SLA Uptime Calculator
Translate an uptime guarantee into the downtime you are actually allowed, per day, week, month and year.
Green = uptime • red = allowed downtime
Uptime Percentage
Allowed Downtime / Month
- Per Day
- 1m 26s
- Per Week
- 10m 4s
- Per Year
- 8h 45m 56s
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Understanding SLA Availability
SLA (Service Level Agreement) availability defines the guaranteed percentage of time a service will be operational. Meeting high availability standards (like "Five Nines" or 99.999%) requires redundant systems and rigorous network monitoring.
Common SLA Tiers
- 99.9% ("Three Nines"): Standard for commercial ISP services. Allows ~43 minutes of downtime per month.
- 99.99% ("Four Nines"): Enterprise standard. Allows ~4 minutes of downtime per month.
- 99.999% ("Five Nines"): Carrier/Telco grade. Allows only ~26 seconds of downtime per month.
Where this fits in running an ISP
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