Hi, dmilne38 Welcome to MR Insiders. When you are viewing a property's website, click on the link at the top that says, "Marriott Rewards Points." The next page that opens up will tell you the hotel's category, and the chart will show you how many points are required per night(s) for that category.
I would also lile to say welcome to Insiders as well. Foxglove did a good job covering points needed for hotel categories. Something else you can do is on the Reservations Page (marriott.com) when you are searching for a hotel click on the "Use Rewards" Points box and it will show you how many points are required for the hotel stay prior to making the reservation.