The report from Vector Research concluded the three-day event generated £32m for local economy – three times more than expected.
An estimated 800,000 people attended Sea Oddyssey, which saw , acting out a story inspired by the centenary of the Titanic’s sinking.
The average visitor spend was £40.74 per person, with those staying overnight spending an average of £34.55 each on accommodation.
Of the £32 million spent in the city, nearly £10.5m was on accommodation and £20m was on other expenditure such as in restaurants, shops and at other tourist attractions.
Out of hundreds interviewed at the event, 43 per cent of people were from Liverpool, around 50 per cent were from the rest of the UK and more than six per cent were from overseas.
Joe Anderson, mayor of Liverpool, said: "This was the biggest event in Liverpool’s history. Thanks to the creative brilliance of Royal de Luxe, the hard work of the city council’s culture team and the amazing support of members of the public we have put on a spectacular show which captured people’s hearts and imagination."
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