Server Uptime Calculator

Last updated: 2026-08-24

Server Uptime Calculator — Calculate uptime percentage and downtime.
Inputs
Result
Enter values and press Calculate

How to use it

  1. Calculate time total in minutes of the period
  2. Divide downtime between total
  3. Subtract of 1 and Multiply per 100
  4. Classify according to nines

Common mistakes

  • ⚠️ Not Use same units of time
  • ⚠️ Confusing uptime with downtime

Worked example

Calculate uptime: 99.9% for 1 year.

Percentage of uptime and clasificación SLA

Input guide

FieldTypical range
period1 day - 365 days
downtime_min0 - several hours