Free tool

Uptime & SLA calculator

Enter an uptime target to see how much downtime it actually allows.

%

Allowed downtime at 99.9%

Per day1m 26s
Per week10m 5s
Per month43m 50s
Per year8h 45m

Based on a 365.25-day year. Downtime is the maximum your service can be unavailable while still meeting the target. Learn more in uptime percentages explained.