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Uptime & SLA Downtime Calculator
See how many minutes of downtime per year/month an uptime rate such as 99.9% corresponds to.
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Daily downtime1 min 26 s
Weekly downtime10 min 5 s
Monthly (30 days) downtime43 min 12 s
Yearly (365 days) downtime8 h 45 min 36 s
Uptime percentages and yearly downtime
Uptime is the most important indicator of how reliable a service is. Small differences in percentage create big changes in yearly downtime:
- %99 — ~3.65 days downtime per year
- %99.9 ("three nines") — ~8.76 hours per year
- %99.99 ("four nines") — ~52.6 minutes per year
- %99.999 ("five nines") — ~5.26 minutes per year
Clou.TR hosting and server services offer a 99.9% uptime guarantee , and the system status can be transparently monitored from the live status page .
Frequently Asked Questions
Uptime is the percentage of time a server or service is reachable/operational over a given period. 100% means no downtime at all; the remaining portion is called downtime.
99.9% ('three nines') uptime allows about 8 hours 45 minutes of downtime per year. 99.99% means about 52 minutes per year, and 99.999% ('five nines') means only ~5 minutes of downtime per year.
An SLA (Service Level Agreement) is a document that contractually guarantees the uptime rate the provider commits to. If the provider fails to meet this rate, you are usually entitled to a service credit (refund). A high SLA guarantee is critical for enterprise projects.
In most SLA definitions, only the time the service is completely unreachable counts as downtime; degraded performance is evaluated separately. On the Clou.TR status page, the SLA calculation also considers only full outages.
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