STL · OBJ · STEP · IGES · 3DM → total surface area in square feet
Drop a 3D model here or add one to the job.
Big files are fine. You’ll see the size, surface area and a price in about a minute.
The other files load as pieces, each priced as its own block. If you pick a whole model, its surface sets the area for finishing; the pieces' flat seam faces aren't counted.