Free tool
SLA uptime and downtime calculator
Availability calculator - SLA & Downtime calculator
What is uptime?
Uptime is the amount of time that a service is available and operational, typically expressed in percentage.
What is SLA?
A service-level agreement (SLA) defines the level of service you expect from a vendor, laying out the metrics by which service is measured, as well as remedies or penalties should agreed-on service levels not be achieved.
How to prevent downtime?
Redundancy, monitoring and alerting are key to ensure a safe and reliable service.
Percentiles matter.
99.9% uptime equals to a period of downtime of 1 minute and 26 seconds per day.
99.99% uptime equals to a period of downtime of less than 9 seconds per day.
99.999% uptime equals to a period of downtime of less than 1 second per day.
SLA UPTIME AND DOWNTIME CALCULATOR
What is the uptime percentage?
Daily9s
Weekly1m
Monthly4m 19s
Quarterly17m 17s
Yearly52m 34s
SLA Guide
SLA calculation cheatsheet
Availability calculation
Availability (%) = (Total Time - Downtime) / Total Time × 100Example: If a service was down for 7.3 hours in a 30-day month:
- Total Time = 30 days × 24 hours = 720 hours
- Availability = (720 - 7.3) / 720 × 100 = 98.99%
Common availability targets
→99.9% ("three nines"): 8.76 hours downtime/year (43.8 minutes/month)
→99.95%: 4.38 hours downtime/year (21.9 minutes/month)
→99.99% ("four nines"): 52.56 minutes downtime/year (4.38 minutes/month)
→99.999% ("five nines"): 5.26 minutes downtime/year (26.3 seconds/month)
Response time SLA
Response Time Compliance (%) = (Responses Within Threshold / Total Responses) × 100Mean time metrics
→MTBF (Mean Time Between Failures) = Total Operational Time / Number of Failures
→MTTR (Mean Time To Repair) = Total Repair Time / Number of Repairs
→MTTA (Mean Time To Acknowledge) = Total Time to Acknowledge / Number of Incidents
Service credit calculation
Service Credit = (Monthly Service Fee) × (Credit Percentage for SLA Breach)SLA penalty example
- If availability drops below 99.9% but remains above 99.0%: 10% credit
- If availability drops below 99.0%: 25% credit
Monitoring
Track SLAs and downtime metrics at a glance
Hyperping's reporting dashboard brings all your critical monitoring metrics into one powerful command center, giving you complete visibility into your system's reliability.
With the unified monitor overview, you can instantly see how all your monitors are performing without jumping between different screens or reports. This bird's-eye view helps you spot patterns and problems immediately.
Need to prove your reliability to stakeholders? The SLA tracking feature gives you clear, easy-to-read statistics on your service level agreements. No more scrambling to compile numbers for quarterly reviews.
The dashboard also includes detailed MTTR analytics, helping you measure and improve your Mean Time to Recovery. By understanding how quickly you're resolving incidents, you can identify bottlenecks in your response processes.
Want to analyze past performance? Browse through your complete incident timeline with powerful filtering options in the comprehensive outage history section. And when you need to share this data with others, simply download your metrics in CSV format for custom analysis and reporting.
The powerful filtering and analysis tools let you track trends with intuitive visualizations and export filtered data for deeper analysis in your preferred tools.
Resources
SLA & uptime management guides
Incident Management in 2025: Best Practices, Tools Guide & More - In this guide, we'll walk through everything you need to know about incident management, from basic concepts to advanced strategies used by top DevOps teams.
Understanding SLAs, SLOs, and SLIs - SLAs, SLOs, and SLIs are crucial for managing tech services, ensuring reliability and trust. Learn how these elements work together to maintain service quality and user satisfaction.
MTTR guide: how to improve system reliability & response time - Meantime to repair (MTTR) directly impacts your customer trust and company reputation. This guide provides actionable steps to boost your system reliability and keep customers happy.
