This online tool can be used to estimate the value of using the library. It calculates how much a library patron saved by borrowing library items. It’s also an environmental and societal tool, as it serves to remind libraries and patrons the value of reusing and sharing.
Some libraries automatically calculate it on each checkout receipt, and others host it as an app on their website. It was created by the Massachusetts Library Association and more information can be found through the American Library Association. The technical coding instructions are here.