Uptime Percentage Calculator
Calculate uptime percentages and downtime
About Uptime Calculations
Uptime percentage measures the availability of a service or system. It's calculated as the percentage of time a system is operational during a given period.
Common Uptime Targets
- 99% (Two 9s): ~7.2 hours downtime/month
- 99.9% (Three 9s): ~43 minutes downtime/month
- 99.99% (Four 9s): ~4.3 minutes downtime/month
- 99.999% (Five 9s): ~26 seconds downtime/month