Garbage in, fantasy out. That is both the promise and the trap of an AR ROI calculator. - A decent one asks for the right inputs: 3D model costs per SKU, monthly traffic, average margin, expected conversion lift, return reduction. - Feed it guesses and it hands you back a fantasy with decimal points. - Where these tools genuinely help is discipline: they force the uncomfortable inputs. What if the lift is half the famous case study's. - The good ones let you slide the assumptions and watch the payback period move. That is the whole point. - No calculator can supply the lift figure. It does not know your category. - For that you need published benchmarks: ARCommerce's database has 68 brands with the conversion figures they actually published. - The best calculator is the one you actually use. A plain spreadsheet with your real margins beats a slick app fed with fantasy inputs. ModelSnap produces the 3D model and AR preview file, $4.99 per HD model.