Your question is somewhat meaningless - or perhaps better said: you're asking the wrong question.
The meaning of Honors varies so much between schools. At some schools, 15% get honors. At others, 85% get honors. One school was Honors / Fail during COVID. So "converting" A/B/C to H/HP/P is much less important than what the grade distribution is at your school, and what you get.
And don't get me started on the school that now has High Honors / Honors / Almost Honors.