Aligning Khan Academy content to national or state curricula and standards is mainly done by volunteers. Thank you to those who have contributed and made them available free to the world!
The New England Board of Higher Education kindly shared their mapping of Accuplacer content to Khan Academy and developmental math content to Khan Academy's library (2013)
CollegeTrack kindly shared their mapping of ACT content to Khan Academy's library (2012)
Portugal Telecom has done a partial mapping of Portuguese-translated Khan Academy content to grade levels in the country. See the mapping to English content here.
Other curricula mappings
If you have a mapping that can benefit others, we welcome contributions for other curricula mappings. If you have a mapping to share, send implementations at khanacademy.org a spreadsheet with Khan Academy's video and exercise libraries mapped against other curricular standards.