Uptime and SLA calculator
Turn an uptime percentage into allowed downtime per day, week, month and year, or turn real downtime into an uptime percentage to check against a host's SLA.
Allowed downtime per month
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Downtime allowed by common SLAs
| Uptime | Per day | Per week | Per month | Per year |
|---|---|---|---|---|
| 99% | 14.4 minutes | 1.7 hours | 7.3 hours | 3.7 days |
| 99.5% | 7.2 minutes | 50.4 minutes | 3.7 hours | 1.8 days |
| 99.9% | 1.4 minutes | 10.1 minutes | 43.8 minutes | 8.8 hours |
| 99.95% | 43.2 seconds | 5.0 minutes | 21.9 minutes | 4.4 hours |
| 99.99% | 8.6 seconds | 1.0 minutes | 4.4 minutes | 52.6 minutes |
| 99.999% | 0.9 seconds | 6.0 seconds | 26.3 seconds | 5.3 minutes |
A month is 30.44 days and a year 365.24 days. SLAs usually exclude scheduled maintenance; credits are paid only if you claim them.
Getting more uptime
Run on a provider with a data centre close to your users, serve static files from a global edge network, and put a firewall in front of the site to absorb bot and DDoS traffic.