# Calculating ICC using random intercept and residual variances

I have seen many posts refer to the calculation of the ICC by utilizing the variance of the random intercept and the residual variance from a multilevel model. Does anyone have this formula handy?

$$\text{ICC} = \frac{\sigma^2_{\text{intercepts}}}{\sigma^2_\text{intercepts} + \sigma^2_\text{residuals}}$$