Inside bets sit on the numbered grid. A chip in the middle of a box is a straight up bet at 35 to 1. On the line between two boxes it is a split at 17 to 1. On the outer edge of a row it covers a street of three numbers at 11 to 1, and on the corner where four boxes meet it pays 8 to 1. A chip on the edge between two rows covers six numbers at 5 to 1.
Outside bets sit around the grid. Red, black, odd, even, 1 to 18 and 19 to 36 pay 1 to 1 and cover 18 numbers each. Dozens and columns pay 2 to 1 and cover 12 numbers each. Zero and double zero belong to none of them, which is why an even money bet wins slightly less than half the time.
The five number bet — zero, double zero, 1, 2 and 3 — is the one exception on an American table. It pays 6 to 1 and carries a 7.89% edge, the worst on the felt.
Placing a chip is easier than reading about it: hover a boundary on the table and the highlighted numbers show exactly what the bet covers before you commit.