Did any of you horsepower calculator guys ever use this

Mine came out close to what I think I have (no dyno, just racetrack numbers)....RPM sounded a little high (almost 6900rpm). Side note: the compression calculator for determining dynamic compression said I had 15:1 static.....eh....no, lol.

Edit: it said I have 581hp....which is close to what my ET/MPH says.