Uptime Calculator
Calculate uptime percentage and SLA nines level from total hours and downtime hours. Determine whether your system meets two, three, four, or five nines.
How to Use the Uptime Calculator
- Enter the total monitoring period in hours.
- Enter the total downtime in hours.
- Click Calculate to get uptime percentage and nines level.
Cas d'utilisation
- •Reporting monthly uptime to clients and stakeholders.
- •Checking SLA compliance after an incident.
- •Tracking infrastructure reliability over time.
- •Comparing uptime across different services.
Formule
Uptime % = (Total hours − Downtime hours) / Total hours × 100. Nines: 99%=2, 99.9%=3, 99.99%=4, 99.999%=5.
Questions fréquemment posées
What are nines in uptime?
Nines refer to the number of 9s in the uptime percentage: 99.9% = three nines, 99.99% = four nines, etc.
How do I calculate uptime from logs?
Sum total operational hours, subtract downtime hours, then divide by total hours and multiply by 100.
What uptime does AWS guarantee?
AWS EC2 guarantees 99.99% (four nines) monthly uptime for multiple instances across availability zones.