SLA Breach Calculator

Calculate the impact of downtime incidents against your SLA target. Enter the start and end time of an outage and your SLA percentage to see if a breach occurred—and how much availability you lost.

This tool is built for SREs, engineers, and ops teams who need quick visibility into SLA compliance. Whether you’re reporting to leadership or validating uptime claims, it gives you an objective read on whether an incident put you over the line.

FAQ: SLA Breaches & Incident Impact

1) How do I know if a specific incident breached our SLA?
You need two things: the exact duration of the outage, and the total SLA window (usually a month). Compare your actual uptime to the SLA target. This calculator handles that for you, just plug in the incident start/end time and your SLA threshold.

2) What availability percentage equals a breach at 99.9% SLA?
At 99.9%, you’re allowed roughly 43 minutes of downtime per 30 days. Anything beyond that, whether in a single incident or accumulated across the period, puts you below the SLA line. The calculator uses this 30-day baseline to determine breach status.

3) Should I track each incident separately or aggregate them?
You should do both. Track individual outages for root cause and impact analysis, and also track cumulative downtime across your SLA window. Even short incidents can stack up to a breach. Dotcom-Monitor helps by logging and alerting on every failure point, not just major ones.

4) Do I need external monitoring to validate SLA compliance?
Yes, you absolutely do. Internal monitoring often misses regional outages, DNS failures, or edge cases users experience. For SLA enforcement and defensibility, external monitoring like Dotcom-Monitor provides independent availability data.

5) Can we exclude certain downtime from SLA calculations?
Only if it’s explicitly defined in your SLA (maintenance windows, force majeure, etc.). Otherwise, all downtime counts. Be careful here, because some providers quietly exclude “non-user-facing” outages. External measurement makes those gaps visible with tools like Dotcom-Monitor.