How is data transfer cost calculated?

First the volume is converted to GB (1 GB = 1000 MB). The free allowance is subtracted, and the remaining billable GB is multiplied by the price per GB. For example, 500 GB with a 100 GB free tier at 0.09 per GB costs (500 − 100) × 0.09 = 36.00.

Egress is outbound data leaving your cloud provider or CDN — for example, files downloaded by your users or responses sent from your API. Inbound data (ingress) is usually free; egress is the line item most providers charge for, which is what this tool estimates.

How accurate is the estimate?

It is accurate for a flat per-GB price, but many providers use tiered pricing, per-region rates and separate inbound/outbound charges. Use your provider's exact per-GB rate and free tier for the closest figure; the currency symbol is a label only and applies no exchange rate.

Does the free tier reset each month?

On most providers the free egress allowance resets at the start of each billing month, so enter the monthly free amount. The tool subtracts it once from the volume you enter, which represents a single month's transfer.

Why does the currency dropdown not change the number?

The currency selector only changes the symbol shown next to the result. No exchange rate is applied, so enter the price per GB in whatever currency your provider bills you in and the symbol simply labels the output.

Is my usage data sent anywhere?

No. The calculator is privacy-first and runs entirely in your browser — the figures you enter never leave your device.

What is the Data Transfer Cost Calculator?

Free data transfer cost calculator. Estimate cloud or CDN egress charges from your transfer volume, price per GB and free monthly allowance, in your chosen currency. Privacy-first — runs entirely in your browser. It runs free in your browser on Gera Tools, with nothing uploaded.

Data Transfer Cost Calculator

Name: Data Transfer Cost Calculator
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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Data Transfer Cost Calculator

Estimate what your data transfer (egress) will cost on a cloud host or CDN. It is for developers, ops teams and anyone sizing a hosting bill who needs a quick outbound-bandwidth figure before committing to a provider or scaling traffic up.

How it works

Providers bill outbound data per gigabyte and usually bundle a free monthly allowance, so the calculation is:

cost = (total GB − free GB) × price per GB

The tool first converts your volume to gigabytes using decimal units — MB ÷ 1000, GB ×1, TB ×1000 (1 GB = 1000 MB). It then subtracts the free allowance, clamps the billable amount at zero (so a volume under the free tier costs nothing), and multiplies the remaining billable GB by your price per GB. The currency selector is a display label only — no exchange rate is applied.

Example

500 GB of egress, a 100 GB free tier, at $0.09 per GB:

Total = 500 GB
Billable = 500 − 100 = 400 GB
Cost = 400 × 0.09 = $36.00

Input	Value
Volume	500 GB
Free allowance	100 GB
Billable	400 GB
Price per GB	$0.09
Cost	$36.00

Everything is calculated locally in your browser — nothing is sent anywhere.

Egress pricing by major provider

Cloud providers charge very different rates for outbound data transfer. The rates below are representative published list prices for general internet egress and vary by region, volume tier, and destination — always confirm with your provider before budgeting:

Provider	Approx. egress rate	Free tier
AWS (EC2/S3 to internet)	~$0.09/GB (first 10 TB)	100 GB/month (some products)
Google Cloud	~$0.08–$0.12/GB	1 GB/month
Azure	~$0.08–$0.087/GB	100 GB/month
Cloudflare (CDN)	$0 for bandwidth	Unlimited (CDN traffic)
Netlify	$0.20/GB over 100 GB	100 GB/month
Vercel	$0.15/GB over free tier	Varies by plan

The variation is substantial. Cloudflare’s CDN zero-egress model and similar offerings from BunnyCDN or Backblaze B2 (which waives egress fees to Cloudflare-connected origins) can dramatically reduce transfer costs for high-traffic static content compared to first-party cloud egress.

Tiered pricing and when it matters

Many providers reduce the per-GB rate at higher volumes. AWS, for example, charges a lower rate above 10 TB/month and lower still above 150 TB/month. If your estimate shows significant monthly egress, check whether your provider’s tier structure applies — the savings above certain thresholds can be meaningful.

This calculator uses a flat per-GB rate, which is accurate for providers with flat pricing or for estimating the first tier. If your volume spans multiple tiers, calculate each portion at its tier rate and sum them.

Ingress is usually free

Most cloud and CDN providers do not charge for inbound data (ingress). The cost is always on the outbound side: data leaving the cloud to the internet, or data transferring between regions or availability zones (inter-region transfer). If you are only uploading to cloud storage and users are not downloading yet, your egress cost is zero or near zero. The billing only begins when data flows outward toward your users.