Does bandwidth between droplets using private ip’s count against you?
These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.
No it does not - Only data transfer on the public network interface will count against your bandwidth allowance.
From the documentation:
https://www.digitalocean.com/docs/billing/bandwidth/
Also - you can use this bandwidth calculator to estimate your bandwidth allowance and overage cost based on Droplet configuration.