LearnGlossary

What is effective savings rate (ESR)?

Updated 26 October 2026 · Published by Zoorik

Effective savings rate (ESR) is the percentage of your list cost that discounts saved. It counts negotiated discounts from your contract. It also counts commitment discounts, such as reservations and savings plans.

How ESR is worked out

To work out the effective savings rate, FinOps tools such as Microsoft’s toolkit compare three costs:

  • List cost: what you’d pay with no discounts.
  • Contracted cost: list cost minus negotiated discounts.
  • Effective cost: what you pay after all discounts, with commitment purchases spread over their term.

ESR is total savings, the gap between list and effective cost, divided by list cost. Leave out commitment purchases, or they skew the result.

An example

Say a month’s list cost is $1,000. Negotiated discounts save $100, so the contracted cost is $900. Commitment discounts save $200 more, so the effective cost is $700.

That’s $300 saved on $1,000 of list cost, an ESR of 30%.

$300 saved on $1,000 of list cost is an ESR of 30% Illustration of the page's example month, five rows on one shared scale from $0 to $1,000. List cost, $1,000, fills the whole width. Negotiated discounts, minus $100, is an amber span from $900 to $1,000. Contracted cost, $900, runs from $0 to $900. Commitment discounts, minus $200, is an amber span from $700 to $900. Effective cost, $700, runs from $0 to $700. A bracket from $700 to $1,000 reads Total savings, $300, and ESR = $300 / $1,000 = 30%. $300 saved on $1,000 of list cost is an ESR of 30% List cost$1,000Negotiated discounts−$100Contracted cost$900Commitment discounts−$200Effective cost$700Total savings$300ESR = $300 / $1,000 = 30%
Illustration of the page’s example month: each discount takes its amount off the cost above it, and ESR divides the $300 saved by the $1,000 list cost.

Why it matters for your cloud cost

  • ESR shows the effect of all your discounts as one percentage.
  • Unused commitments still cost you, so they reduce ESR.
  • Effective cost above list cost gives negative savings, and a negative ESR.
  • A high ESR doesn’t mean a low cloud cost. Discounts reduce unit prices. Using fewer resources is the other half of how to reduce cloud costs.
  • The free assessment works out what your clusters and disks could save.

Read next: How to reduce cloud costs

Sources: Microsoft Learn, “Common terms” (opens in a new tab) (FinOps toolkit); Microsoft Learn, “Understanding savings calculations in FinOps toolkit” (opens in a new tab); Microsoft Learn, “FinOps toolkit Rate optimization report” (opens in a new tab).

Find your own number

One line in your cloud console. One PDF report with your estimated saving at list price.

Estimate your saving

Talk to the builders

Thirty minutes with the people who build Coral and Amoeba.

Book a demo (opens in a new tab)

Or write to founders@zoorik.com