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SLA uptime calculator

Enter an uptime target and see exactly how much downtime it allows per day, week, month and year. The classic "how many nines" calculation.

99.9% allows about 8h 45m of downtime a year
  • Per day: 1m 26s
  • Per week: 10m 4s
  • Per month (30 days): 43m 12s
  • Per year (365 days): 8h 45m 36s

Downtime allowed is the time a service can be unavailable while still meeting the target. More nines means far less allowed downtime: 99.9% is about 8.8 hours a year, 99.99% about 52 minutes. Solves does not yet publish an uptime SLA; this tool is here to help you reason about targets.

Reading the nines

How much downtime each target allows

Uptime targets sound similar but behave very differently. The jump from 99.9% to 99.99% is the difference between roughly nine hours and under an hour of allowed downtime a year. That is why each extra nine costs disproportionately more to deliver.

For a small UK support team, the more useful commitment is often a clear response-time target rather than a very high uptime number. Solves SLA timers measure first response and resolution, with a breaching view that surfaces overdue tickets.

FAQ

About uptime targets

What does 99.9% uptime mean?

It means the service is allowed to be unavailable for no more than about 0.1% of the time, which is roughly 8.8 hours a year, 43 minutes a month or 1.4 minutes a day. Each extra nine cuts the allowed downtime by about ten times, so 99.99% allows only about 52 minutes a year.

Does Solves publish an uptime SLA?

Not yet. A formal uptime SLA is in preparation before public paid launch. This calculator is here to help you reason about uptime targets, whichever tool you use.

Set response targets that stick

Solves SLA timers track first response and resolution, with a breaching view that surfaces overdue tickets.