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Calculation Tools

SLA / Uptime Calculator

Use this calculator to estimate downtime budgets for common availability targets or translate outage windows back into SLA numbers.

The quick reference mode gives common nines values at a glance.

Mode Availability %

Downtime Value

Period

Inputs

Target availability (e.g. 99.9%, 99.99%)
Reporting period (day / week / month / quarter / year)

Outputs

Allowed downtime in seconds, minutes, hours, and days
Side-by-side comparison of common SLA targets

Use Cases

Negotiating SLA terms with customers or vendors
Sizing maintenance windows against committed availability
Quick reference during incident retrospectives

Limitations

Pure arithmetic — does not consider SLA exclusions or credit schemes