SLA Availability
Convert an availability percentage into maximum allowed downtime.
SLA Availability Calculator
Convert an SLA percentage into maximum allowed downtime.
IT Calculators
Quickly estimate transfer time, RAID capacity, backup storage, SLA downtime and more.
How to use SLA Availability Calculator
Convert an SLA percentage into maximum allowed downtime.
What this tool is for
A calculator provides an estimate from the values you enter. The result becomes useful when units, assumptions and margins are explicit.
Recommended workflow
- Enter realistic values and carefully check the units.
- Run the calculation and record both the result and the assumptions used.
- Run a second conservative scenario to measure the margin before making a decision.
Best practices
- Always distinguish decimal and binary units when storage is involved.
- Allow margin for protocol overhead, throughput variation and operational uncertainty.
- Use the result as a sizing estimate, not as a contractual guarantee.
Questions about this tool
How is allowed downtime derived from an SLA percentage?
The availability percentage is applied to the selected period, and the unavailable fraction becomes the theoretical maximum downtime.
Does planned maintenance count as downtime?
That depends on the SLA contract. Some agreements exclude scheduled maintenance; others include it, so compare the result with the actual contractual definition.
Why can monthly and annual figures feel inconsistent?
The same percentage applied to different period lengths produces different absolute downtime. Always compare periods with the same contractual basis.