The presented approach is simple and easily applicable using routine quantum chemistry tools. The approach only requires definition of two dimensions relevant for ET and PT, which we do in a way that disentangles them from other non-PCET relevant motions. This results in a potential energy landscape of PCET systems that directly corresponds to the widely known square scheme, and offers quantitative measures of coupling and concertedness. This perspective may be utilized, for instance, in chemical screening of systems relevant for (bio-)catalysis or energy conversion.