• CPM (impressions). The more people who see an ad on your site, the more you get paid. The payment is usually per thousand viewers (M is the Roman numeral for 1000, so CPM means "cost per thousand"). Typical rates are $20-$35 per thousand, but most advertisers want sites that generate over 10,000 visitors/month.
• Click throughs. You can earn money every time someone clicks through from an ad on your site to another site. Typical payments are 5 to 15 cents per click.
• Commission sales. Can you say "Amazon?" When someone clicks from your site to another site and buys something, you could earn a commission of 5 percent (or more) of the sales price.

It is inefficient for advertisers to send out small checks. Most Internet advertising plans wait until your site generates a specified total--say $50--before they send you a check.

You need to check the advertiser's web site or other sites to find out their click through payments and/or commission rates, and their minimum payment. After doing your research, click the hotlink on the left for the type of calculation you want to do.