More than three quarters of people in the UK now do at least some online grocery shopping, according to supermarket chain Waitrose.
Separate research suggests almost half of consumers feel their shopping habits will change permanently due to the crisis.
Retail Economics said many retailers were “scrambling” to adapt.
Waitrose polled 2,000 people across the UK and found that 77% now do at least some of their grocery shopping online, compared with 61% the year before.
However, there was also a big rise among 35 to 44 year olds, with 32% now doing at least one online shop each week.
The supermarket chain, which sells online via Ocado, said it expected the shift to become permanent.
“Because online shopping quickly becomes habitual – these changes are irreversible,” said Waitrose & Partners executive director James Bailey.
“Consumer behaviour is evolving at a frightening pace and the single largest challenge for retailers is to meet, if not exceed, customers’ expectations,” said Retail Economics boss Richard Lim.
It said the sudden acceleration of online shopping “will continue to be the biggest threat to retailers”, as those who do not keep up could be left behind.