Does RDA include absorption?

[blackshugar97]

I just wanted to know if the RDA includes absorption rates for all the nutrients in its recommendations. For example, it recommends 1000 mg of calcium per day, so does that include the fact that we absorb on average only a third of it from our diet and hence we need only 300 - 400 mg of it considering the bioavailability? Or does it require us to absorb a total of 1000 mg? Any help is appreciated.