In 2012, it was USD 9.5 billion (Rs 47,349 crore).
The industry body said in a release that it expects online retail to grow further as policy and FDI issues are addressed and delivery logistics improve.
Apparel and jewellery brands which are marketing and selling their products increasingly through the online channel, were the key drivers of the trade.
IAMAI estimates the number of online retailers to be over one million, representing a very wide range of categories -- electronics, books, apparel, accessories, footwear, jewellery and so on.
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Apparel and fashion accessories make the majority of sales in the east and south, while jewellery, leather and consumer item sales are prominent in the north and western sectors, IAMAI said.
Citing experts, it said growth in India's online retail space is following global trajectory and proving to be a sustainable and profitable marketing and distribution model.
IAMAI said that while technology platforms tend to be run from city centres, the bulk of logistical management such as storage, godowns and deliveries are being handled from Tier 2 and Tier 3 cities.