SLA Uptime Calculator
Calculate allowable downtime from an SLA percentage for year, month, and day.
Each additional nine in an uptime percentage sounds like a small difference on paper, 99.9 percent versus 99.99 percent, but the actual allowable downtime behind those numbers changes dramatically, roughly nine hours a year at three nines, down to about five minutes a year at five nines, a gap that's easy to underestimate until it's translated into actual hours and minutes rather than left as an abstract percentage. This tool calculates exactly how much downtime a given SLA percentage actually allows across a year, a month, and a day, turning an uptime commitment into concrete, comparable time figures.
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Useful for understanding what a vendor's uptime guarantee actually promises in real hours rather than an abstract percentage, comparing two SLA offers by their actual allowed downtime instead of just their percentage, or checking whether an internal system's actual uptime record still meets a stated SLA commitment.
Key features
- Clean interface
- Fast processing
- No signup required
- Works offline