Definition
Coin In is a metric that represents the total cumulative amount of money wagered on a slot machine or electronic gaming device. It includes the initial money a player inserts, plus all subsequent bets made using “recycled” winnings from that session.
In context
A player inserts $100 into a slot machine and plays for an hour at $1.00 per spin. Although they only put $100 into the machine, they may have hit several small wins, allowing them to spin 800 times. Their “Coin In” for that session is $800, which is the total amount the house edge was applied to.
Why it matters
Coin In is the most important metric for determining a player’s value to a casino. It is used to calculate “Theoretical Win” and to award loyalty points (comps). For the casino, Coin In is the “volume” of business; the higher the Coin In, the more times the house edge has been applied to the player’s money, regardless of whether the player walked away up or down.
Related terms
In detail
In the world of casino operations, “Coin In” is the king of data. If you walk into a casino and put a $100 bill into a machine, the casino doesn’t really care about that $100. What they care about is how much “action” you give them. That action is measured by Coin In.
The Misunderstanding: Buy-in vs. Coin In
Most casual players confuse “Buy-in” with “Coin In.”
- Buy-in (or Drop): This is the physical cash you put into the machine. If you put in $500, the “drop” is $500.
- Coin In: This is every single bet you make. If you are playing a $5-per-spin slot machine, every time you hit the “Spin” button, the Coin In meter increases by $5.00.
Because slot machines are designed to pay back a percentage of bets (usually 85% to 98%), you will often win small amounts. If you win $20 on a spin, you will likely bet that $20 again. When you do, that is “recycled” money. It adds to the Coin In, but it didn’t cost you any more “new” money from your wallet.
Why Casinos Love Coin In
The house edge on a slot machine is a mathematical certainty over time. Let’s say a machine has a 10% house edge.
- If your Buy-in is $100 and you lose it instantly, the casino made $100.
- If your Buy-in is $100, but you win/lose/win/lose and generate $2,000 in Coin In before finally going broke, the casino’s “theoretical win” on that session was $200 (10% of $2,000).
Wait—how can they win $200 if you only gave them $100? They can’t “actually” win more than you lost, but the volume of play allowed them to apply their 10% edge 20 times over. This is why casinos want you to play longer. The more Coin In you generate, the closer the machine’s “actual” hold will get to its “theoretical” hold.
The Math for the Player: Comps
If you have a casino loyalty card, your “points” are almost always based on Coin In. This is a common point of frustration for players. A player might say, “I lost $1,000 today, why didn’t I get any points?” The answer is usually that they lost that $1,000 very quickly on high-denomination machines, generating very little Coin In.
Another player might have only “lost” $100, but they played for 6 hours on a penny machine, hitting enough small bonuses to keep spinning. That player generated $5,000 in Coin In. Even though they lost less money, the casino views them as a “better” customer because they provided more “volume” for the math to work. They will receive more comps, free rooms, and food vouchers because their Coin In tells the casino they provide more opportunities for profit in the long run.
Operational Tracking
Inside every slot machine is a computer board called the “SMIB” (Slot Machine Interface Board). It tracks the “meters.” One of these meters is the Total Coin In Meter. This meter is permanent and cumulative. As a shift manager, we use this to audit the machines. If the “Coin In” meter says $1,000,000 and the “Coin Out” (winnings) says $900,000, we know the machine is perfectly holding 10%. If those numbers are wildly off, it tells us there might be a mechanical error or a software glitch.
Coin In vs. Handle
In the table games department (Blackjack, Craps), we use the term Handle. It is essentially the same thing as Coin In. It’s the total amount of bets placed. However, because it’s hard to track every single $5 bet on a busy craps table, table game “handle” is often an estimate made by the pit boss. In slots, “Coin In” is precise to the penny.
Summary for the Smart Gambler
The next time you play, don’t just look at your wallet. Look at your “points” or your total spins. If you want more comps, focus on generating Coin In. This means choosing machines with lower volatility (more frequent small wins) which allows you to “recycle” your money more times. You might still lose in the long run, but you’ll get more “free” stuff from the casino because your Coin In numbers look impressive on their computer screens.