UPTIME MONITORING GUIDE
Uptime Percentage Explained
Uptime percentage is the share of successful checks during a measurement window. The number is useful only when you also understand the window, check frequency, and what counts as success.
Reading the number
At 99.9% monthly uptime, roughly 43 minutes of downtime can occur in a 30-day month. At 99%, the allowance is more than seven hours.
Measurement windows matter
A daily, weekly, and monthly percentage can tell different stories. Short windows highlight current incidents; longer windows show reliability trends.
Checks are samples
A monitor observes service at intervals. A ten-minute check can miss a short outage between requests, while one-minute checks provide a more detailed external record.
Key takeaways
- ✓Always state the measurement window.
- ✓Use shorter intervals for critical services.
- ✓Pair percentages with incident duration and impact.
Continue learning
What Is Uptime Monitoring?
Learn how uptime monitoring works, what external checks can detect, and how to choose useful website and API monitors.
How to Monitor Website Uptime
A practical guide to choosing website URLs, check intervals, alerts, and response procedures for uptime monitoring.
Website Downtime Alerts: A Practical Setup Guide
Configure useful website downtime and recovery alerts while reducing noise from brief network failures.
Put the guide into practice
Monitor three websites or APIs free with PingGuard.
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