers are 20–40%, depending on the property and how badly they want your business. That reinvestment is your comp: the buffet, the free play, the room offer in your inbox.
How the earning actually works, by play type
Slots and video poker earn on coin-in. Machines report every wager, so points accrue on total dollars cycled through — win or lose. A typical base rate is a point per $5–$10 of coin-in with points worth about a cent, i.e. roughly 0.1–0.25% of coin-in back in value. Video poker almost always earns at a reduced rate, because its house edge is a fraction of a slot’s.
Table games earn on a rating. No machine watches your bets, so the pit does: a floor supervisor logs your buy-in, average bet, and time played, and the system computes your theo from the game’s assumed edge and pace. Comps come back as a share of that theo, at the property’s discretion. Two consequences: unrated play earns nothing at exactly the same expected cost, and your average bet and time matter more than your results.
Everything else — tiers, mailers, hosts — is a multiplier on the same base. Status tiers raise earn rates and unlock perks; mailed offers are priced off your tracked average daily theo; a host is a human with a budget that is, once again, a percentage of your theo.
What this means in practice
- Get rated, always. Card in at machines, ask for a rating at tables. It’s the difference between a rebate and nothing.
- Comps compare on one axis: effective rebate — comp value ÷ theo. A fat points balance from high-edge slot play is often a worse exchange than modest pit comps on a low-edge table game.
- The casino’s math already includes your comp. Nothing about earning points changes the house edge underneath.
Want your own numbers? Our comp calculator computes theo from the exact edges of the games we cover and prices the major programs’ base earn rates against it — see the Comps hub for program-by-program guides.