Why are AWS S3 egress fees so expensive compared to storage?

Amazon S3 charges approximately $0.023 per GB for storage, but charges up to $0.09 per GB (about $90 per Terabyte) for internet data egress after the first 100GB. On high-traffic media sites, egress fees frequently account for over 80% of the total monthly AWS bill.

How does Cloudflare R2 offer $0 egress fees?

Cloudflare R2 leverages Cloudflare's global Anycast edge network and transit peering infrastructure to eliminate data transfer fees entirely. Users only pay for data stored ($0.015/GB/mo) and API operations (Class A write/list and Class B read).

What are Class A and Class B API operations in object storage?

Class A operations modify or query bucket metadata (such as PUT, POST, COPY, LIST) and carry higher per-request fees (e.g. $0.0045 to $0.005 per 1,000 requests). Class B operations read objects (such as GET) and are billed at significantly lower rates (e.g. $0.0004 to $0.0005 per 10,000 requests).

Is Backblaze B2 compatible with Amazon S3 SDKs and tools?

Yes. Both Backblaze B2 and Cloudflare R2 provide full S3-compatible REST APIs, allowing developers to use existing AWS SDKs, Cyberduck, rclone, and terraform scripts by simply updating the endpoint URL and credentials.

What is free egress via the Bandwidth Alliance?

The Bandwidth Alliance is an agreement between Cloudflare and partners like Backblaze, Microsoft Azure, and Oracle Cloud that waives or drastically discounts data transfer fees between their interconnected networks.

Business & Finance

Cloud Object Storage & Egress Cost Calculator: AWS S3 vs Cloudflare R2 vs Backblaze B2

Name: Multi-Cloud Object Storage (S3 vs R2 vs B2) Egress Cost Calculator
Author: AnshuTechy

Compare monthly cloud object storage, API operation fees (Class A / Class B), and data egress bandwidth bills across Amazon Web Services S3 Standard, Cloudflare R2 ($0 egress), Backblaze B2, and Google Cloud Storage.Documentation & FAQs ↓

Multi-Cloud Object Storage (S3 vs R2 vs B2) Egress Cost Calculator — Interactive Console

Runs locally in your browser • Instant output

Stored Data (TB / Month)

Data Egress / Outbound (TB / Month)

Class A Write Reqs (Thousands)

Class B Read Reqs (Thousands)

Cloudflare R2 $0 Egress Advantage

Save $6,307.80 / year vs AWS S3

Cloudflare R2 charges exactly $0.00 for outbound bandwidth egress, eliminating the "egress tax" on your application.

Monthly Cost Line-Item Breakdown

Prices in USD

Provider	Storage Cost	Egress Bandwidth	API Operations	Total Monthly
Cloudflare R2Best Value	$149.85	$0.00 (Free)	$0.00	$149.85
Backblaze B2	$60.00	$0.00 (Free)	$4.50	$64.50
AWS S3 Standard	$230.00	$441.00	$4.50	$675.50
Azure Blob (Hot)	$184.00	$435.00	$4.50	$623.50
Google Cloud Storage	$200.00	$600.00	$4.50	$804.50

Total Monthly Cost Comparison

Cloudflare R2$149.85 / mo

Backblaze B2$64.50 / mo

AWS S3 Standard$675.50 / mo

Azure Blob (Hot)$623.50 / mo

Google Cloud Storage$804.50 / mo

Step-by-Step Instructions

4 Steps to Completion

1Phase 1

Enter total stored data volume in Gigabytes or Terabytes (e.g., 20 TB).

2Phase 2

Input monthly outbound data transfer egress in TB (data downloaded by users or CDNs).

3Phase 3

Specify expected monthly Class A operations (PUT/COPY/POST/LIST) and Class B operations (GET/SELECT).

4Phase 4

Compare total monthly cost breakdowns side-by-side across AWS S3, Cloudflare R2, and Backblaze B2.

Practical Use Cases & Real-World Scenarios

Hosting Video Streaming & Media Downloads

Quantify the huge egress bill shock of serving 50TB of video downloads per month on AWS S3 ($4,500/mo) vs Cloudflare R2 ($0 egress).

Offsite Database & Disaster Recovery Backups

Determine whether Backblaze B2 ($6/TB/mo) or AWS S3 Glacier is more cost-effective for large cold enterprise backups.

Migrating SaaS Asset Storage

Calculate exact monthly operational cost changes before executing S3 API-compatible bucket migrations.

Cloud Object Storage & Egress Cost Calculator: AWS S3 vs Cloudflare R2 vs Backblaze B2

Monthly Cost Line-Item Breakdown

Total Monthly Cost Comparison

Step-by-Step Instructions

Practical Use Cases & Real-World Scenarios

Multi-Cloud Pricing Matrix

Zero-Egress Fee Modeling

Class A & Class B API Accounting

Annual Savings ROI Forecaster

Frequently Asked Questions

10 Best Cloud Storage Solutions in 2026

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