Maximum amount for CPC in Google Adwords

As far as know there is no upper limit as such.

But I'm sure there must be more to your question than that.
What exactly ado you want to do?

Rather than seeking what's your maximum amount for CPC, how about taking time to read this article to know what's the average CPC across different industry: http://www.wordstream.com/blog/ws/20...try-benchmarks

At least to put your PPC mindset right on track.

There is no such max limit. Choose as per your choice.

I was never aware of any maximum bid you could place. If you want to bid $100, you can.

However, I believe that there's an effective, behind-the-scenes limit. Say you want to be in first position in a category where a $1 bid is average. Since ads are ranked by QS times bid, you may think all you have to do is bid well above that, say $10. You may think that even if your QS was 5, bidding $10 gives you an ad rank value of 5000 while a competitor bidding $1, even with QS of 10, has a value of 1000. Technically, you should outrank that competitor. But that's not the case. There are other factors in play and one way is to place an upper limit on the bids. In this category it might be $2 so bidding $10 would be the same as bidding $2 or in my example of a 5 QS, give you an ad rank of 1000 so you are on a more even footing with competitors.

I also want to comment on the link provided by Nik. This sort of information is very deceiving. The average CTR by industry is deceiving because CTR is affected by position. It is also affected by the ads themselves. This data is from Wordstream so presumably they have good managers but I've found that is not always the case. I've seen many poor ads by people in the PPC industry. There is also the fact that, for instance in the ecommerce industry, this can represent many different products, again with ads of different quality, different bids thus in many different positions. The danger is that someone seeing that 1.66% CTR in search and they get 3% thinking they have it made may be deluding themselves. Their campaign may actually not be that good. They may not continue trying to improve and that will hurt them in the long run. One must look deeper, past the raw numbers and one number such as some average number someone comes up with. I have the same comments for all the other charts shown. I strongly advise against using them as part of your strategy.

No such thing. only minimum limit.

i only know of minimum limit, i don't think maximum amount limit does exist