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SLA Downtime Credit Calculator

Calculate SLA-allowed downtime, actual downtime, excess downtime, and the estimated service credit owed.

The uptime percentage guaranteed by your SLA (e.g., 99.9% = three nines).
Hours in the billing period (720 = 30-day month, 744 = 31-day month).
The actual uptime you experienced during the billing period.
Your total invoice for the billing period.

Results

SLA Allowed Downtime0.72 hrs
Actual Downtime3.60 hrs
Excess Downtime2.88 hrs
Estimated Credit$40.00

📖What is it?

For informational/educational purposes only. Cloud providers offer SLAs guaranteeing a minimum uptime percentage. When actual uptime falls below the SLA, customers are typically entitled to service credits. This calculator estimates that credit.

🎯How to use

Enter your SLA uptime percentage, billing period hours, actual uptime experienced, and monthly bill. The calculator computes allowed vs. actual downtime, excess downtime, and the credit amount based on a 10x penalty rate (i.e., 0.1% downtime = 1% credit).

💡Example scenario

SLA: 99.9% uptime over 720 hrs. Allowed downtime: 0.72 hrs. Actual uptime: 99.5% = 3.6 hrs downtime. Excess: 2.88 hrs. Credit % = 2.88/720 � 1000 = 4%. On a $1,000 bill, credit = $40.

🏆Pro tip

Always read the exact credit tiers in your SLA. AWS, Azure, and GCP have different credit percentages per tier (e.g., 25%, 50%, 100%). Some SLAs require you to proactively submit a credit request within a deadline after the incident.