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Difficulty: HardEstimating GCP Costs with the Pricing Calculator

A cloud engineer is using the Google Cloud Pricing Calculator to estimate the monthly cost of a data processing cluster. The cluster consists of 10 `n2-standard-4` Compute Engine instances running continuously for a 730-hour month at a base rate of 0.20perhourperinstance.Theworkloadutilizesa3−yearCommittedUseDiscount(CUD)offeringa550.20 per hour per instance. The workload utilizes a 3-year Committed Use Discount (CUD) offering a 55% discount on compute instance pricing. Each instance is attached to a 200 GB Standard Persistent Disk billed at 0.04 per GB per month. Additionally, the cluster transfers 500 GB of egress data to the internet per month, where the first 10 GB is free of charge and subsequent egress is billed at $0.12 per GB. What is the net estimated total monthly cost in USD for this architecture?

Answer: 795.8 USD

Answer

The net estimated total monthly cost is $795.80.
To determine the net monthly cost, each GCP component must be calculated individually based on pricing rules: Compute Engine VMs equal 10×730 hours×$0.20=$1,460.0010 \times 730 \text{ hours} \times \$0.20 = \$1,460.00 base cost, reduced by 55%55\% via CUD to $657.00\$657.00. Storage cost for 10×200 GB=2,000 GB10 \times 200\text{ GB} = 2,000\text{ GB} at $0.04/GB\$0.04/\text{GB} is $80.00\$80.00. Internet egress cost for (500−10) GB=490 GB(500 - 10)\text{ GB} = 490\text{ GB} at $0.12/GB\$0.12/\text{GB} is $58.80\$58.80. Summing these three components yields $657.00+$80.00+$58.80=$795.80\$657.00 + \$80.00 + \$58.80 = \$795.80.

Step-by-Step Solution

1
Calculate the discounted Compute Engine VM cost
$657.00
Base VM cost is 10 instances * 730 hours * 0.20/hr=0.20/hr = 1,460.00. Applying the 55% Committed Use Discount gives 1,460.00∗(1−0.55)=1,460.00 * (1 - 0.55) = 657.00.
2
Calculate the Standard Persistent Disk cost
$80.00
10 instances attached to 200 GB disks equal 2,000 GB total storage. 2,000 GB * 0.04/GB=0.04/GB = 80.00. Persistent disk storage is not eligible for Compute CUDs.
3
Calculate the net Internet egress cost
$58.80
The total egress of 500 GB minus the 10 GB monthly free tier leaves 490 billable GB. 490 GB * 0.12/GB=0.12/GB = 58.80.
4
Sum all monthly cost components
$795.80
Total cost = 657.00(Compute)+657.00 (Compute) + 80.00 (Storage) + 58.80(NetworkEgress)=58.80 (Network Egress) = 795.80.

Key Concept

Calculating GCP net monthly infrastructure cost taking into account Compute CUD scope, persistent storage pricing, and internet egress free tier allowances.
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Estimating GCP Costs with the Pricing Calculator

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