Cost Optimization Score: one number for waste and execution maturity
Total identified savings tells you how much is on the table. It does not tell you how wasteful you are, or how well you act. One blended score does both.
Ask most cloud cost dashboards "how are we doing?" and they answer with total identified savings, the size of the opportunity in front of you. It is a useful number, but on its own it is misleading. A growing identified-savings figure can mean you are getting more wasteful, or just that your tooling got louder. It says nothing about whether you are acting.
What leadership actually wants is a single answer to two questions at once: how wasteful is our spend today, and how well are we acting on what we find? That is what a Cost Optimization Score is for.
Two halves: waste ratio and realisation rate
The score blends two measures, weighted evenly. The first is your waste ratio, identified savings as a share of total spend, which captures how much avoidable cost is sitting in the estate right now. The second is your realisation rate, how much of what you identify you actually turn into verified savings, which captures how good you are at acting.
Why blend them
Either number alone can flatter or mislead. Low waste but a terrible realisation rate means you are coasting on a clean estate and would not cope if it got messy. High waste but a strong realisation rate means you have plenty to fix and you are fixing it fast, a program on the way up. Blending the two rewards the behaviour you actually want: a lean estate and the operational muscle to keep it that way.
How to use it
- Trend it monthly. A single reading is noise; the direction is the signal.
- Compare across teams and accounts, so accountability lands where the spend lives.
- Put it on the first slide of the monthly review, ahead of the raw savings figures.
- Treat a falling score as an early warning: usually it is realisation rate slipping before the bill reacts.
Used this way, the score turns cost optimisation from a pile of disconnected recommendations into something you can manage like any other operational metric: one number, trended, owned, and reviewed.