Some 75 percent of the 80 million U.S. online households have made purchases online, according to a new report from Forrester Research.

More than two-thirds of U.S. online households have made an online purchase within the previous three months, writes Internet Retailer, citing a Forrester report. Some 19 percent of web shoppers spent $500 online in the previous three months, 16 percent spent $250-$499, 26 percent spent $100-$249, and 39 percent spent up to $99, according to Forrester.

Those who spent at least $500 in the previous three months comprise about 10 percent of the U.S. online population. Online commerce, excluding travel and auctions, is expected to exceed $270 billion by 2011, Forrester estimates.