Describe how the poverty line is estimated in India

Describe how the poverty line is estimated in India.
or
Explain some ways by which the poverty line is estimated in India.

A person is considered below the poverty line if his/her income or consumption level falls below a ‘minimum level’ necessary to fulfil basic needs. While determining the poverty line, a minimum level of food requirement, clothing, footwear, fuel, light, educational and medical requirements, etc are determined for subsistence.
Estimating the poverty line is also based on the desired calories requirement. It is 2400 calories per person per day in the rural areas and 2100 calories in the urban areas.