Uptime Calculator
Calculate the maximum allowed downtime for any SLA percentage — per year, month, week and day.
Quick Reference
Common SLA tiers| SLA | Name | Per Year | Per Month | Per Week | Per Day |
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What is SLA?
Service Level Agreement defines the guaranteed uptime percentage for a service over a period.
Nines
"Five nines" (99.999%) allows only ~5.26 minutes of downtime per year — the gold standard for critical infrastructure.
Planned maintenance
Maintenance windows count against your SLA unless explicitly excluded in the agreement.
Calculation
Downtime = (1 − uptime%) × period. E.g. 99.9% over 1 year = 0.001 × 8760h = 8.76h max downtime.