Free Local utilities
Uptime/SLA calculator
Calculate a downtime budget or reverse an entered duration into availability. Choose a period and compare 30-day and 365-day budgets. No uptime measurement or SLA certification.
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How it works
Allowed downtime = selected period seconds × (1 − availability/100). Reverse mode uses availability = 100 × (1 − downtime/period seconds). A custom period is 1–3,660 whole days. The 30-day and 365-day comparisons are always seconds, not measured or contractual availability.
Assumptions and limitations
An arithmetic budget, not uptime measurement or an SLA contract interpretation. Calendar months, leap years, exclusions and contractual rounding are not modeled.
How to use this tool
Enter availability between 0 and 100 percent and Calculate. Choose a target budget or reverse calculation from entered downtime. Set the period in days and the downtime unit; entered downtime cannot exceed the period.
Worked example
Demonstration data only. Loading an example replaces the inputs but does not run the tool.
99.9% → 2592 s / 30 d 31536 s / 365 d
Frequently asked questions
What should I check before using this result?
An arithmetic budget, not uptime measurement or an SLA contract interpretation. Calendar months, leap years, exclusions and contractual rounding are not modeled.
Are my inputs or results saved automatically?
No. Processing stays in this browser and leaving the page clears the tool state. Copied or downloaded results remain under your control. Page-loading and privacy controls are described in the Privacy Policy.
Processing and privacy
No. Processing stays in this browser and leaving the page clears the tool state. Copied or downloaded results remain under your control. Page-loading and privacy controls are described in the Privacy Policy.
Privacy PolicyHelp
Enter availability between 0 and 100 percent and Calculate. Choose a target budget or reverse calculation from entered downtime. Set the period in days and the downtime unit; entered downtime cannot exceed the period.
Runs in your browser. Inputs and results are not uploaded or saved by this tool. Copy or download only what you intend to keep.
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