Kochas is a town and corresponding community development block in Rohtas district of Bihar state, India.

As of 2011, the population of Kochas was 21,597, in 3,287 households, making it the largest village in Rohtas district.

The nearest major city is Sasaram, the Rohtas district headquarters.

[1] Kochas is an entirely rural block, with no major urban centres.

The sex ratio of Kochas block in 2011 was 916, slightly below the overall Rohtas district average of 918 (921 for rural areas).

The sex ratio was slightly higher in the 0-6 age group at the time, with 922 females for every 1000 males.

After the economic reforms of 1991 Kochas gradually become a small business hub having shops of agricultural equipment/Tools.This small town fulfill the day to day requirements of the people living in villages in surrounding area.

A majority of the Kochas block workforce was engaged in agriculture in 2011, with 36.84% of all block workers being cultivators who owned their own land and a further 44.41% being agricultural labourers who worked someone else's land for wages.

2.48% of the workforce was engaged in household industry (the lowest proportion of any block in Rohtas), and the remaining 16.28% was classified as other workers.

KPL Season 1 was started with Cricket in March 2021 and now the KPL organizers are committed to organize many sports tournament like Cricket, Football, Volleyball, Tug Of War, Kabaddi and many more..

In other settlements, drinking water was provided mostly by well and hand pump.

Kochas itself had both electricity and telephone services, along with a public library, a recreation centre with sports fields, and a post office.

Most households reported using cowdung cake as the main fuel for cooking, while 6.37% used firewood and 5.06% used crop residue.