Restaurant chain Chipotle Mexican Grill has reported an increase in sales in the second quarter, with 47 new restaurants opened in 40 locations.

For the three months to June 30, revenue increased 13.6 per cent to $2.5 billion, driven by comparable restaurant sales – up 7.4 per cent – and new store openings.

Food, beverage and packaging costs were 29.4 per cent of total revenue, while in-store sales grew 15.8 per cent and digital sales – via the Chipotle website, app or third-party aggregators – added 38 per cent to food and beverage revenue.

Brian Niccol, chairman and CEO of Chipotle, said the results demonstrate the brand’s ability to “drive strong performance” by focusing on “exceptional food and exceptional people”.

“Additionally, our investment in our employees, technology, and innovation in our restaurants along with expanding access and convenience in North America and laying the groundwork for international growth, set us up for long-term success.”

The company expects full-year comparable restaurant sales growth to be in the mid to high single-digit range.