The film has grossed over Rs 100 crore in India, meaning Khan joins an elite already consisting of Aamir Khan, Salman Khan and Ajay Devgn.
Trade analyst Taran Adarsh told The Times of India: "Ra.One has grossed almost Rs 112 crore (£12,438, 971) in its Hindi version in the first two weeks. Today, he too is part of the billion club; that has now become the parameter with which a film's box office business is judged."
Expert Komal Nahta said that he never doubted that the film would make 100 crore: "I was very confident it would cross that mark. In fact, I was expecting it to happen in the first week itself considering the number of shows and screens, but it happened the week after.
"The film makes you realise the kind of business big budget films can do if you have a five-day weekend."
Nahta continued: "It's a recent phenomenon in the last three years that big films like 3 Idiots, Dabangg, Ghajini and Singham have done such huge business. Though My Name Is Khan was a huge hit and the highest grosser abroad, it did not enter the billion rupees club in India.
"There was no doubt that SRK would enter this club with his next film. By all accounts, Ra.One is expected to do business of approximately Rs 125 crore in net collections in its Hindi version alone."
Nahta concluded that Khan will make a strong profit from the film. "It's a win-win situation for SRK and all involved in the film," he said.