Maximum number of characters in Meta tags

there are around 70 chracters in meta tags

 

Google shows 69 Characters (Including Spaces) for Page Title.
Google shows 156 Characters (Including Spaces) for Meta Description.
It should also be known that if you don’t include a Meta Description or if Google feels a better description for your page could be given by using a web snippet, then the description shown can be up to 320 characters. Of course, they won’t be the characters that you choose so they might not best represent what you wish your audience to see in the SERP’s.

Bing shows 65 Characters (Including Spaces) for a Page Title Tag.
Bing shows up to 150 Characters (Including Spaces) for Meta Description Tag.
However, as you can see in the example above, Bing will readily show 69 characters for the Title Tag and up to 185 for the description.

Yahoo shows up to 72 Characters (Including Spaces) for a Page Title. (PDF’s up to 75 characters)

 

title 66 character
description 150 character
10 keywords are allowed