A/B Testing Video Bitrate (Per-User) Calculator
Estimate per-user video data use and total delivery volume when testing two streaming bitrate variants.
Overview
This A/B testing video bitrate calculator estimates how much video data each user consumes under two bitrate variants. Enter the average bitrate, expected viewing time, test length, audience size, and traffic split to compare per-user usage with the total delivery volume for the experiment.
How it works
The calculator converts each bitrate from kilobits per second into data transferred over the expected watch time. It calculates a separate total for one user in each variant, then applies your traffic allocation to estimate how many users receive each version. The combined result is the expected video data delivered during the full test. Actual consumption can differ when adaptive bitrate streaming changes the delivered bitrate or viewing behavior varies.
How to use this calculator
- 1Enter the average delivered bitrate for Variant A and Variant B.
- 2Add the average minutes each participant is expected to watch per day.
- 3Set the number of days your A/B test will run.
- 4Enter the total participating audience and the share allocated to Variant B.
- 5Review per-user data use, the difference between variants, and total test delivery volume.
Example Calculation
Variant A bitrate
2500
Variant B bitrate
4000
Average watch time per user per day
20
Test duration
14
Participating users
10000
Traffic assigned to Variant B
50%
Variant B data per user
8.40 GB
With a 50/50 split, Variant A uses about 5.25 GB per user and Variant B uses about 8.40 GB per user over 14 days. The test delivers about 68,250 GB in total, with Variant B adding about 3.15 GB per assigned user.
Frequently asked questions
How is video data use per user calculated?
The calculator multiplies bitrate by total viewing seconds, converts bits to bytes, and expresses the result in decimal GB. It performs this calculation separately for each bitrate variant.
What does kbps mean for video bitrate?
Kbps means kilobits per second. A larger bitrate generally transfers more data for the same viewing time.
Why can actual streamed data differ from this estimate?
Adaptive bitrate streaming may deliver different quality levels as network conditions, device capabilities, content complexity, and player settings change.
Should I use encoded bitrate or delivered bitrate?
Use the best estimate of the average bitrate actually delivered to viewers. A nominal encoding bitrate may overstate or understate real delivery when adaptive streaming is used.
Does the traffic split affect per-user data use?
No. The bitrate and watch time determine data use for an individual user in a given variant. The traffic split affects the total test volume and blended average across all participants.
Are GB values based on 1000 or 1024 units?
This calculator uses decimal GB: 1 GB equals 1,000,000,000 bytes. This is commonly used for network transfer and CDN reporting.
Explore Related Calculators
Assumptions and warnings
Assumptions
- Bitrates are treated as sustained average delivery bitrates during viewing.
- Each participating user is assumed to watch the entered average duration on every test day.
- Data volumes are shown in decimal GB, where 1 GB equals 1,000,000,000 bytes.
- The traffic split is assumed to remain consistent throughout the test.
- The estimate covers video payload only and excludes player, advertising, analytics, retry, and network overhead.