The DJ became internationally famous when he teamed up with Rihanna for her single 'We Found Love' in 2011 and he says he will always be grateful to her because it opened so many doors for him.
He said: ''It changed absolutely everything. Career-wise it was the best thing that could ever have happened.
''For example, in America my tune 'Feel So Close' came out about three months before.
''But when 'We Found Love' came out, the radio started playing 'Feel So Close' like it was the single after.
''Then that did really well, it charted well and sold a lot of copies.
''Then radio stations wanted to play me like I was the new act. That changed a lot of things as they wouldn't play me before.''
While he is enjoying huge success at the moment, Calvin says he has no desire to play big stadium gigs and would rather do more intimate performances.
He told The Sun newspaper: ''I don't feel like I want to do the arenas and all that. I don't want to be like the Swedish House Mafia. I don't want to be playing these big shows and putting myself up there.
''I like playing in clubs. If I play again in the UK, it'll be Warehouse Project in Manchester or The Arches in Glasgow - but I don't want to try and go for f***ing stadiums.''
Calvin's new album '18 Months' is released on Monday (29.10.12) and can currently be streamed in full at http://www.calvinharris.co.uk/18months.