Flipped classrooms have a significant positive effect on K–12 students

 Flipped classrooms (FCs) in K–12 schools are growing in popularity. However, previous studies have reported inconsistent findings on the effects of FCs, and the conditions under which FCs are effective remain unclear. This three-level meta-analysis synthesized the effects of FCs versus traditional classrooms (TCs) on various learning domains among K–12 students based on 129 studies with 399 effect sizes (N = 12,727). The results revealed that FCs have a significant positive effect on K–12 students’ overall performance (without outliers: g = 0.53 [0.44,0.62], 95% prediction interval [–0.60, 1.66]) and on both the cognitive domain and the affective domain.