Question on calculating holdem odds using 4/2 method

[Louie Landale]

You don't.

The 4% (with 2 cards to go) and 2% (with one card to go) times your # outs to estimate your chances is fair when you have few outs, such as 3, but falls apart in accuracy when you've got lots of outs. With 15 outs you are actually about even money but the 4% method shows you as a 60%:40% favorite. Anyway, this method doesn't address back-door draws.

Back-door draws are "worth" about 1.5 outs. More accuracy is worth only pennies.

- Louie