What is the Cloud Data Transfer / Egress Cost Calculator?
Most cloud providers (AWS, Google Cloud, Azure, and others) charge for data leaving their network — known as egress or data transfer out. Inbound data is usually free, but outbound traffic to the internet is billed per gigabyte after a small monthly free tier. This calculator estimates that cost so you can budget and avoid surprise bills.
How to use it
Enter three values: the total GB transferred out during the billing period, your provider's free tier allowance in GB, and the price per GB for your region and tier. The calculator subtracts the free allowance, applies the price to the remaining billable gigabytes, and shows your estimated cost. Prices vary by provider, region, and volume tier — check your provider's pricing page for the exact rate.
The formula explained
The cost is simply $$\text{Cost} = \max\left(0,\; \text{Transferred (GB)} - \text{Free Tier (GB)}\right) \times \text{Price per GB}$$ The \(\max(0, \ldots)\) ensures that if you stay within the free tier, your billable amount is zero rather than negative. Only the gigabytes above the free allowance are multiplied by the per-GB price.
Worked example
Suppose you transfer 1,000 GB out, your free tier is 100 GB, and the price is $0.09/GB. Billable data is \(1{,}000 - 100 = 900\) GB. Cost = $$900 \times \$0.09 = \$81.00$$
FAQ
Does ingress (data in) cost money? Generally no — most providers do not charge for inbound traffic, only for egress to the internet.
Why is my real bill different? Real pricing is tiered (the rate drops at higher volumes), varies by destination region, and may include CDN or inter-region charges. This tool uses a single flat rate for a quick estimate.
What is a typical price per GB? Internet egress commonly ranges from about $0.05 to $0.12 per GB for the first tier, but always verify with your provider.
