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Note that such a calculator is only calculating the carbon footprint of the existing equipment in a data center. It could be expanded eventually to cover the full Greenhouse Gas Protocol for data center, so that it could be used to certify a "carbon neutral" data center. That would require accounting for all the Scope 3 emissions, including the carbon footprint of new capital assets (servers), employee commuting and business travel, and other purchased supplies and equipment.
We will could implement this MVP application using the True TCO Calculator for Data Centers, as described in this Uptime Institute white paper.
References
Building Data Center of the Future
Data centers are more energy efficient than ever