There isn't a simple way, but you can go here to get 2017 rates for all resorts in all "seasons":
http://www.wdwinfo.com/wdwinfo/disney-rates.htm For a family of max 4 at Pop Century, in a basic room, it is essentially the same as what you are paying for a preferred spot at Ft. Wilderness. The thing I always point out is that Fort Wilderness has the amenities generally associated with moderate or deluxe resorts, for example a water slide, a sit down restaurant, and special transportation (the boats to MK). You also get easy access to the deluxe resorts through the launches and monorail, as well as a dinner show on property, which only the Polynesian can match.
I've never really understood people that treat Fort Wilderness as a campground only. It's a nice campground, but for that purpose it is extremely expensive in my opinion. I know of cheaper places to stay that offer similar amenities (though perhaps not with Disney style!). But I will maintain that as an onsite property, in other words a resort to get the benefits of being onsite including Extra Magic Hours, earliest FP+ reservations, transportation, Disney attention to detail and more, The Fort is a tremendous value. It is priced as a basic value, sometimes a bit less and sometimes a bit more (especially if the values have discounts or dining attached), but it has the amenities of at least a moderate and close to a deluxe. Excluding Mousekeeping of course!
Other people obviously feel different. There are people that just stay at Ft. Wilderness because they love it. I don't get it, but that is what makes the world go round!