A long way from its days as just an online flea market, eBay Inc. is projecting to more than double its revenue by 2015 to $21.5 billion, up from $14.1 billion last year, as it drives global gross commerce sales of $300 billion within two years—up 74.1% from $175 billion last year—across its e-marketplace, online payments and e-commerce technology and services businesses.

“Led by mobile, a commerce revolution is under way,” eBay president and CEO John Donahoe said today at a meeting with financial companies. “Technology is creating a new web-enabled retail interface, a new seamless, multiscreen commerce experience that connects consumers anytime, anywhere. This will expand shopping beyond conventional store environments and e-commerce sites. How we shop is being transformed, and eBay Inc. intends to be a leader in this new commerce world.”

EBay’s projected $300 billion in global gross commerce sales includes what it expects to generate in gross merchandise volume through sellers on its e-marketplaces, the total net payment volume processed through its PayPal payments unit, and the total volume of online merchandise sales conducted through retailer clients of GSI Commerce, an eBay unit that provides e-commerce technology and services to hundreds of retailers.

EBay’s growth projections come a week after it announced an update of its e-marketplace, with new seller fees it contends make eBay a better deal for marketplace sellers than chief rival Amazon.com Inc., No. 1 in the Internet Retailer Top 500.

In the mobile commerce market alone, Donahoe says, eBay expects to generate $20 billion of mobile and payments volume in 2013.

EBay also projected:

Revenue from e-marketplaces, including eBay.com, will fall within a range of $10.5 billion to $11.5 billion by 2015;

Revenue at GSI Commerce will reach $1.5 billion to $1.7 billion in 2015.

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