A/B Testing File Size (Annual) Calculator FAQ
Answers to common questions about estimating A/B test file downloads, annual data transfer, bandwidth costs and storage.
This FAQ explains the inputs, outputs and assumptions used when estimating the infrastructure impact of files added to A/B test variations.
General calculator questions
Basic questions about the purpose and scope of the estimate.
What does the A/B Testing File Size (Annual) Calculator estimate?
It estimates extra annual file downloads, data transfer, a transfer cost based on your rate and retained test-asset storage.
Is this a total website bandwidth calculator?
No. It estimates only additional files introduced for A/B test variations, not baseline page traffic.
Who can use this calculator?
It can be used by teams planning experiment assets, CDN usage or hosting capacity.
Are the results exact?
No. Results are planning estimates based on the inputs and simplified download assumptions.
Inputs and calculation method
Questions about traffic, duration, variants and file-size entries.
Why is average test duration used?
It estimates the proportion of a year in which each test exposes visitors to added files.
What does traffic allocated to test files mean?
It is the percentage of page visitors who receive a variation that downloads the added assets.
Should I enter files used by every variation?
Enter the average additional files downloaded by a variation. Keep normal page assets out of this number.
Does adding variants always increase transfer?
Not if the total test allocation stays the same. Variants affect retained storage when each has separate assets.
Which GB conversion does the calculator use?
It uses decimal GB: 1 GB equals 1,000,000 KB.
Costs, storage and accuracy
Questions about interpreting the cost and storage outputs.
How is bandwidth cost estimated?
The annual data-transfer estimate is multiplied by the bandwidth cost per GB that you enter.
What is included in test asset storage?
It estimates the size of all files for every retained test variation and test during the year.
Why could actual bandwidth be lower?
Browser caching, CDN caching, repeated visitors, shared assets and fewer completed downloads can lower transfer.
Why could actual charges be higher?
A provider may apply request fees, regional pricing, minimum charges or charges not represented by a simple per-GB rate.
Should I use compressed or source-file sizes?
Use the compressed delivered size that visitors actually download.
Using the estimate for planning
Questions about practical scenario comparisons.
How can I reduce estimated test-file transfer?
Compare scenarios with smaller compressed files, fewer added files, shorter exposure periods or a lower traffic allocation.
Can I estimate overlapping experiments?
Yes, count each as a separate test when its added assets are independently loaded. Shared assets may require adjustment.
Can this estimate mobile and desktop assets separately?
Run separate estimates if those audiences receive materially different files, traffic shares or file sizes.
What should I do with a very small storage result?
It still represents retained test files, but transfer usually matters more than storage when the same assets are downloaded repeatedly.
What does the A/B Testing File Size (Annual) Calculator estimate?
It estimates extra annual file downloads, data transfer, a transfer cost based on your rate and retained test-asset storage.
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