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Enter guaranteed uptime (SLA) in percent, e.g. 99.95
| Period | Days | Hours | Minutes | Seconds | Total (human-readable) |
|---|
Calculation: downtime = (1 - uptime/100) × period duration. A year is 365 days, a month is 30 days.
What it is
Uptime shows how long a system or service stays available. The tool converts availability percentage to real downtime and vice versa.
How it works
Enter a target availability (e.g., 99.9%) or a period length. The calculator instantly returns the expected downtime.
Examples
- 99.9% per month: ≈ 43 minutes of downtime.
- 99.99% per week: ≈ 1 minute.
- 43 minutes/month → availability: ≈ 99.9%.
Limitations & notes
Results are estimates. Actual downtime depends on maintenance windows, incidents and timezone. Use monitoring logs for audits.
FAQ
- What does 99.9% mean? A small allowance of downtime within the period (≈ 0.1%).
- Why do numbers differ? Month length and rounding vary.
- How to set SLO? Define SLO targets and track uptime with alerts.