Exit rate answers a narrow web-analytics question: of all recorded views of a page, what percentage were the last view in a session? A page can receive an exit even when the visitor viewed several pages beforehand. That makes exit rate different from bounce rate, which is concerned with sessions that were not engaged under the analytics system's definition.
This calculator is useful when you already have a page's view and exit counts for the same property, date range and reporting setup. It turns those two counts into a percentage. The percentage needs context: leaving from an order-confirmation page is expected, while leaving midway through a checkout may point to a problem worth investigating.
