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What does your uptime target allow?

Turn an availability percentage into a downtime budget for a real calendar month.

Allowed downtimeEnable JavaScript to calculate

Or use the formula below.

The formula

Allowed downtime = period duration × (1 − availability / 100)

For a 30-day month, 99.9% allows 43 minutes 12 seconds. At 99.99%, the same month allows 4 minutes 19.2 seconds. February has 28 or 29 days; a 31-day month has a larger duration budget. This calculator uses full UTC calendar months and rounds display values to the nearest millisecond.

A budget is not a guarantee

This is a duration-based calculation, not a contractual SLA assessment or a promise of Statance service availability. Contracts can define exclusions, planned maintenance, eligible requests, regional aggregation and credits differently. Request-based availability is a different calculation.

Periodic checks also cannot measure every instant between samples. Choose a check interval that fits your needs and distinguish observed uptime from guaranteed availability.

Understand check frequency and monitor website availability.

Monitoring decisions, explained.

Investigate a domain or IP address · Calculate a downtime budget
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