CDN Bandwidth Savings Calculator
A CDN can serve some requests at edge locations rather than transferring every response from the origin. This scenario estimates transfer avoided from a user-supplied cache-hit share.
How to use this calculator
- Use the same time period and traffic boundary for transfer and cache share.
- Check that the input values use the same units and reporting period before comparing scenarios.
- Change one assumption at a time to see which input drives the result.
Formula and method
Estimated transfer avoided = baseline origin transfer × assumed cache-hit share.
- 1,200 × 0.72 = 864 GB estimated transfer avoided.
- A request-based cache-hit ratio is not the same as a byte-weighted cache-hit ratio. Provider pricing may include requests, minimums, regions and other dimensions.
Worked examples
Worked example
Assume 1,200 GB of monthly origin transfer and a 72% traffic-weighted cache-hit share.
1,200 × 0.72 = 864 GB estimated transfer avoided.
The scenario estimates 864 GB of transfer avoided each month.
Understanding the result
The scenario estimates 864 GB of transfer avoided each month.
A request-based cache-hit ratio is not the same as a byte-weighted cache-hit ratio. Provider pricing may include requests, minimums, regions and other dimensions.
Important notes
Use the same time period and traffic boundary for transfer and cache share.
The displayed result uses the entered assumptions; validate important estimates against source measurements, specifications or qualified guidance.
Frequently asked questions
Will savings equal the cost shown?
Only if the entered per-GB rate accurately represents avoidable billable traffic.
Does caching remove all origin traffic?
No. Dynamic paths, misses, purges and uncached assets may still reach the origin.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.