@18college1111 If you got 231, you may have miscalculated since 228 is the highest possible SI.
For the purposes of calculating your PSAT SI, SAT subscores are capped at 38. Even if you got a 39 or 40 on a particular section, you’ll have to use 38 for the SI conversion.
Either way, it sounds like you have a fabulous score. Congrats!