How do I know my SEO ranking?

How to Determine Your True Organic Google Ranking

1. Log into your webmaster tools account. ...
2. You will then see a list of your top keywords.
3. Click on a particular keyword you want to view the ranking data for. ...
4. You can modify the results by changing the date range and country to your desired choices.

Click on a particular keyword you want to view the ranking data for. In the screen shot below, you will see that this site ranked for "example" in several positions. They had 9,900 impressions for position 1, 6,600 for 2, 3,600 for 3 and so on. By using this data, that translates into this.  29% of the time this site ranked for the #1 spot, 19% at #2 and 9% at #3. Overall, this site was ranked in the top 3 for almost 60% of the time.