Sizing Kubernetes clusters, at best, can be compared to throwing darts at a dartboard, in the dark. However our enterprise-tested rules and tips can shine a little light on the dartboard and help you have enough capacity for your apps. In this lightning talk, we will go over some tips to help you throw a bullseye for sizing your clusters. A unique demo will accompany this talk. Don't throw darts in the dark -- Kube at scale is possible.