The research also revealed that convenience store shoppers on average used them three times a week, while 59% made two visits a week.
The ‘Small store shopper’ report also found that 35-54-year-olds and those from AB socio-economic groups are more likely to use convenience stores to buy something for their evening meal and to buy alcohol.
Those aged 15-24 and in CDE socio-economic groups are more likely to use convenience stores to buy cigarettes and other tobacco products - as well as to buy lunch and snacks.
Joanne Denney-Finch, chief executive of IGD, said: “Convenience stores are clearly popular and this trend is set to continue. We predict the market will be worth £42.6bn by 2015, up a third from its current value.
“The main consumer trends that will contribute to this growth include a growing population, less meal planning, more people missing meals at home and a desire to shop locally.
“As more and more people live in urban areas nearer convenience stores, retailers and suppliers need to ensure they are aware of the changing profile of their catchment area. And they will have to adapt their product range and merchandising accordingly.”