Uptime is the amount of time that a service is available and operational. Uptime is generally the most important metric for a website, online service or web based provider and is expressed as a percentage such as '99.9%'. For example a 99.9% uptime equates to 43 minutes and 50 seconds of downtime.
The below calculator provides an easy way to calculate the downtime allowance as a time period based on a provided uptime percentage.
Enter an SLA percentage to calculate it's downtime allowance.
An advertised SLA uptime of 99.9% gives the following possible periods of downtime:
| Daily | 1 minutes 26 seconds |
| Weekly | 10 minutes 5 seconds |
| Monthly | 43 minutes 12 seconds |
| Yearly | 8 hours 45 minutes 36 seconds |