ACT and SAT conversion from two anchor rows
Official concordance tables that line up ACT and SAT scores do exist, but each published edition attaches slightly different SAT figures to the same ACT score. This page therefore builds in no particular edition. Instead you pick two rows from the table in front of you, enter the ACT and SAT value on each row, and the conversion runs along the straight line through those two points. Whatever table you use, the answer matches that table, and swapping tables changes the answer with it.
How the numbers are worked out
This is plain interpolation on the line through your two anchors. The formula that was applied is printed in the results, so you can see exactly which arithmetic produced the number. Converting to SAT rounds to the nearest 10 points; converting to ACT rounds to a whole point. A score between the anchors is marked as interpolation, a score equal to an anchor returns the table value itself, and a score outside the anchors is marked as extrapolation and less reliable. If a converted score lands outside the valid range, it is pulled back to the edge and the page says so.
What this page does not do
It supplies no authoritative conversion table and does not decide which edition is correct. Section-level conversion and admission chances are not supported.
Frequently Asked Questions
College Board and ACT publish a joint concordance, but the figures differ between editions and get updated. This page builds in no single edition and uses only the anchor values you enter.
Take two different rows from the table you are reading and enter the ACT and SAT value from each row. Picking two rows that bracket your score keeps the calculation inside the interpolation range.
It will still compute, but that extends the line beyond your anchors, so it is extrapolation and less reliable. The result says so, and picking closer anchors is usually better.