Uptime SLA Calculator
Allowed downtime for each SLA level.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Allowed per month
- 21.9 min
- Allowed per year
- 4.38 hours
- Allowed per day
- 0.72 min
- SLA status
- SLA breached
Quick answer
An uptime SLA sets the maximum downtime allowed over a period.
Downtime = period × (1 − uptime %)
How to use the Uptime SLA Calculator
- 1Enter your uptime target percentage.
- 2Enter actual downtime recorded.
- 3Compare against the monthly allowance.
Frequently asked questions
What is three nines?
99.9% uptime, about 43 minutes downtime per month.
Does planned maintenance count?
Usually excluded if the SLA defines a maintenance window.