Below is a live calculator file, generated by the Calculator Builder from the cleaning-trade example — the exact single file a buyer downloads, unchanged. It's running inside this page the same way it would run inside yours: no account, no hosted service, nothing calling home. Change quantities, tick add-ons, switch the cleaning frequency and watch the estimate update. The "Email this quote" button composes a real email in your mail app, so you can see exactly what your customers would send you.
Want one with your business name, your services and your prices on your own website?