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Uptime / SLA Calculator

Convert an uptime percentage (SLA) into allowed downtime per year and month.

Inputs

Saved Scenarios

— select 2+ to compare

Downtime/Year (minutes)

525.6

Downtime/Month (minutes)

43.80

Spark says

How it's calculated

Formula

Downtime=(1−Uptime%100)×Minutes in PeriodDowntime = \left(1 - \dfrac{Uptime\%}{100}\right) \times Minutes\ in\ Period
Uptime\%
— The SLA percentage, e.g. 99.9

What is the Uptime / SLA Calculator?

Cloud and hosting providers advertise reliability as an uptime percentage — this calculator converts that into concrete allowed downtime, since small percentage differences translate to very different real-world outage budgets.

How to use it

  1. 1 Select the uptime percentage (SLA tier).

Worked examples

99.9% uptime

About 525.6 minutes (8.76 hours) of downtime allowed per year.

Try it

Frequently asked questions

Why does each extra '9' matter so much?

Each additional nine cuts allowed downtime by roughly 10x — going from 99.9% to 99.99% cuts yearly downtime from about 8.76 hours to under an hour.