The standard HR-to-employee ratio is 1.4 full-time HR professionals per 100 workers. However, this can change depending on your organization's needs. For instance, if your company employs only 15 workers, one HR staff may be enough to handle all HR functions. But it could also be possible that your company won't have any HR staff. In contrast, some organizations with 500 employees may only have one HR employee. More than the headcount, the important thing is that responsibilities are taken care of.