# SLA Uptime Calculator: How much downtime is 99.9%

Uptime is the amount of time that a service is online available and operational. Guaranteed uptime is expressed as SLA level and is generally the most important metric to measure the quality of a hosting provider. An SLA level of 99.99% for example equates to 52 minutes and 36 seconds of downtime per year.

The calculator below provides an easy way to calculate the downtime allowance as a time period based on a provided uptime percentage.

## SLA Uptime Calculator

Enter the SLA percentage to calculate it's allowed downtime

Daily | 9 seconds |
---|---|

Weekly | 1 minute |

Monthly | 4 minutes and 23 seconds |

Yearly | 52 minutes and 36 seconds |