The Wall Street Journal has done two clever things. First, it has created an online calculator that tells you what percentile your household income fits between 1% and 99%. Second, it has made that online calculator unembeddable, which means I have to link over to their site to let you use it. (Wasn't this whole movement supposed to be about shared goals and solidarity? Oh, well.)
As a general rule of thumb, if your household makes between $1,000 and $80,000, your household income is your percentile, give or take seven percent. For example: $10,000 puts you in the 11th percentile; $40,000 puts you in the 47th percentile; $60,000 puts you in the 61st percentile; and $75,000 puts you in the 70th percentile. Once you get to six figures, the rule breaks down.