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Uptime Calculator

Find uptime percentage from downtime.

Total hours

Downtime

Calculated Output

Uptime (%) 99.792

Formula: uptime = (total − downtime) ÷ total × 100

Step-by-Step Breakdown

1. Values used:

2. Total hours = 720

3. Downtime = 1.5

5. Uptime = 99.792%

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The math behind it

uptime = (total time − downtime) ÷ total time × 100. '99.9%' allows ~8.8 h downtime per year.

1.5 h down in 720 h → 99.79%.

Five nines?

99.999% uptime = only ~5 minutes of downtime per year.