API Response Size Transfer Calculator

If you know your request volume and typical response size, you can estimate transfer and then model egress/CDN cost.

Inputs

Requests (per day)
Average response size (KB)
Use your typical compressed payload size over the wire.

Results

Requests per month (est.)
60,800,000
Monthly transfer (est.)
870 GB

Example scenario

  • 2,000,000 requests/day with 15 KB average responses ≈ ~870 GB/month (estimate).

Included

  • Monthly transfer estimate from requests/day and average response KB.
  • Useful for quick egress/CDN planning and cost comparisons.

Not included

  • Protocol overhead, retries, uploads, and request headers.
  • Compression differences between endpoints (model with your average KB).

How we calculate

  • Requests per month ≈ requests/day × 30.4.
  • Monthly transfer (GB) ≈ requests/month × average response KB ÷ 1024 ÷ 1024.
  • This estimate ignores protocol overhead and retries.

FAQ

Should I use compressed or uncompressed size?
Use the typical size over the wire (compressed) to better estimate bandwidth.
Does this include uploads?
No. This models response payloads. If uploads are significant, model them separately.

Related tools

Egress cost CDN bandwidth cost RPS to monthly requests

Disclaimer

Educational use only. Not legal, financial, or professional advice. Results are estimates based on the inputs and assumptions shown on this page. Verify pricing and limits with your providers and documentation.

Last updated: 2026-01-06