CDN Cache Hit Ratio, Origin Bandwidth Offload & Egress Cost Calculator

See how improving CDN Cache Hit Ratio cuts origin bandwidth and cloud egress bills.

Monthly Cloud Egress Savings
7,176 USD/mo
Origin Server Egress Traffic 9.6 TB/mo
CDN Edge Offloaded Traffic 110.4 TB/mo
Total Monthly Bill (CDN + Origin) 3,024 USD/mo
Inputs
TB/mo
Total monthly edge data transfer delivered to end users (TB).
%
CDN Cache Hit Ratio percentage (CHR %).
USD/GB
Cloud origin egress price per GB ($/GB).
USD/GB
CDN edge delivery price per GB ($/GB).
Results & Graph
Monthly Cloud Egress Savings
7,176 USD/mo
Origin Server Egress Traffic
9.6 TB/mo
CDN Edge Offloaded Traffic
110.4 TB/mo
Total Monthly Bill (CDN + Origin)
3,024 USD/mo

Monthly Cloud Egress Savings

Graph 1 • Total Monthly Traffic Tb Sensitivity Recalculates the domain equation across 50% to 150% of the primary input while holding other parameters constant.
0 USD/mo 5.8k USD/mo 11.6k USD/mo 50%: 3,588 USD/mo 3.6k 50% 75%: 5,382 USD/mo 5.4k 75% 100%: 7,176 USD/mo 7.2k 100% 125%: 8,970 USD/mo 9.0k 125% 150%: 10,764 USD/mo 10.8k 150%
Graph 2 • Primary & Supporting Metric Comparison Compares the primary output alongside supporting domain benchmarks.
Monthly Cloud Egress Savings 7,176 USD/mo Origin Server Egress Traffic 9.6 TB/mo CDN Edge Offloaded Traffic 110.4 TB/mo Total Monthly Bill (CDN + Origin) 3,024 USD/mo
Graph 3 • Exact Output Table & Units Displays each calculated output in its exact domain unit.
Monthly Cloud Egress Savings7,176 USD/moOrigin Server Egress Traffic9.6 TB/moCDN Edge Offloaded Traffic110.4 TB/moTotal Monthly Bill (CDN + Origin)3,024 USD/mo
Summary: At 92% Cache Hit Ratio on 120 TB/mo, CDN offloads 110.4 TB and cuts origin egress to 9.6 TB, saving $7176/month.
Summary: At 92% Cache Hit Ratio on 120 TB/mo, CDN offloads 110.4 TB and cuts origin egress to 9.6 TB, saving $7176/month.
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Interactive chart & math engine powered by CalculatorGraph

Formula & Mathematical Methodology: CDN Cache Offload Systems Engineering Formula

EdgeServedTB = TotalTrafficTB × (CHR% / 100)
OriginEgressTB = TotalTrafficTB × (1 − CHR% / 100)
EdgeServed_TB = TotalTraffic_TB × (CHR% / 100); OriginEgress_TB = TotalTraffic_TB × (1 − CHR% / 100)
  • totalMonthlyTrafficTb: Total Monthly Traffic Tb (TB/mo)
  • cacheHitRatioPct: Cache Hit Ratio Pct (%)
  • originEgressCostPerGb: Origin Egress Cost Per Gb (USD/GB)
  • cdnEdgeCostPerGb: Cdn Edge Cost Per Gb (USD/GB)

Rounding: Binary/decimal capacities and engineering metrics retain full floating-point precision and round to 2 decimal places.

Worked Example: Architecture Sizing Example: CDN Cache Offload

See how improving CDN Cache Hit Ratio cuts origin bandwidth and cloud egress bills.

  1. Enter the workload parameters, model dimensions, or network link specifications.
  2. Compute the sizing equation: EdgeServed_TB = TotalTraffic_TB × (CHR% / 100); OriginEgress_TB = TotalTraffic_TB × (1 − CHR% / 100).
  3. Inspect the primary capacity metric, headroom buffers, and 3 SVG visualizations.
Result: Calculates CDN Cache Offload via EdgeServed_TB = TotalTraffic_TB × (CHR% / 100); OriginEgress_TB = TotalTraffic_TB × (1 − CHR% / 100).

Frequently Asked Questions

How does the CDN Cache Hit Ratio, Origin Bandwidth Offload & Egress Cost Calculator compute capacity?

It evaluates EdgeServed_TB = TotalTraffic_TB × (CHR% / 100); OriginEgress_TB = TotalTraffic_TB × (1 − CHR% / 100) directly in your browser and plots three custom SVG diagrams.

Can I compare different cluster or model configurations side by side?

Yes. Use the "Compare (0/3)" button in the results panel to pin up to three configurations.

Does this tool upload any of my architecture parameters?

No. All calculations run 100% client-side in your browser.

Developer Tools · Cloud SRE & Distributed Systems

CDN Cache Hit Ratio, Origin Bandwidth Offload & Egress Cost Calculator: inputs, method, and how to read the result

See how improving CDN Cache Hit Ratio cuts origin bandwidth and cloud egress bills.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Total Monthly Traffic Tb: Total monthly edge data transfer delivered to end users (TB).
  • Cache Hit Ratio Pct: CDN Cache Hit Ratio percentage (CHR %).
  • Origin Egress Cost Per Gb: Cloud origin egress price per GB ($/GB).
  • Cdn Edge Cost Per Gb: CDN edge delivery price per GB ($/GB).

What the calculation includes

With the default values shown, Monthly Cloud Egress Savings is 7,176 USD/mo. The calculation follows CDN Cache Offload Systems Engineering Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Total Monthly Traffic Tb from 120 TB/mo to 132 TB/mo changes Monthly Cloud Egress Savings from 7,176 USD/mo to 7,893.6 USD/mo. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses industry-standard IEEE, IETF RFC, and GPU/cloud hardware sizing conventions.
  • Capacity planning estimate; benchmark under production traffic patterns before finalizing cluster or hardware procurement.

Scope: IEEE / IETF / Cloud Systems Engineering Standard Check the assumptions and limitations against your situation before relying on the estimate.

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