Gaini is located at .
It has a good climate to produce sugar cane and in winter seasons here Cauliflower, Carrot, cabbage production in high rate.
It's area of River Ganga.
As of 2001[update] India census, Gaini had a population of 12,510. Males constitute 53% of the population and females 47%. Gaini has an average literacy rate of 52%, lower than the national average of 59.5%: male literacy is 56% and, female literacy is 44%. In Gaini, 23% of the population is under 5 years of age.