Uptime SLA Calculator
1. Enter SLA Target
Load Sample
2. Allowed Downtime Breakdown
Daily Allowed Downtime–
Weekly Allowed Downtime–
Monthly Allowed Downtime–
Yearly Allowed Downtime–
How to Use the Uptime SLA Calculator
- Enter your guaranteed SLA percentage (e.g., 99.9%).
- Select the time period (Daily, Weekly, Monthly, Yearly).
- Click Calculate to view the maximum allowed downtime.
Formulas and Technical Logic
Downtime is calculated using the formula: Downtime = Total Time × (1 – (SLA Percentage / 100)). For example, a 99.9% SLA in a 30-day month (43,200 minutes) equals 43,200 × 0.001 = 43.2 minutes of allowed downtime.
Key Features
- Supports decimal percentages up to 5 nines (99.999%).
- Instant translation to days, hours, minutes, and seconds.
- Reverse calculation (downtime to SLA).
- Works for standard and leap years.
Reference Table: Standard SLAs
| Availability | Monthly Downtime | Yearly Downtime |
|---|---|---|
| 99% (Two Nines) | 7 hours, 18 minutes | 3 days, 15 hours |
| 99.9% (Three Nines) | 43 minutes, 49 seconds | 8 hours, 45 minutes |
| 99.99% (Four Nines) | 4 minutes, 23 seconds | 52 minutes, 35 seconds |
| 99.999% (Five Nines) | 26 seconds | 5 minutes, 15 seconds |
Frequently Asked Questions
What is an SLA?
A Service Level Agreement (SLA) is a contract that dictates the expected availability and performance of a service.
Why is 100% uptime unrealistic?
Hardware fails, software requires patching, and network outages occur. Achieving 100% is practically impossible; five nines (99.999%) is the industry gold standard.