Signup Rate

Signup rate measures the percentage of visitors, installers, or leads who complete account creation — a specific funnel-step conversion rate, not a single universal metric.

This is really a family of related step-conversion metrics rather than one fixed formula — install-to-signup rate (for apps), visit-to-signup rate (for web), and signup-to-purchase rate (the next step after registration) are all variants of the same underlying idea applied at different funnel stages. See funnel conversion rate for the general concept these all belong to.