Routine outcome monitoring (ROM) is an important component of evidence‐based practice. To implement ROM in their practice, couple therapists need a brief measure that can quickly assess the relevant aspects of a couple's relationship. The Couple Relationship Scale (CRS) is a 10‐item measure of relational functioning that assesses emotional intimacy, commitment, trust, safety, cohesion, acceptance, conflict, physical intimacy, overall happiness, and personal well‐being. Three studies examined the initial psychometric properties of the CRS. Study One used a sample of 300 individuals to examine the concurrent validity, factor structure, and reliability of the CRS. In Study Two, 53 individuals completed the CRS twice to establish test‐retest reliability. In Study Three, 214 distressed individuals and 135 non‐distressed individuals were used to identify a clinical cutoff and reliable change index (RCI). Results indicated that the CRS has a strong concurrent and construct validity and good reliability. The clinical cutoff was 70.9 with an RCI of 16.