We know that we add an Australia every month to our population.
We know that each state of India is big enough to be a separate country by itself. Like each vertical in an Infosys or TCS could be a respectable-sized company itself.
But The Economist has done a great job bringing such comparisons alive. We know now that Maharashtra's GDP is as much as Singapore; its per capita GDP compares well with Sr Lanka's and its population with Mexico. Karnataka's GDP is as big as Coratia's; per capita GDP as much as the Phillipines and population as much as Italy's.
Enjoy this interactive map and gain insight into relative size of India's states and other countries.