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Uptime calculator

How much downtime does a percentage allow? Enter a value or pick a common SLA.

Downtime per dayโ€”
per weekโ€”
per monthโ€”
per yearโ€”

What each target allows

Uptime targetDowntime per dayper weekper monthper year
99%โ€”โ€”โ€”โ€”
99.5%โ€”โ€”โ€”โ€”
99.9%โ€”โ€”โ€”โ€”
99.95%โ€”โ€”โ€”โ€”
99.99%โ€”โ€”โ€”โ€”
99.999%โ€”โ€”โ€”โ€”

The nines, explained

99% allows more than three and a half days of downtime per year. 99.9% allows about eight hours and 45 minutes. 99.99% allows under an hour. 99.999% allows about five minutes. Each extra nine costs roughly ten times more engineering effort.

Measure your real uptime

Guessing is not measuring. A free monitor gives you the actual uptime percentage for the last 30 days.

Frequently asked questions

Is downtime per month based on 30 days?+

We use 30.44 days for a month and 365.25 days for a year.

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