During the colonial period, notable Indian economists and scholars like Dadabhai Naoroji, William Digby, Findlay Shirras, V.K.R.V. Rao, and R.C. Desai estimated various economic indicators related to India's economic condition. The estimations made by these individuals included:

(1) India's National and Per Capita Income: Estimating India's overall national income and per capita income was a significant focus of economic analysis during the colonial period. Dadabhai Naoroji, in particular, is known for his work on estimating India's per capita income, which he used to highlight the economic exploitation of India by British colonial rule.

(2) India's Tax Wealth: Estimating India's tax revenue and the wealth extracted through taxation was another important aspect of economic analysis during the colonial period. These estimates were often used to underscore the economic impact of British taxation on India.

(3) England's Per Capita Income: Estimating per capita income in England was also part of the economic analysis, and it was sometimes compared to India's per capita income to illustrate the disparities between the colonizer and the colonized.

(4) Total wealth taken by Britishers: This estimation involved the calculation of the wealth and resources extracted by the British colonial rulers from India during their rule. The assessment of how much wealth was transferred out of India was a significant topic of discussion during that time.

These estimations played a crucial role in raising awareness about the economic conditions in colonial India and the impact of British rule on India's economy. They were often used to advocate for economic and political reforms.