SLA & Uptime Calculator
Convert SLA percentages to allowed downtime per day, month, or year.
About this tool
Translate uptime targets (99.9%, 99.95%, 99.99%) into concrete downtime budgets. Useful for SRE error budgets, contracts, and incident postmortems.
What you get
- Allowed downtime per day, week, month, and year
- Uptime percentage from a downtime duration
- Common SLA presets (99.9 / 99.95 / 99.99 / 99.999)
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.
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.
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