Observed Uptime Calculator
Observed uptime equals monitored time minus downtime, divided by monitored time, multiplied by 100. Use downtime measured within the same monitoring window.
Formula & method
Uptime (%) = (monitored minutes − downtime minutes) ÷ monitored minutes × 100.Worked example
| Input | Value |
|---|---|
| Total monitoring window | 1,440 min |
| Downtime inside that window | 15 min |
| Result | Value |
|---|---|
| Observed availability | 98.95833333 % |
| Available time | 1,425 min |
Compare scenarios
The first input changes while the other example inputs stay fixed. These are arithmetic scenarios, not forecasts.
| Compare scenarios | Total monitoring window min | Observed availability | Available time |
|---|---|---|---|
| −20% | 1,152 | 98.69791667 % | 1,137 min |
| Example | 1,440 | 98.95833333 % | 1,425 min |
| +20% | 1,728 | 99.13194444 % | 1,713 min |
Assumptions & limits
Sum overlapping outages only once for the same service. Monitoring gaps, probe locations and the definition of an outage affect the inputs. Request-based availability can differ from this time-based percentage.
Displayed results are rounded. Calculations use unrounded JavaScript numbers; small floating-point differences are possible.
Works in your browser
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Sources & definitions
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