Try “cost explorer”. This is AWS’s official interface/api for navigating your spend. It lets you view the amortized cost of reserved instances over their term.

Try “cost explorer”. This is AWS’s official interface/api for navigating your spend. It lets you view the amortized cost of reserved instances over their term. The best part is that the numbers always add up. We used to use a third party service to analyze our AWS usage but we could never match up their numbers to anything - completely finger in the wind. Cost Explorer also gives recommendations for instance usage but we mostly ignore it because the stuff it suggests, while completely accurate, doesn’t match business need to be able to absorb spikes in usage.