Abstract: A rebar chair having rebar seats in the top, bottom, left side, right side, first end, and second end. The rebar chair has a first distance between the sides, a second distance between the top and bottom, and a third distance between the ends. The rebar seat in the top has a first height, the rebar seat in the left side has a second height, and the rebar seat in the first end has a third height so that the rebar chair can provide at least three different support heights depending on the orientation. The bottom rebar seat may have the first height, the right side rebar seat may have the second height, and the second end rebar seat may have the third height. Each side includes at least one an engagement feature that enables the rebar chair to be stacked with and/or connected to an adjacent rebar chair.