Calculator Inputs
Enter billing values, downtime details, and contractual credit tiers. The result appears above this form after submission.
Example data table
This sample illustrates how outage minutes, exclusions, and credits can be documented for a monthly service review.
| Incident | Gross Downtime (min) | Excluded (min) | Billable (min) | Service Fee | Matched Credit % | Estimated Credit |
|---|---|---|---|---|---|---|
| Region outage | 42 | 5 | 37 | $2,500.00 | 10% | $250.00 |
| Control plane disruption | 180 | 20 | 160 | $2,500.00 | 25% | $625.00 |
| Severe monthly degradation | 2460 | 60 | 2400 | $2,500.00 | 50% | $1,250.00 |
Formula used
Total Minutes = Billing Days × 24 × 60
Billable Downtime = max(0, Gross Downtime − Excluded Downtime)
Actual Availability (%) = (1 − Billable Downtime ÷ Total Minutes) × 100
Allowed Downtime = Total Minutes × (100 − Committed Availability) ÷ 100
If Actual Availability is below a tier threshold, that credit percentage is triggered. The highest eligible credit tier becomes the matched credit.
Preliminary Credit = Monthly Fee × Credit %
Final Credit = min(Preliminary Credit, Monthly Fee × Credit Cap %)
How to use this calculator
- Enter the service name, billing month, and monthly service fee.
- Set the billing period length and the committed availability from your contract.
- Choose whether you want to calculate from downtime minutes or actual availability.
- Enter excluded downtime that your contract does not count toward credits.
- Select a preset or type your own three SLA credit tiers.
- Set the maximum credit cap if your agreement limits refunds.
- Submit the form to see the result above the calculator.
- Download the summary as CSV or PDF for claim records.
FAQs
1) What is an SLA credit?
An SLA credit is a contractual refund or service credit issued when a provider fails to meet promised uptime or service performance targets during a billing period.
2) Why do excluded minutes matter?
Many contracts remove planned maintenance, force majeure events, or customer-caused outages from calculations. Exclusions reduce billable downtime and can change the final credit amount.
3) Should I use downtime minutes or actual availability?
Use downtime minutes when you have incident records. Use actual availability when the provider reports a verified uptime percentage for the billing window.
4) What does the credit cap do?
Some agreements limit the maximum refund to a fixed percentage of the monthly fee. The cap prevents the credit from exceeding that contractual limit.
5) Can this calculator handle custom contracts?
Yes. You can edit all three tier thresholds, credit percentages, billing days, exclusions, and the maximum cap to reflect your own hosting agreement.
6) Why is the actual availability different after exclusions?
If exclusions apply, the calculator removes those minutes from gross downtime. That raises billable availability because only eligible downtime counts against the SLA.
7) Does a lower availability always mean a credit?
Not always. The actual result must fall below your defined tier thresholds, and some contracts also require claim submission within a strict notice period.
8) Is this result ready for a formal claim?
It is a strong calculation aid, but you should still verify contract wording, notice deadlines, incident evidence, and provider-specific credit rules before submitting a claim.