Uptime / SLA Calculator
Enter your uptime percentage and see the allowable downtime for each time period.
Uptime Calculator converts availability percentage (99.9%, 99.99%, 99.999%) into hours/minutes of downtime per month and year. Critical for SLA planning: 99.9% = 8.7 h/year, 99.99% = 52 min/year.
What is Uptime SLA and How is Availability Calculated?
Uptime is the percentage of time a service is available and operational. SLA (Service Level Agreement) defines the guaranteed availability — for example, 99.9% uptime means no more than 8.76 hours of downtime per year. This calculator converts uptime percentage to maximum allowed downtime per day, week, month, and year, helping you evaluate SLA commitments and plan maintenance windows.
Related guides
Longer-form reading on this topic from the knowledge base.
Monitoring without surprises
Multi-region, 8 alert channels, public status page, API. Scout plan — free.