95% uptime

Ninety-five percent still allows more than a day and a half of downtime a month, which is why it survives mainly in internal tooling rather than in anything a customer pays for.

1d 12h of downtime allowed per month

95% uptime by period

A month is taken as 30 days, a quarter as 90 days and a year as 365 days.

Period	Allowed downtime	Required uptime
Per day	1h 12m	22h 48m
Per week	8h 24m	6d 15h
Per month	1d 12h	28d 12h
Per quarter	4d 12h	85d 12h
Per year	18d 6h	346d 18h

Where 95% is used

Common in internal admin panels, reporting jobs and non-revenue services. Also the level a lot of self-hosted side projects actually achieve without anyone measuring it.

What it demands

Almost nothing operationally. A daily human check would catch most breaches. The value of measuring it is knowing whether you are really at 95% or telling yourself you are.

One step either way

Dropping to 90% widens the monthly budget to 3d. Moving up to 99% cuts it to 7h 12m.

Measuring it

You cannot report on a service level you are not measuring at a finer resolution than the budget itself. At 95% the monthly allowance is 1d 12h, so a check interval anywhere near that figure will miss breaches entirely. Work out your own numbers, or monitor it continuously from four regions, free to start.

Other service levels

Compare the tiers

Every common service level, and the downtime each one allows per month.

90% 3d / month one nine 99% 7h 12m / month two nines 99.5% 3h 36m / month 99.9% 43m 12s / month three nines 99.95% 21m 36s / month 99.99% 4m 19s / month four nines 99.999% 26s / month five nines

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