Uptime SLA Calculator
Allowed downtime for each SLA level.
Enter your values
ⓘ Live results
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.
Worked example
Using the values the calculator loads with:
Inputs
- Uptime target99.95 %
- Actual downtime this month35 min
Results
- Allowed per month21.9 min
- Allowed per year4.38 hours
- Allowed per day0.72 min
- SLA statusSLA breached
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.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.