GCP - Loadbalancer pricing when using nginx ingress controller

How to calculate the pricing for GCP loadbalancers when using nginx ingress controller?

Right now I have 1 Ingress host and a single rule for prod website. But I want to launch another for internal services both gitlab, jenkins.

Is the cost calculated based on the number of path's we have in ingress? Or number of load balancers like AWS? I'm assuming each rule in GCP calculator means a path in ingress.

If you are using NGINX Ingress Controller like here, then your are only billed for your GKE cluster.
Please have a look at GKE pricing:

GKE uses Compute Engine instances for worker nodes in the cluster. You are billed for each of those instances according to Compute Engine's pricing, until the nodes are deleted. Compute Engine resources are billed on a per-second basis with a one-minute minimum usage cost.

In addition, be aware of networking pricing, more information can be found in the documentation here.

You can also estimate the cost yourself with this Google Products Calculator