CareerByteCode

Reserved Instance and Spot Savings Calculator

For cloud and FinOps engineers deciding between on-demand, commitments and spot. Enter the hourly rate, instance count and discounts to see the monthly cost of each option and the maximum saving.

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How to use

How to use the Reserved Instance Savings Calculator

  1. Enter the On-demand rate in dollars per hour and the number of Instances.
  2. Set the 1-yr reserved discount and 3-yr reserved discount percent.
  3. Set the Spot discount percent.
  4. Compare the monthly cost of each option and the maximum saving.
Worked example

An example, step by step

You enter

On-demand rate $0.192 per hour, 10 instances, 1-yr reserved discount 40 percent, 3-yr 62 percent, Spot 75 percent

The tool shows

On-demand $1,402 per month; 1-yr reserved $841; 3-yr reserved $533; Spot $350; Max monthly saving (spot) $1,051

FAQ

Questions about the Reserved Instance Savings Calculator

How much can reserved instances save compared to on-demand?

Typical published discounts run from about 30 to 40 percent for 1 year up to around 60 percent or more for 3 years, depending on the instance and payment option. Enter your provider's actual discount here.

When should I use spot instances instead of reserved?

Spot suits fault-tolerant, interruptible work such as CI jobs, batch and stateless services. Reserved instances or savings plans suit steady, always-on baselines.

Do savings plans work like reserved instances in this calculator?

Yes. Enter the savings plan discount in a reserved discount field, since both lower the hourly rate in exchange for a 1 or 3 year commitment.

Is the Reserved Instance Savings Calculator free and private?

Yes. It is free, needs no sign-up and runs entirely in your browser, so what you type is not uploaded. You only sign in if you want to email a result to yourself or save it to your CareerByteCode profile.

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