[Glossary](https://useratio.app/glossary) › Units and data

# Uptime and downtime

The share of time a service is available, and the time it is not.

99.9% (“three nines”) sounds like nothing is missing. It still allows about 44 minutes of downtime in an average month. Ratio turns the percentage into time.

## In Ratio

| You type | Ratio shows |
| --- | --- |
| `99.9% uptime` | 43 min 50 s |

## Related

[Syntax and examples](https://useratio.app/docs) · [All terms](https://useratio.app/glossary)

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Source: https://useratio.app/glossary/uptime