A/B Testing File Size Per-User Calculator Examples
Explore practical A/B test data-size scenarios using participant counts, event volumes, event payload sizes, and compression assumptions.
These worked scenarios illustrate how event activity, payload size, compression, and participant count change an A/B test’s estimated data volume. Use them as planning references rather than exact storage forecasts.
Small product experiment with compact events
A product team expects 2,000 participants, 8 events per user, 0.75 KB per event, and 50% compression.
Input Summary
Participants
2,000
Variants
2
Average events per user
8
Average event size
0.75 KB
Compression reduction
50%
Calculation Breakdown
- 1Raw data per user8 * 0.75 KB6.00 KB
- 2Compressed data per user6.00 KB * (1 - 50 / 100)3.00 KB
- 3Total file size3.00 KB * 2,000 / 10245.86 MB
- 4Average per variant5.86 MB / 22.93 MB
Result Summary
Total file size
5.86 MB
A/B Testing File Size Per-User Calculator
The test produces an estimated 3.00 KB per user and 5.86 MB overall.
Standard 10,000-user A/B test
A team plans for 10,000 users, 12 events per user, 1.5 KB events, and 40% compression.
Input Summary
Participants
10,000
Variants
2
Average events per user
12
Average event size
1.5 KB
Compression reduction
40%
Calculation Breakdown
- 1Raw data per user12 * 1.5 KB18.00 KB
- 2Compressed data per user18.00 KB * 0.6010.80 KB
- 3Total file size10.80 KB * 10,000 / 1024105.47 MB
- 4Average per variant105.47 MB / 252.73 MB
Result Summary
Total file size
105.47 MB
A/B Testing File Size Per-User Calculator
The estimated compressed total is 105.47 MB, or 52.73 MB per variant.
Four-variant test with high event activity
A growth team expects 50,000 users across four variants, with 30 events per user, 2 KB events, and 30% compression.
Input Summary
Participants
50,000
Variants
4
Average events per user
30
Average event size
2 KB
Compression reduction
30%
Calculation Breakdown
- 1Raw data per user30 * 2 KB60.00 KB
- 2Compressed data per user60.00 KB * 0.7042.00 KB
- 3Total file size42.00 KB * 50,000 / 10242,050.78 MB
- 4Average per variant2,050.78 MB / 4512.70 MB
Result Summary
Total file size
2,050.78 MB
A/B Testing File Size Per-User Calculator
The test produces an estimated 42.00 KB per user and 2,050.78 MB in total.
How to Read Your Results
Compressed data per user estimates the event-data volume attributable to one participant after the selected reduction.
Total file size estimates all participant event records and is useful for rough storage, export, or transfer planning.
Average file size per variant assumes every variant receives the same share of participants.
Raw data per user shows the potential volume before compression and helps illustrate compression’s effect.
Treat MB results as estimates because actual files can include format-specific overhead and uneven event activity.
Assumptions & Important Notes
- Each scenario uses one average event count and one average event size for all participants.
- The reported compression reduction is applied uniformly to all event records.
- Participant allocation is even when calculating the average data volume per variant.
- Results use 1024 KB per MB.
Related Examples
Frequently Asked Questions
Why do two tests with the same participant count have different file sizes?
They can record different numbers of events, use different event payload sizes, or compress at different rates.
Can a four-variant test have the same total data as an A/B test?
Yes. If total participants and per-user event activity stay the same, variants mainly change how the total is divided.
What increases event payload size?
Additional properties, long strings, repeated metadata, identifiers, timestamps, and nested data can all increase an event record’s size.
How should I use the examples for planning?
Choose the scenario closest to your expected traffic and tracking design, then replace its assumptions with measured values where possible.
Ready to calculate your own result?
Use the live calculator with your own inputs, timing, and preferences.