SLA Calculator

A 99.9% SLA allows approximately 43.8 minutes of downtime per month, or 8 hours 45 minutes per year. Each additional "nine" reduces allowed downtime dramatically: 99.99% (four nines) allows only 4.38 minutes per month, and 99.999% (five nines) allows just 26.3 seconds per month. Most SaaS companies target 99.9% to 99.95%.

An error budget is the maximum amount of downtime allowed before breaching your SLA. For a 99.9% SLA over one month, your error budget is 43.8 minutes. Every incident consumes part of this budget. When your error budget is exhausted, any additional downtime means you have breached your SLA and may owe service credits to customers.

This depends on your SLA agreement. Many SLAs exclude scheduled maintenance windows if customers are notified in advance (typically 48-72 hours). However, some agreements count all downtime regardless. Check your specific SLA terms. This calculator includes planned maintenance in the total downtime calculation for conservative reporting.

SLA breaches typically trigger service credits (5-30% of monthly bill), penalty payments, or in severe cases, contract termination rights. The specific consequences are defined in your service agreement. Beyond financial impact, SLA breaches damage customer trust and can increase churn significantly.

Dewx OPS Hub provides automated uptime monitoring, incident tracking, and real-time SLA compliance dashboards. It alerts you when error budget is running low, auto-generates incident reports, and provides trend analysis to prevent future breaches. Dew AI can predict potential SLA risks based on historical patterns.