Amazon EC2 allows launching On-Demand Instances and pay as you go. This flexibility might make tracking your usage more challenging.  Fortunately, AWS offers an interactive usage report that can be accessed in the AWS Management Console: the EC2 Instance Usage Report. The report offers insights into instance usage and its patterns, giving you some helpful information to start optimizing your EC2 usage.  But the best way to track and optimize your usage is getting an intelligent cloud optimization solution that selects the best EC2 instances (including Spot Instances) and works to reduce your cloud bill by constantly looking for options matching your changing requirements.