Meguro Language Centre, source of some excellent JLPT resources, has a nifty kanji quiz on its website. The quiz is honour based - just tick the box next to the kanji or kanji compound if you think you can read it. There are 200 kanji/compounds and if you get them all right you are assessed in the 1900-2000 kanji range. Not having to write the readings and the tendency for people to tell themselves "but I knew that!" mean that this quiz is not super reliable but it provides a ballpark figure. How will you fare?