1. What is the SLA Calculation Formula?

The SLA (Service Level Agreement) calculation measures the percentage of time a service is available during a specific period. It's a key metric for assessing service reliability and performance.

2. How Does the Calculator Work?

The calculator uses the SLA equation:

Where:

• \( Total \) — Total time period in hours
• \( Downtime \) — Time the service was unavailable in hours

Explanation: The equation calculates the percentage of time the service was available by subtracting downtime from total time, dividing by total time, and multiplying by 100.

3. Importance of SLA Calculation

Details: SLA is crucial for service providers and customers to measure and agree on expected service availability. It's often used in IT services, cloud computing, and telecommunications.

4. Using the Calculator

Tips: Enter total time period in hours and downtime in hours. Downtime cannot exceed total time. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is considered a good SLA percentage?
A: Typically 99.9% ("three nines") or higher is considered good, depending on the service criticality. 99.99% ("four nines") is excellent.

Q2: How does SLA differ from uptime?
A: SLA is a contractual agreement with specific terms, while uptime is a general measurement of system availability.

Q3: Should planned maintenance be included in downtime?
A: It depends on the agreement. Some SLAs exclude planned maintenance windows from downtime calculations.

Q4: What's the difference between SLA and SLO?
A: SLA is a formal agreement with consequences, while SLO (Service Level Objective) is an internal target without contractual obligations.

Q5: How often should SLA be measured?
A: Typically measured monthly, but can be quarterly or annually depending on the agreement terms.