Internet spending has leapt by more than a quarter in the last two years, figures show.
Card spending online reached £154 billion in the UK last year, averaging £422 million a day, the UK Cards Association said.
The figure is an increase of 28% since 2014, when online spending amounted to £120 billion.
The UK spends more online per household than any other country, at 5,900 US dollars in 2015 – higher than Norway (5,400 US dollars), the US (4,500 US dollars) and Australia (4,000 US dollars), the study found.
Spending on entertainment accounted for one in four online card purchases.
A quarter of all card spending (26%) was online last year, up from 22% in 2014, with 1.8 billion purchases made online at an average of 150 million a month – an increase of 38% from 2014.
Nearly four in every 10 pounds spent on travel is paid for online, with 54% of spending on flights made through the internet.
Consumers now go online for a quarter (23%) of all clothing spending, while 67% of concert ticket spending and 61% of cinema, theatre and dance spending is done on the internet.
Richard Koch, head of policy at the UK Cards Association, said: “Since the early days of internet shopping there has been a host of innovations, from digital wallets to one-click purchases, which bring enhanced security, choice and convenience for customers and which will lead to continued growth in the sector.
“The additional protection provided when using a card also gives consumers extra peace of mind when they are shopping online.”