tech calculator
CDN Edge Caching & Egress Savings Calculator
Estimate origin egress bandwidth cost savings and CDN return on investment based on cache hit rate and request volume.
Formula Verified by Dr. James Callahan, PhD
Inputs
Traffic Details
KB
%
Cloud Provider Sizing
Origin & CDN setup
Results
Monthly Cost Savings
$11.65
Un-cached Origin Cost$321.87
Cached Total Cost (CDN)$310.22
Total Data Served3576 GB
Net CDN ROI
3.8%
Formula
CDN Egress savings formula
Savings = ( Egress_GB × Origin_Rate ) - [ ( Egress_GB × (1 - CHR) × Origin_Rate ) + ( Egress_GB × CHR × CDN_Rate ) + Request_Fees ]Models origin cloud egress cost savings subtracted by CDN traffic and requests delivery overhead.
Step by step
How the calculation works
- 1Define the monthly request volume in millions.
- 2Specify average payload size (KB) per asset request.
- 3Set your cache hit rate (CHR) target (percentage of edge requests handled by CDN).
- 4Choose the origin cloud provider configuration to load regional bandwidth prices.
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