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According to the Office for National Statistics, the wedding of Harry's elder brother William to wife Kate in April 2011 led to an increase of 350,000 visitors to the UK compared to the same month the year before and business valuation consultancy Brand Finance predicted a similar surge in May.
In total, it estimates the nuptials will generate some 500 million pounds ($680 million).
About 150 million pounds would be spent on people having parties and celebrating with 50 million coming from people buying T-shirts, hats and other commemorative items, he said.
Businesses in Windsor are already gearing up to take advantage of the worldwide interest in the couple, with Harry, 33, one of the most popular members of the British royal family and Markle, 36, best known for her starring role in the TV legal drama "Suits", providing some Hollywood sparkle.
"It's going to be a massive boost for the economy, it's going to be great to see so many people here for the wedding and actually to host the wedding itself," said Andrew Lee, manager of the Harte and Garter hotel opposite Windsor Castle.
British tourism bosses are already predicting 2018 to be a bumper year for the industry, aided by a fall in the value of the pound since the 2016 vote to leave the European Union which has attracted visitors and deterred Britons from vacationing abroad.
VisitBritain, the national tourism agency, estimates that 41.7 million visits from overseas will be made to the United Kingdom in 2018, generating 26.9 billion pounds in the process.