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Server Sizing & Capacity Calculator

Calculate recommended CPU cores and RAM for your server based on current utilization, peak multiplier, and safety buffer.

Current average CPU utilization percentage on your existing server.
Number of vCPU cores on your current server.
Current RAM in gigabytes on your server.
How many times peak traffic exceeds average (e.g., 2 = double at peak).
Extra headroom % to add on top of the peak requirement.

Results

Recommended CPU Cores28
Recommended RAM77 GB RAM
Peak Utilization140%

📖What is it?

For informational/educational purposes only. Right-sizing servers prevents both under-provisioning (degraded performance) and over-provisioning (wasted cost). This calculator scales your current resources to handle peak traffic with a safety buffer.

🎯How to use

Enter your current CPU utilization percentage and core count, current RAM, expected peak traffic multiplier, and desired safety buffer. The calculator recommends the CPU and RAM needed for comfortable peak operation.

💡Example scenario

8 cores at 70% avg utilization. For 2� peak with 20% buffer: required cores = ceil(8 � (100/70) � 2 � 1.2) = ceil(27.4) = 28 cores. RAM: ceil(32 � 2 � 1.2) = 77 GB (round to 80 GB).

🏆Pro tip

Use auto-scaling groups in cloud environments to dynamically adjust capacity, reducing the need for permanent over-provisioning. Monitor p95/p99 latency (not just average) to catch performance issues before users do.