Infrastructure Utilization Calculator

Score CPU, memory, storage and network utilisation together to find stranded capacity and the annual cost of the waste.

About Infrastructure Utilization Calculator

Utilisation is only meaningful alongside balance. An estate at 42% CPU and 78% memory is not half empty — it is memory bound with stranded CPU that cannot be sold, because the next VM needs both. The spread between the highest and lowest resource is therefore a better refresh signal than any single average. Stranded capacity is fully paid for and unusable, so the balance score points directly at what the next hardware refresh should change — more memory per socket rather than more sockets, for instance. Replace the cost figure with your own fully loaded annual spend.

Formula

Infrastructure Utilization

overall = CPU × 0.35 + memory × 0.35 + storage × 0.20 + network × 0.10; stranded = target − overall; waste = annual cost × stranded ÷ 100.

overall utilisation: Weighted blend, with CPU and memory carrying most of the weight
stranded capacity: Gap between target and actual utilisation that you are still paying for
balance score: 100 minus the spread between the highest and lowest resource

Worked example

With the default values below, Infrastructure Utilization Calculator returns Overall Utilisation of 56.0%. Change any input above and every figure here is recalculated in your browser.

Inputs used

CPU utilisationaccepts 0–100 %: 42 %
Memory utilisationaccepts 0–100 %: 78 %
Storage utilisationaccepts 0–100 %: 61 %
Network utilisationaccepts 0–100 %: 18 %
Target utilisationaccepts 20–95 %: 75 %
Annual infrastructure costaccepts 0–1,000,000,000 USD: 480,000 USD

Results

Overall Utilisation: 56.0%
Stranded Capacity: 19.0%
Annual Cost of Stranded Capacity: $91,200.00
Resource Balance Score: 28 / 100
Most Under-used Resource: Network at 18% against Memory at 78%
Utilisation Grade: D — Weak

Step by step

1Values used
2Infrastructure Utilization
3Overall Utilisation= 56.0
4Stranded Capacity= 19.0
5Annual Cost of Stranded Capacity= 91,200.00
6Resource Balance Score= 28 / 100
7Most Under-used Resource= Network at 18% against Memory at 78%
8Utilisation Grade= D — Weak

Assumptions and limits

The result is derived only from the 6 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation or tax into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Infrastructure Utilization calculated?

overall = CPU × 0.35 + memory × 0.35 + storage × 0.20 + network × 0.10; stranded = target − overall; waste = annual cost × stranded ÷ 100. Utilisation is only meaningful alongside balance. An estate at 42% CPU and 78% memory is not half empty — it is memory bound with stranded CPU that cannot be sold, because the next VM needs both. The spread between the highest and lowest resource is therefore a better refresh signal than any single average.

Why does Infrastructure Utilization matter?

Stranded capacity is fully paid for and unusable, so the balance score points directly at what the next hardware refresh should change — more memory per socket rather than more sockets, for instance. Replace the cost figure with your own fully loaded annual spend.

What values do I need to enter?

This calculator takes 6 inputs: CPU utilisation, Memory utilisation, Storage utilisation, Network utilisation, Target utilisation, Annual infrastructure cost. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

Why is 100% utilisation not the target?

Failover capacity, scheduling headroom and burst absorption all live in the unused fraction. A target of 70-80% is the practical optimum: below it you are wasting money, above it a single host failure or workload spike has nowhere to go.