A/B Testing Hosting Cost (Monthly) Calculator
Estimate the monthly hosting and bandwidth cost of delivering an A/B test based on traffic, page usage, included bandwidth and overage pricing.
Overview
Use this A/B testing hosting cost calculator to estimate the monthly infrastructure cost of serving an experiment. Enter your monthly visitors, the share included in the test, expected pageviews, page size, bandwidth allowance, overage price and any fixed platform fee.
How it works
The calculator estimates the number of visitors assigned to the experiment by multiplying monthly site traffic by the test traffic percentage. It then multiplies those visitors by their expected tested pageviews and average page size to estimate monthly data transfer. Transfer is converted from MB to GB, compared with the included allowance, and any excess is charged at the entered overage rate. The fixed monthly platform or hosting fee is then added to the estimated overage charge.
How to use this calculator
- 1Enter your estimated monthly site visitors.
- 2Set the percentage of visitors expected to take part in the A/B test.
- 3Add the average number of tested pageviews per participant.
- 4Enter the average transferred size of the tested page.
- 5Add your included bandwidth, overage rate and fixed monthly fee.
- 6Review the estimated monthly cost and expected bandwidth usage.
Example Calculation
Monthly site visitors
100000
Traffic included in the test
50%
Pageviews per test visitor
3
Average tested page size
2
Included monthly bandwidth
100
Bandwidth overage rate
$0
Monthly testing or hosting fee
$49
Estimated monthly hosting cost
$66.37
With 50,000 test visitors generating three 2 MB pageviews each, estimated test transfer is about 292.97 GB. After a 100 GB allowance, the estimated monthly cost is about $66.37, including the $49 fixed fee.
Frequently asked questions
Does an A/B test double my hosting bandwidth?
Usually not. In a standard A/B test, each participant is assigned one version, so traffic is split between versions rather than duplicated for every visitor. Extra cost can still arise from larger pages, testing scripts or reduced caching.
What page size should I enter?
Use the average transferred size for the page being tested, including the assets that are normally loaded by a visitor. Your browser network tools, CDN dashboard or hosting analytics may help you estimate it.
Why is the test traffic percentage important?
It limits the estimate to visitors who are actually included in the experiment. A 25% allocation means approximately one quarter of your monthly visitors contribute to the calculated test traffic.
Does this include the cost of building the test?
No. This calculator estimates recurring hosting, platform and bandwidth costs only. It does not include design, engineering, analytics, quality assurance or staff time.
Can caching reduce A/B test hosting costs?
Yes. Effective browser, CDN and server caching can reduce the amount of data transferred and the origin work required. Actual savings depend on your implementation and provider configuration.
What costs may not be included in this estimate?
Depending on your setup, separate charges may apply for requests, CDN services, serverless execution, database activity, image optimization, analytics events and taxes.
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Assumptions and warnings
Assumptions
- Each participant receives one assigned variation rather than loading every variation.
- Average page size represents the data transferred per tested page load after normal caching behavior.
- The included bandwidth and overage rate apply only to the traffic being budgeted for the test.
- The estimate includes the stated fixed fee and bandwidth overages, but not development, analytics, support or transaction costs.
- Results are estimates because actual transfer size, caching, bot traffic and provider billing methods can differ.
Warnings
- This calculator provides a planning estimate only and does not replace your hosting provider's usage records or pricing terms.
- Check whether your provider measures bandwidth in GB or GiB and whether CDN, cache and bot traffic are billed separately.