What is the methodology of calculating poverty line?

(i) On the basis of calorie intake for the year 2000, the poverty line for a person was fixed at ₹328 per month for the rural areas and ₹454 per month for the urban areas.
(ii) Despite less calorie requirement, the higher amount for urban areas has been fixed because of high prices of many essential products in urban centres.
(iii) In this way in the year 2000, a family of five members living in rural areas and earning less than about ₹1,640 per month was below the poverty line.
(iv) A similar family in the urban areas needed a minimum of ₹2,270 per month to meet their basic requirements.
(v) The poverty line is estimated periodically by conducting sample surveys. Many international organisations like the World Bank use a uniform standard for the poverty line.