SLA Uptime & Downtime Calculator
Convert SLA uptime percentages (99.9%, 99.99%, 99.999%) to allowable downtime per day, week, month, and year.
Calculating Service Level Agreement (SLA) Downtime Limits
Service Level Agreements (SLAs) define guaranteed network availability. High-availability enterprise fiber circuits mandate 99.9% ('three nines') to 99.999% ('five nines') uptime.
Exceeding allowable downtime triggers SLA penalty credits, contract breaches, and customer churn. ISPs use SLA metrics to set emergency dispatch escalation rules.
Interactive SLA Uptime & Downtime Calculator Workspace
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Convert SLA uptime percentages (99.9%) to allowable downtime limits.
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SLA Uptime Calculator
Real-World Calculation Walkthrough
Enterprise Dedicated Internet Access (DIA) circuit with 99.9% uptime SLA
Input Parameters
Calculation Output
SLA Uptime & Downtime Calculator Engineering FAQs
What is the difference between 99.9% and 99.99% uptime SLA?
99.9% uptime allows 8.76 hours of annual downtime, while 99.99% ('four nines') allows only 52.6 minutes of downtime per year.
Do planned maintenance windows count against SLA uptime limits?
Standard enterprise contracts exclude scheduled maintenance windows (e.g., Sunday 02:00-04:00 AM) if advance notice of 48-72 hours is provided.
How do ISPs calculate SLA penalty credits?
SLA penalties typically refund 5% to 10% of monthly recurring charges (MRC) for every hour of downtime exceeding contract limits.
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