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AWS S3 vs. Cloudflare R2 Cloud Storage & Egress Bandwidth Cost Calculator

Audit monthly storage bills, Class A/B API request charges, and egress bandwidth penalties across AWS S3, Cloudflare R2, Google Cloud Storage, and Backblaze B2.

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How to Use the S3 vs R2 Egress Calculator

  1. STEP 01
    Specify your total stored data volume in Gigabytes (e.g., 8,000 GB for 8 TB) and monthly outbound egress download bandwidth in Gigabytes (e.g., 35,000 GB for 35 TB).
  2. STEP 02
    Optionally supply your estimated monthly Class A (PUT/LIST) and Class B (GET/HEAD) object operations.
  3. STEP 03
    Compare your net monthly and annual cloud bills across Cloudflare R2, AWS S3 Standard, Google Cloud Storage, and Backblaze B2 to see total dollar savings.

Frequently Asked Questions (S3 vs R2 Egress Calculator)

Why does Cloudflare R2 have zero egress bandwidth fees?

Cloudflare leverages its private global Anycast network and fiber backbone to eliminate data egress transit charges entirely, charging only for stored volume ($0.015/GB/mo) and API operations. In contrast, AWS S3 charges $0.09/GB for data downloaded to the internet.

Is Cloudflare R2 S3-compatible?

Yes. Cloudflare R2 implements the standard AWS S3 API specification, allowing existing AWS SDKs, boto3 scripts, and S3-compatible CLI tools to point to R2 simply by changing the endpoint URL and credentials.