What Is a Data Egress Cost Calculator?
Cloud providers (AWS, Google Cloud, Azure, and others) typically charge for data leaving their network — known as data egress. While storage and inbound transfer are often cheap or free, egress is metered per gigabyte and can become a significant line item. This calculator converts the volume of data you transfer out, expressed in terabytes, into a total dollar cost using your provider's per-GB rate.
How to Use It
Enter the amount of data egressed in terabytes (TB) and your price per GB in dollars. The tool multiplies your TB by 1,024 to get gigabytes (using the binary convention many cloud bills follow), then multiplies by the per-GB price to give your total egress cost.
The Formula Explained
The calculation is simply $$\text{cost} = \text{egress\_tb} \times 1024 \times \text{price\_per\_gb}$$ The factor 1,024 converts terabytes to gigabytes. For example, 10 TB equals 10,240 GB. If you prefer the decimal (SI) convention where \(1\ \text{TB} = 1000\ \text{GB}\), divide the result accordingly, but most cloud egress meters bill in binary GiB rounded to GB.
Worked Example
Suppose you transfer 10 TB out of your cloud bucket at a price of $0.09 per GB. First convert: \(10 \times 1024 = 10240\ \text{GB}\). Then multiply: $$10240 \times \$0.09 = \$921.60$$ That is your estimated egress charge before any free-tier allowances or volume discounts.
FAQ
Does this include the free tier? No. Many providers give a small monthly free egress allowance (e.g., 100 GB). Subtract that from your total before entering, or treat this as a gross estimate.
Why multiply by 1024 and not 1000? Cloud billing commonly uses binary gibibytes for storage and transfer. If your provider quotes decimal terabytes, use 1000 instead.
Are inter-region or CDN transfers included? Pricing varies by destination (internet, another region, a CDN). Use the per-GB rate that matches your specific transfer path for the most accurate estimate.
