Maximum characters in Meta tags

Wanted to know what are the Maximum characters in Meta tags allowed. Is there any limit in Title, keywords, and Description?

Meta description is the number of characters - In Google, the search results list will only display up to 80 characters. Therefore, the number of characters in the description, it is recommended from 40 characters to 80 characters. Although it does not matter wrote more than 80 characters, meaning you will not write a sentence much longer considering the effect.

An ideal title tag has maximum. 65 characters for "special" long-tail queries are also possible signs 100-120. More are certainly not make sense (from an SEO perspective). For the meta-Description is similar: maximum 160 characters. The remaining meta-tags are irrelevant.

Meta TITLE - The title of our website. The Meta Title is one of the most important goals, and has the widest possible consistency with the content of the web. It is recommended that a short and specific.

Meta DESCRIPTION - This facilitates the description Meta tag content of our website. We recommend a sentence of greater size than the Meta Title, or a short paragraph of no more than 120 and 140 characters. And always in relation to the content and other goals as the Meta Title and Meta Keywords.

META KEYWORDS - This Meta tag tells search engines the words you want to appear in their searches. Words can be separated by spaces, commas, or both at once. It is recommended to repeat words, only the most important words and using capital letters only when necessary. The number of words for Meta Keywords, usually 10 to 20.

Number of characters for title tag, Meta Description Size, Length of URL

Google
Title tag 66-69
META description 156-158
URL 75-92

BING
Title tag 67-72
META description 176-184
URL 91-94

Yahoo!
Title tag 64-65
META description 164-190
URL 65-80

SEOmoz
Title tag <65
META description <156
URL <65

I think 60 to 70 maximum characters in Meta tags are there.

I think the same vary as per search engine. There might be minor difference only. Here in Google you have around 69 Characters for a Page Title and 156 for Meta Description. This are counted with spaces. On the other hand for Yahoo the Page Title characters increase to 72 and 161 for Meta description. The example you can see in the search result itself. Some search engine like Ask.com allows you to have a much bigger meta description. I do not think it is possible to optimize the same in respect to every search engine.