If you prefer doing the ratio method, don't include your call into the pot. So, call $50 to win $150 is 3:1 odds.

If you prefer doing the percentage method, you do include your call. So, call $50 to win $200 = 25%.

I actually do a mix of both. I use the ratio for pot odds. I use the percentage method for card odds using the rule of 2/4 + 1, and then i convert that to the ratio method, which is fairly easy. Just calculate how much your outs percentage goes into 100, and then minus 1.

For example, let's say you have 9 outs on the flop. 9 * 2 = 18 + 1 = 19% to hit on the turn. You know that 20% goes into 100 5x, so 19% is going to just be slightly more than that. I estimate ~5.2x.

5.2 - 1 = 4.2:1 hand odds.

Honestly, to keep things simple, I'll round up/down when converting percentage to ratio. So, in the example above, I'd calculate for 20%. If you keep the following ratio method rule in mind:

- Pot Odds > Hand Odds = +EV

you very rarely will have to be exact with your percentage-to-ratio conversions.

If you prefer the percentage method, the rule is:

- Hand Odds > Pot Odds = +EV