A/B Testing Uptime Calculator Examples
Worked uptime comparison scenarios for A/B test variants, releases, and services.
These examples show how downtime and a shared monitoring period translate into uptime percentages, percentage-point differences, and annualized downtime estimates.
30-day release comparison
Both versions are monitored for 720 hours. Variant A has 18 minutes of downtime and Variant B has 7 minutes.
Input Summary
Monitoring period
720 hours
Variant A downtime
18 minutes
Variant B downtime
7 minutes
Calculation Breakdown
- 1Monitored minutes720 * 6043,200 minutes
- 2Variant A uptime((43,200 - 18) / 43,200) * 10099.958%
- 3Variant B uptime((43,200 - 7) / 43,200) * 10099.984%
- 4Uptime gap99.984 - 99.9580.025 percentage points
Result Summary
Uptime gap
0.025 percentage points
A/B Testing Uptime Calculator
Variant B records higher observed uptime and a lower annualized downtime rate.
Short canary monitoring period
Variant A has 2 minutes of downtime and Variant B has no recorded downtime in 168 monitored hours.
Input Summary
Monitoring period
168 hours
Variant A downtime
2 minutes
Variant B downtime
0 minutes
Calculation Breakdown
- 1Monitored minutes168 * 6010,080 minutes
- 2Variant A uptime((10,080 - 2) / 10,080) * 10099.980%
- 3Variant B uptime((10,080 - 0) / 10,080) * 100100.000%
- 4Annualized downtime for A(2 / 10,080) * 525,600104 minutes/year
Result Summary
Annualized downtime for A
104 minutes/year
A/B Testing Uptime Calculator
Variant B has perfect observed uptime during the week, while A has an estimated annualized rate of about 104 downtime minutes.
Equal uptime scenario
Each provider is monitored for 2,160 hours and records 30 minutes of downtime.
Input Summary
Monitoring period
2,160 hours
Variant A downtime
30 minutes
Variant B downtime
30 minutes
Calculation Breakdown
- 1Monitored minutes2,160 * 60129,600 minutes
- 2Variant A uptime((129,600 - 30) / 129,600) * 10099.977%
- 3Variant B uptime((129,600 - 30) / 129,600) * 10099.977%
- 4Uptime gap99.977 - 99.9770.000 percentage points
Result Summary
Uptime gap
0.000 percentage points
A/B Testing Uptime Calculator
The variants are tied on observed uptime for the shared period.
How to Read Your Results
Higher uptime means fewer unavailable minutes within the monitored period.
The uptime difference is expressed in percentage points, with positive values favoring Variant B.
Annualized downtime extends the observed downtime share across 365 days.
Compare only data collected under equivalent monitoring coverage and downtime rules.
Assumptions & Important Notes
- All examples use continuous monitoring over a shared period.
- Downtime is measured in whole service-unavailable minutes.
- Annual projections use 525,600 minutes per year.
- Results are estimates based only on the observed data.
Related Examples
Frequently Asked Questions
Is a 30-day uptime test enough to compare variants?
It can show observed differences, but longer and more representative periods generally give a more stable comparison.
What if both variants show 100% uptime?
They are tied on recorded downtime during that period. The result does not prove identical future reliability.
Should I compare annualized downtime from different monitoring periods?
You can compare normalized rates, but differences in monitoring quality, traffic conditions, or time windows can still affect interpretation.
Ready to calculate your own result?
Use the live calculator with your own inputs, timing, and preferences.