SLA Downtime Calculator
Convert an availability target into an allowed outage duration for a supplied observation period.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Observation window (days) | Enter observation window in days; use the same basis as the other measurements. |
| Availability target (%) | Enter percentage units: 5 means 5%, not a fraction of 0.05. |
Understanding your result
Read Allowed downtime (s), Allowed downtime (min), Allowed downtime (h) in the units and model stated on this page. The formula seconds = window * 86400 * (1 - target / 100) · minutes = seconds / 60 · hours = seconds / 3600 defines the relationship; measurement accuracy and model applicability are separate from numerical precision.
Common mistakes
- Mixing input units or changing the physical meaning of a variable without changing the model.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Calculation checks, sources and review limits
How much downtime does this availability target allow?
Convert an availability target into an allowed outage duration for a supplied observation period.
Common uses
- How much downtime does this availability target allow
How it works
seconds = window * 86400 * (1 - target / 100); minutes = seconds / 60; hours = seconds / 3600
Worked example
Enter Observation window: 30 days; Availability target: 99.9 %. Results: Allowed downtime: 2592 s; Allowed downtime: 43.2 min; Allowed downtime: 0.72 h.