A/B Testing File Size (Annual) Calculator

Estimate the annual data transfer, hosting cost and asset storage created by files used in your A/B tests.

Your Details

Monthly page visitors

Enter the average number of visitors to the page where test files are loaded each month.

A/B tests per year

Enter how many separate tests you expect to run during the year.

Average test duration

days

Enter the average number of days each test remains live.

Traffic allocated to test files

Enter the percentage of page visitors who receive a variation and download the test files.

Variants with test files

Enter the number of variations that need their own test assets, excluding any control that uses no added files.

Files per variant

Enter the average number of additional files downloaded for each test variation.

Average file size

Enter the average compressed file size for each added test asset in kilobytes.

Bandwidth cost per GB

Enter your estimated CDN or hosting charge per GB of transferred data in your preferred currency.

Overview

Use this A/B Testing File Size (Annual) Calculator to estimate the extra file requests, annual bandwidth and retained asset storage associated with experiment files. Add your visitor volume, testing schedule, traffic allocation, file count, average file size and hosting rate.

How it works

The calculator estimates the number of visitor sessions exposed to test files by combining monthly traffic, the number and duration of tests, and the traffic allocation. It multiplies those sessions by the number of files per variation and the average file size to estimate annual data transfer. The transfer estimate is then multiplied by your cost per GB. Storage is calculated separately from the number of tests, variations, files and file sizes retained.

How to use this calculator

1Enter the average monthly visitors to the tested page.
2Set the number of tests you expect to run and their typical duration.
3Enter the percentage of visitors assigned to variations with added files.
4Add the number and average size of files used by each variation.
5Enter your bandwidth price per GB and review the annual estimates.

Example Calculation

Monthly page visitors

50000

→

A/B tests per year

→

Average test duration

→

Traffic allocated to test files

50%

→

Variants with test files

→

Files per variant

→

Average file size

150

→

Bandwidth cost per GB

Annual test data transfer

124.27 GB

With these inputs, the test files create about 24.16 GB of additional annual transfer, costing about 2.17 at the entered rate, and require about 0.011 GB of retained asset storage.

Frequently asked questions

What does the A/B Testing File Size (Annual) Calculator estimate?

It estimates additional annual data transfer, a bandwidth cost based on your own rate, retained test-asset storage and extra file requests caused by A/B test files.

Does the number of variants increase annual data transfer?

Not necessarily. If the same share of visitors is allocated across more variants, total test traffic can stay the same. Variant count mainly affects the total files you need to store when each variant has separate assets.

Why is traffic allocation important?

Only visitors who receive a variation with the added files are counted. A smaller allocation generally reduces the extra bandwidth used by test assets.

What file sizes should I enter?

Use the average transferred size after compression and optimization, rather than the uncompressed design or source-file size. Include images, scripts, stylesheets or other files loaded specifically for the test.

Does this include normal page assets?

No. The calculation is intended for extra assets introduced by the test. Your normal site files and baseline page transfer are not included.

Can I use this for overlapping A/B tests?

Yes, but treat each overlapping test as a separate test entry in the annual count. Actual usage may be higher or lower if tests share assets or if visitors encounter several experiments.

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Assumptions and warnings

Assumptions

Monthly visitor volume is consistent throughout the year.
Each visitor assigned to a variation downloads every added file once per relevant test session.
Tests are treated as separate exposure periods; overlapping tests may increase actual downloads.
Data transfer is shown in decimal GB, where 1 GB equals 1,000,000 KB.
Storage assumes assets for all listed test variants are retained after each test ends.