how do you calculate winning percentage preflop

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I'm talking about the percentages that televised poker shows display preflop. I always thought it was by calculating outs and I am still sure that it has alot to do with it. But everytime I try to get the same percentage as the numbers shown on television, I dont get the same numbers.

How do you calculate winning percentages against however many people before seeing the flop? Kind of like the percentages that Phil Laak is famously known to shout out whenever he's all in preflop.

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If you want to do it just based on your outs, there are a lot of charts you can find in books or online that show some combination of odds (ratio)/outs/percentage to win.

Here is one with outs, odds and percentages: pokersyte.com chart

Here is one without the odds, just outs and percentages:
thepokerbank.com chart