A/B Testing Service-Level Agreement (Annual) Calculator FAQ
Answers to common questions about annual A/B testing SLA targets, downtime allowances, availability calculations, and calculator results.
Use these answers to understand the inputs, outputs, assumptions, and practical limits of an annual A/B testing service-level agreement calculation.
General annual SLA questions
Basic concepts behind annual availability targets and downtime allowances.
What does an annual SLA target measure?
It states the minimum service availability expected over the defined annual measurement period.
What is an SLA downtime allowance?
It is the maximum amount of counted downtime implied by the target availability percentage.
Is availability the same as reliability?
Not exactly. Availability measures the share of time a service is available; reliability can include other performance concepts.
Does a 100% SLA allow downtime?
Under this calculation, a 100% target allows zero counted downtime.
Calculation questions
How the calculator converts inputs into results.
How are total service hours calculated?
The calculator multiplies the entered number of days by 24.
How is maximum allowed downtime calculated?
It multiplies total service hours by one minus the SLA target expressed as a decimal.
How is total counted downtime calculated?
It adds scheduled downtime and unplanned downtime entered into the calculator.
What is effective availability?
It is the percentage of total service hours remaining after subtracting total counted downtime.
What is availability variance?
It is effective availability minus the SLA target, shown in percentage points.
Inputs and interpretation
Guidance on entering downtime and understanding status results.
Should I enter maintenance downtime?
Enter it only if the relevant SLA says that maintenance counts as unavailable service.
What does positive downtime budget remaining mean?
It means recorded counted downtime is below the calculated annual allowance.
What does negative downtime budget remaining mean?
It means recorded counted downtime exceeds the calculated annual allowance.
Can I use 366 days?
Yes. Use 366 if the contract's measurement period is a leap year or otherwise covers 366 days.
Can downtime be entered in minutes?
Convert minutes to decimal hours before entering them. For example, 30 minutes is 0.5 hours.
Accuracy and agreement terms
Reasons a simple estimate may not match an official provider report.
Will this match a provider's official SLA report?
Not necessarily. Providers may use exclusions, different incident boundaries, rounding rules, or measurement windows.
Do excluded events affect the result?
They can. Excluded events generally should not be entered as counted downtime for this estimate.
Does meeting the calculated target prove contractual compliance?
No. Contract terms, exclusions, reporting rules, and remedies should be reviewed separately.
Does this calculate service credits?
No. It estimates availability and downtime allowance only; service-credit terms vary by agreement.
What does a 99.9% annual SLA allow for downtime?
Over 365 days, it allows 8.76 hours of counted downtime under this calculation.
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