Amazon EC2 Free tier - how many instances can I run

Question

I am running a single instance t1.micro to host centos with an open source ERP program Now I wish to also host another instance with a 2nd ERP program. Will this be within my free tier limit.

Is there a count on the no# of instance I can use/start?

How many elastic Ip's can I associate?

Answer 1

For Question #1: Number of Instances

Amazon charges based on hours of usage, not based on the number of instances you're running. Check this Amazon AWS Free tier details - https://aws.amazon.com/free.

It is clearly mentioned that the free tier includes:

1. 750 hours of Amazon EC2 Linux/UNIX or RHEL or SLES micro Instance usage (613 MB of memory and 32-bit and 64-bit platform support) – enough hours to run continuously every month*
2. 750 hours of Amazon EC2 Microsoft Windows Server Micro Instance usage (613 MB of memory and 32-bit and 64-bit platform support) – enough hours to run continuously each month*
3. 750 hours of an Elastic Load Balancer and 15 GB data processing*
4. 30 GB of Amazon EBS, plus 2 million I/Os and 1 GB of snapshot storage

For Question #2: Elastic IP addresses

Allocating and using 1 Elastic IP addresses per instance is typically free, but not when the Elastic IP address is not currently associated with any instance, see section Elastic IP Addresses on page Amazon EC2 Pricing:

• $0.00 for one Elastic IP address related to a running instance
• $0.005 per extra Elastic IP address associated with a running instance per hour on a pro rata basis
• $0.005 per Elastic IP address not related to a running instance per hour on a pro rata basis
• $0.00 per Elastic IP address remap for the first one hundred remaps per month
• $0.10 per Elastic IP address remap for added remaps over 100 per month