Google Adsense Size

Leaderboard (728 x 90) - Google Adsense
Text - Displays up to 4 ads on a page

Banner (468 x 60) - Google Adsense
Text - Displays up to 2 ads on a page

Button (125x125) -
Displays 1 ad on a page

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Half Banner (234x60) - Displays 1 ad on a page

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Example- Google Adsense Code

<script type="text/javascript"><!--
google_ad_client = "pub-9422398696972170";
google_ad_width = 336;
google_ad_height = 280;
google_ad_format = "336x280_as";
google_ad_channel ="4630917651";
google_color_border = "CCCCCC";
google_color_bg = "FFFFFF";
google_color_link = "000000";
google_color_url = "666666";
google_color_text = "333333";
//--></script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

More Ad Sense Sizes