re hbp bb big cat stevet eskimo com steven thornton writes the official mlb formula for obp is hits plus walks plus hit by pitch divided by at bats plus walks plus hit by pitch plus sacrifice flies sac bunts and errors have no effect source total baseball and they sure they might if an error is recorded on for example a ground ball ie the batter would otherwise be out it is officially a hitless at bat if it s some other type of error greenwell lets a single go by it doesn t effect the obp but most errors are counted cuz
