A/B Testing Bandwidth Cost Calculator FAQ
Answers to common questions about annual A/B test bandwidth estimates, page weights, CDN pricing, traffic splits, and results.
This FAQ explains what the calculator estimates, which inputs matter, and why a planning estimate may differ from actual data-transfer charges.
General questions
What the calculator measures and what it does not include.
What does the A/B testing bandwidth cost calculator estimate?
It estimates annual page-delivery transfer and its cost for traffic included in an A/B test.
Does the calculator include the whole website's bandwidth?
No. It calculates only the share of page views included in the experiment.
Does it include experiment-platform fees?
No. Subscription fees, analytics events, API requests, and similar charges are outside this page-delivery calculation.
Inputs and traffic allocation
How visitor, page-view, and split inputs are used.
How do monthly visitors affect the result?
More visitors create more estimated page views, increasing test transfer in direct proportion when other inputs stay the same.
What is traffic included in test?
It is the percentage of site page-view traffic eligible to receive the control or variant experience.
Is variant traffic split based on all traffic?
No. It is the share of test traffic served the variant. The balance of test traffic receives control.
What should I enter for pages per visitor?
Use an average that reasonably represents page views on the pages where the experiment can appear.
Page weight and bandwidth
How transferred page sizes shape the estimate.
What page weight should I enter?
Use the average transferred page weight for each experience, including assets delivered per relevant page view.
Why can a heavier variant raise cost?
Each variant page view transfers more data than the control, increasing the weighted average transfer per test view.
Does a 50/50 test send both pages to every visitor?
No. Under this model, each test page view receives one experience, so the split determines the weighted average page weight.
Can the incremental cost be negative?
Yes. A lighter variant can make the mixed test delivery cost lower than the control-only baseline.
Accuracy and pricing
How to interpret the estimate against actual billing.
Why does the calculator use 1,000,000 KB per GB?
It uses decimal GB, a common convention for data-transfer pricing. Check how your provider presents usage and charges.
What CDN cost per GB should I use?
Use an effective or blended data-transfer rate appropriate for your expected traffic. The calculator does not model pricing tiers.
Will caching change actual bandwidth cost?
It can. Cache hits, compression, regional delivery, retries, and asset reuse can all affect actual transfer and billing.
Is this result a quote or invoice forecast?
No. It is an educational planning estimate based on the values entered.
How is annual A/B test bandwidth cost calculated?
The estimate combines control and variant page views, page weights, annualized transfer, and the entered CDN cost per GB.
Explore Related Questions
Ready to see what you can calculate?
Open the calculator and get personalized results in seconds.