API SLA Downtime Calculator

Convert an uptime target into allowed downtime and track remaining monthly error budget.

SLA downtime calculatorAPI uptime calculatorerror budget calculator

Translate an uptime commitment into allowed downtime and remaining error budget.

SLA target%Measurement perioddaysObserved downtimeminExcluded downtimeminOnly if your SLA excludes it.

SLA status

Within budget

99.9306% actual uptime

Allowed downtime

43.2 min

99.9% SLA

Remaining budget

13.2 min

69.4% consumed

Counted downtime

30 min

30 day period

Period length43,200 minutes

Observed minus excluded30 minutes

Budget overrun0 minutes

You can absorb about 13.2 more minutes of counted downtime before breaching the target.

Frequently asked questions

Practical answers for applying this calculator to a production API billing or usage plan.

How much downtime does 99.9% allow?

In a 30-day month, 99.9% availability allows about 43.2 minutes of downtime. The exact amount changes with the measurement period.

What counts as downtime?

Define this in the SLA. Many agreements exclude planned maintenance or measure only failed eligible requests, specific regions, or covered endpoints.

What is an error budget?

It is the amount of unreliability permitted by the target. Teams can use the remaining budget to balance release speed against reliability risk.

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