Where can you check how much contributor value a game gives?

Steam store USD price. Except games on the bundle list which give 15% of said USD store price.

EDIT: The value listed on your profile is the store price of all items given away and doesn't reflect the reduced CV for bundled titles.

On this list and giveaway created after the date next to the particular game on said list? https://www.steamgifts.com/bundle-games

1. Yes → CV is 15% of the current non-discounted USD price.
2. No → CV is 100% of the current non-discounted USD price.

Useful tool: http://www.sgtools.info/sent/AlwaysBorn/newestfirst

I don't have an answer but I know if its been bundled before that is account for so just looking at steam price isn't always right

If a game is in the bundle list then it only gives you 15% of it's price as CV. Otherwise you get 100% of it's US store price.
Note that sometimes, especially with newer bundles there's a delay in when they get added to the list, but when they do get added they are put there with the date the bundle was released so even if they gave 100% in the time between the date the bundle was released and the date they were added to the list that will change to 15%. For the most well known bundle sites it doesn't take more than a few hours/couple days at most times but for some obscure bundles it can even take months.
Price glitches/very high sales also go on the bundle list.

There's more info on the F.A.Q.

Try to create a giveaway for the game, then choose Gift option and Create Giveaway. On the final screen before you confirm the giveaway, you can see the value in points. This amounts to the raw CV value in dollars. If it's a bundle game, take 15% of that value, otherwise 100%.
Remember to cancel the giveaway before you confirm it by accident :P
Alternatively, you can search for a game in the SG Archive and open an old giveaway to see its latest point value. Remember to double check if it can actually still be given away, though.