Browser Cache Bandwidth Savings Estimator
Estimate how much origin transfer a cache may avoid using request count, average response size and observed cache-hit rate.
How to use this calculator
- Enter eligible requests in period, average response size (kib), cache hit rate (%) and the remaining stated inputs; keep their units consistent.
- Review the result and intermediate values; change one input at a time when comparing scenarios.
- Keep the stated formula and assumptions with any result you share.
Formula and method
Avoided origin data ≈ requests × average response size × hit rate. This estimate converts KiB to GiB using 1,048,576 KiB per GiB.
- Approximately 280.15 GiB of origin transfer is avoided before other traffic effects.
- Use the same request population and byte measurement at each step. CDN cache hits, browser cache hits and billed egress may be measured differently.
Worked examples
Worked example
2.4 million eligible requests with a 180 KiB average response and a 68% hit rate.
Approximately 280.15 GiB of origin transfer is avoided before other traffic effects.
Approximately 280.15 GiB of origin transfer is avoided before other traffic effects.
Understanding the result
Approximately 280.15 GiB of origin transfer is avoided before other traffic effects.
Use the same request population and byte measurement at each step. CDN cache hits, browser cache hits and billed egress may be measured differently.
Important notes
Use the same request population and byte measurement at each step. CDN cache hits, browser cache hits and billed egress may be measured differently.
Use measured inputs and verify that the model matches the situation before making an operational, financial or technical decision.
Frequently asked questions
Does browser caching always reduce origin egress?
Not all assets are cacheable, and cache validation requests may still reach the origin.
Is the cost saving guaranteed?
No. Apply your actual billing model, allowances and cache behavior.
What should I check before relying on this result?
Verify units, input definitions and assumptions against your real data or the relevant product, service or professional guidance.
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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.