Restaurant Brands International has today beaten quarterly revenue estimates, as a reopening US economy and government stimulus cheques boosted spending at the company's Burger King chain.

After a year of ordering in, more Americans have started to go back to restaurants as a $1,400 stimulus payment from the government in March boosted spending.

The rollout of Covid-19 vaccines have also lifted consumer confidence.

The company said its total revenue rose to $1.26 billion in the first quarter ended March 31, from $1.23 billion a year earlier, and was above analysts' average estimate of $1.25 billion, according to IBES data from Refinitiv.

However, same-store sales at the company's Popeyes restaurant chain rose just 1.5% in the quarter, missing expectations of 1.7% growth.

The Cajun-inspired fast-food chicken chain struggled to repeat last year's explosive growth when its social-media favourite chicken sandwich was still fresh in the minds of Americans.