SLA Uptime & Downtime Calculator
Calculate the maximum allowed downtime for any uptime percentage. Essential for SLA planning, incident budgets, and reliability engineering.
Common SLA Targets
- 99% (2 nines): ~7.3 hours/month downtime
- 99.9% (3 nines): ~43 minutes/month downtime
- 99.95% (3.5 nines): ~22 minutes/month downtime
- 99.99% (4 nines): ~4.3 minutes/month downtime
- 99.999% (5 nines): ~26 seconds/month downtime
Use Cases
SLA negotiations, error budget planning, incident response planning, infrastructure reliability assessment, and DevOps metrics tracking.
About the “Nines”
The “nines” refer to the number of 9s in the uptime percentage. Each additional nine represents a 10x improvement in reliability and typically requires exponentially more investment to achieve.