SpeedDrain
Hosting Sizing · CDN Cache Modeling · Cloud Egress Forecasts

Website Bandwidth Calculator & Hosting Sizer

Accurately project monthly data transfer volumes in GB and TB. Model CDN edge cache offloading, peak hour bandwidth pipes, and estimated cloud egress bills.

Architecture & Traffic Presets:

Traffic & Page Size Inputs

75% cached at edge

Cloudflare or Fastly caches static images, fonts, and scripts. Origin only serves 25% of data.

Large File Downloads / Streaming (Optional)
Monthly Bandwidth Requirement
Total Monthly Data

329.6 GB

150,000 pageviews
Origin Server Egress

82.4 GB

after 75% CDN offload
Average Continuous Speed

1.04 Mbps

~0.13 MB/s 24/7
Peak Hour Throughput (~3.8x)

~3.96 Mbps

recommended pipe capacity

Estimated Monthly Cloud Provider Egress Costs

Based on 82.4 GB originating from your backend:

Cloudflare Edge CDN$0.00 / mo (Free Egress)
AWS EC2 / S3 (~$0.09/GB)$7.42 / mo
Google Cloud Platform (~$0.085/GB)$7.00 / mo
Standard VPS (Hetzner / DO)$0 (Included in 2-20 TB bundle)

Web Hosting Bandwidth, Cloud Egress & Caching Optimization

01.The Bandwidth Sizing Formula

To accurately estimate monthly hosting network bandwidth, calculate:

Total Monthly Bandwidth = (Monthly Visitors × Pages / Visitor × Avg Page Size) + Media Downloads

When an Edge Content Delivery Network (CDN) is positioned in front of your origin server, your origin server only bears the cost of cache misses:

Origin Bandwidth = Total Bandwidth × (1 - CDN Cache Hit Ratio)

Always add a 20% to 30% safety buffer to absorb search crawler indexing bots, marketing campaign spikes, and viral traffic surges.

02.Proven Strategies to Cut Bandwidth by 80%

High network transfer costs are usually caused by unoptimized static assets rather than application logic:

  • Modern Image Formats: Convert legacy JPEGs and PNGs to WebP or AVIF. This routinely cuts image byte weights by 40% to 70% with zero perceptible loss in visual fidelity.
  • Brotli Compression: Ensure web servers enable Brotli (br) compression for HTML, CSS, JavaScript, and JSON payloads. Brotli compresses text 15% to 25% better than Gzip.
  • Aggressive Cache Headers: Serve hashed static bundles with Cache-Control: public, max-age=31536000, immutable. Returning visitors will read assets entirely from local browser cache with zero bytes transferred.

03.Navigating the Cloud Egress Trap

Major hyperscale cloud providers (AWS, Google Cloud, Microsoft Azure) charge virtually nothing for inbound data ingress, but levy steep fees on outbound egress traffic:

  • AWS S3 & EC2: Averages ~$0.09 per GB transferred out to the internet after the initial 100 GB free tier. A 10 TB monthly site can accumulate over $800/month in pure bandwidth fees.
  • Cloudflare Zero-Egress: Cloudflare edge CDN does not bill for egress bandwidth on standard plans. By placing Cloudflare in front of your storage or hosting, edge-cached traffic costs $0.
  • Alternative Cloud Hosts: Providers like Hetzner and DigitalOcean bundle 2 TB to 20 TB of free monthly transfer with low-cost $5–$20 VPS plans.

04.Continuous Throughput vs 95th Percentile Billing

While total volume (GB/TB) measures consumption, enterprise colocation and unmetered dedicated servers bill using 95th Percentile Burst Throughput:

The hosting facility samples your port speed every 5 minutes throughout the month, sorts all samples from highest to lowest, and discards the top 5% of peak bursts. You are billed on the remaining 95th percentile rate.

If your traffic has massive unbuffered spikes (e.g. ticket sales or breaking news), your 95th percentile bill can be 4x higher than an evenly distributed load. CDNs smooth out these bursts before they hit your infrastructure.