semPower allows for performing compromise, a priori, and post hoc power analyses for structural equation models. The R-package is available from CRAN [], its source from github []. Alternatively, you can use semPower online at

For more details see the manual [], for details on using compromise power analyses in model testing, see:

Moshagen, M., & Erdfelder (2015). A new strategy for testing structural equation models. Structural Equation Modeling, 23(1), 1–7. doi: 10.1080/10705511.2014.950896