How many calories would you guess are in this salad?

My husband and I are in love with this salad we had at a local eatery but we're curious as to how many calories there are in it. It's a large salad. It is enough for 4 people as side salads or two people for meals. We split it. Anyway, here are the ingredients: shredded lettuce, penne pasta, diced tomato, crumbled feta cheese, shredded cheddar cheese, red onion, grilled chicken , ranch dressing. It also comes with grilled pita bread on the side. The grilled chicken has some sort of a sweet seasoning on it. We have no clue what it is. It makes the chicken brown. So, how many calories?