Availability

Uptime and SLA calculator.

Turn an availability percentage into the maximum downtime it theoretically allows so it is easier to understand what an SLA really means in a day, week, month or year.

Uptime Downtime Clear comparison
43 min

Approximate downtime allowed by a 99.9% SLA during 30 days.

99 · 99.5 · 99.9 · 99.95 · 99.99 · 99.999

Frequent percentages for comparing hosting, cloud services and infrastructure.

Inputs

Define your SLA

Estimated result

43 min

A 99.9% SLA allows approximately 43 min of downtime in 30 days.

Allowed downtime 43.2 min
Downtime percentage 0.100%

Key idea

The gap between 99.9% and 99.99% looks small, but it changes total allowed downtime a lot.

Useful for comparisons

Helpful for hosting, SaaS, cloud services or infrastructure with availability promises.

Makes SLA tangible

Instead of looking only at percentages, you can see how much downtime they imply in practice.

Directional result

The tool translates percentage into maximum theoretical downtime, not into real observed incidents.