Estimates you have saved from the calculator — the material, the square footage and what it came to. Reopen one to change it, or start another.
Projects are stored in your browser on the device you saved them on. There is no account to create and nothing is uploaded — we never see them, because they never leave your phone or computer.
That cuts both ways, and it is worth knowing before you rely on it. A project saved on your phone will not appear on your laptop. Clearing your browsing data clears them too, and so does opening the site in a private window. If an estimate matters, use Print or Save as PDF on the calculator to keep a copy of your own.
Prices move. When you reopen a project the calculator recalculates it against current rates rather than replaying the old total, so a number that has shifted since you saved it is telling you something real.