SLA & Uptime Calculator
Convert SLA uptime percentages to allowed downtime per day, week, month, and year — or reverse from outage minutes.
About this tool
Translate uptime targets like 99.9%, 99.95%, and 99.99% into concrete downtime budgets for SRE error budgets, vendor contracts, and incident postmortems. Enter outage duration to see the implied uptime percentage.
What you get
- Allowed downtime per day, week, month, and year
- Uptime percentage from a custom outage duration
- Common SLA presets: 99.9, 99.95, 99.99, 99.999
- Bidirectional SLA ↔ downtime calculation
- Human-readable duration breakdown (minutes, hours, days)
- Live recalculation on input change
How to use
Pick an SLA preset or enter a custom percentage. Read the downtime table, or enter outage minutes to see the implied uptime.
Related searches
- sla calculator
- uptime calculator
FAQ
How much downtime is allowed at 99.9% uptime?
Pick the 99.9% preset to see allowed outage minutes per day, week, month, and year—your error budget for incidents.
How to convert SLA percentage to downtime minutes?
Enter a target uptime percentage and read the downtime table, or enter outage minutes to see the implied uptime.
What is the difference between 99.9 and 99.99 SLA?
Each extra nine shrinks allowed downtime roughly tenfold—99.99 permits far less monthly outage than 99.9.
How to calculate uptime from outage duration?
Enter how long a service was down in a period and the tool shows the resulting uptime percentage for contracts or postmortems.
How many minutes of downtime per month at 99.95% SLA?
Select or enter 99.95% and read the monthly allowed outage row—use it as an error budget when setting on-call and maintenance windows.
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