A/B Testing Service-Level Agreement (Monthly) Calculator
Calculate monthly availability, permitted downtime, excess outage time and potential service credits for an A/B testing platform SLA.
Overview
Use this monthly A/B testing SLA calculator to compare reported outage time with an availability target, account for excluded maintenance, and estimate a possible service credit. Enter the billing-period length, downtime records, relevant monthly fee, and the credit terms in your agreement.
How it works
The calculator converts the billing month into total minutes and subtracts SLA-excluded maintenance from reported downtime. It then divides remaining available minutes by total monthly minutes to calculate actual availability. The SLA allowance is the downtime implied by the target availability. Any chargeable downtime above that allowance is converted to hours, multiplied by the entered credit per excess hour, and limited by the monthly credit cap.
How to use this calculator
- 1Enter the number of days in the billing month.
- 2Add the availability target stated in the SLA.
- 3Enter total reported downtime and any approved excluded maintenance.
- 4Enter the eligible monthly service fee and service-credit terms.
- 5Review actual availability, excess downtime, and the estimated capped credit.
Example Calculation
Days in billing month
30
SLA availability target
100%
Reported downtime
60
Excluded maintenance time
0
Monthly service fee
$1,000
Credit per excess downtime hour
$100
Maximum monthly credit cap
25%
Actual monthly availability
99.861%
For a 30-day month, a 99.9% SLA permits 43.2 minutes of downtime. With 60 chargeable outage minutes, availability is about 99.861%, excess downtime is 16.8 minutes, and the estimated credit is $28.00 before any contract-specific rounding rules.
Frequently asked questions
What is monthly SLA availability?
Monthly SLA availability is the percentage of minutes in a billing month when the service is available, after applying any exclusions defined in the agreement.
How much downtime does a 99.9% monthly SLA allow?
For a 30-day month, 99.9% availability allows 43.2 minutes of chargeable downtime. The allowance changes with the number of days in the billing period.
Should planned maintenance count as downtime?
It depends on the SLA. Enter only maintenance time that the agreement explicitly excludes from availability calculations.
Why might the calculated credit differ from a provider's credit?
Contracts may apply outage tiers, rounding, claim windows, eligibility limits, multiple exclusions, or credits based on a different fee amount.
Does an SLA breach automatically mean a service credit is due?
Not always. Many agreements require a timely claim and may limit credits to defined incidents, services, or customer charges.
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Assumptions and warnings
Assumptions
- Availability is calculated over every minute in the stated billing month.
- Only the entered excluded maintenance time is removed from reported downtime.
- The service-credit amount is calculated from the entered rate per excess downtime hour and is capped at the entered maximum monthly credit rate.
- This is a planning estimate; actual SLA terms may use outage tiers, aggregation rules, claim deadlines, or different definitions of unavailability.
Warnings
- This calculator provides an estimate only and does not determine contractual entitlement to a service credit.
- Review the signed SLA, incident records, exclusions, and service-credit claim process before relying on the result.