Most people want paint to cover in one coat. Very few paints will cover in one coat over any color. Some will cover over a lighter color.
If the can says one coat coverage it may just do it for a pro but maybe not a do it for a non pro. Even I have a hard time getting some paint to cover in one coat.
One paint we are using now is doing a very good job of covering in one coat. Sherwin Williams Super Paint.
We have had some luck with Valspar getting it to cover in one coat.
A lot depends on what you are painting over.
A better paint equals better coverage.
As a rule of thumb most paint covers around 350 square feet. I figure 325 and put it on heaver so hopefully it will cover in one coat.
In : Painting Tips