Im no expert in AWS resource calculation but the above reply is probably wrong.
Currently i use Knownhost vps-3 plan @ $42.5
Amazon EC2 Service 46.57
Cpmpute: 38.07 (4G RAM calculator does not have 3G)
AWS Data Transfer Out: 809.91
EBS Volume: 8.07 ( just used standard SSD)
Discount: 4.26 ( for first 12 months)
Total: $852.22
AWS is pay for what you use so this figure would be if you used the actual resources 100%
You got the same answers on WHT just FYI