Homeschool curriculum grade levels, by program

Level-by-grade charts for 21 math, reading and language arts programs, each level marked with its evidence and sources.

In short

Level names: many programs name levels by letter, Greek letter or number, and those names do not always match school grades
What the charts show: only the grade or reading stage a source supports
Left out: Explode the Code, Moving Beyond the Page, Notgrass, Master Books, because we found no source tying their levels to grades