CDN Bandwidth Calculator
Estimate CDN egress, origin fetch volume after cache hits, and directional monthly cost versus serving everything from origin.
CDN Bandwidth Calculator
Estimate monthly CDN egress, origin fetch traffic after cache hits, and rough cost savings vs origin-only delivery.
Simplified global average pricing. Real CDN bills vary by region tiers, reserved capacity, and invalidation — treat this as directional planning.
Core Relationships
Total GB ≈ requests × object_size
Origin GB ≈ total × (1 − hit_ratio)
CDN bill ≈ CDN egress + request charges + origin fetch egress
Raising Hit Ratio
- Longer TTLs for immutable versioned assets (
app.js?v=hash) - Avoid forwarding unnecessary cookies/query strings
- Compress and resize images at the edge when appropriate
- Separate APIs from static sites so APIs do not poison cache metrics
Regional price tiers and committed use discounts change real invoices — use this tool for architecture tradeoffs, not finance-ready quotes.