BFG Carpet Knife Cutter - 45mm Diameter Blade, Disc Cutter with Hand and Surface Protection, Durable ABS Handle, Great for Sizing Carpet, Linoleum, Other Floor Covering, and Cutting Cardboard

I brought this to cut carpet, which it did admirably. I guess it may struggle with heavy or shag pile carpet but for the price and ease of use I cannot fault it. Also have since cut card too, nice clean cut. Anything better would have to be an industrial quality (and price to match)

Cuts through cardboard but cannot cut through thick carpet.. OLFA brand better

save your money absolute rubbish does not cut through thin carpet v

Makes cutting carpet much easier