E-commerce sales in the fourth quarter increased 18.2%, and comScore reports sales on mobile devices accounted for nearly 21% of online sales in that period.

Online shoppers in the United States spent significantly more on their mobile devices during the 2016 holiday season and during the fourth quarter of 2016 as a whole, according to a just-released report from web measurement firm comScore Inc.

Shoppers spent $22.7 billion via their mobile devices (smartphones and tablets) during the fourth quarter, up 45.5% from $15.6 billion in Q4 2015. That growth helped push total online sales (desktop and mobile) during the fourth quarter to $109.3 billion, up 18.2% from $92.5 billion during Q4 2015.

Here’s how mobile and desktop spending looked during the fourth quarter:

The U.S. Commerce Department will report fourth quarter and full-year 2016 U.S. e-commerce sales on Friday.


Meanwhile, in a separate blog post, comScore reports shoppers spent $17.1 billion on mobile devices during the 2016 holiday shopping season, which it defines as November and December, up 44.9% from $11.8 billion in mobile sales during holiday 2015. Adding mobile sales to comScore’s previously reported $63.1 billion in desktop spending means shoppers spent a total of $80.2 billion online during the holiday shopping season, up 17.4% from $68.3 billion for desktop and mobile spending in the year-ago period.

While mobile sales growth is dramatically outpacing desktop in terms of growth, desktop still dominates overall online sales. Mobile accounted for 20.8% of overall web sales during the fourth quarter and 21.3% of overall web sales during the holiday shopping season. Last year, mobile accounted for 16.9% and 17.4% of overall sales during the respective time frames.