Uptime Calculator

Uptime is a measurement of a machine's availability and reliability. It describes the period during which the device (usually a computer or a server) is on and operating.

Uptime is usually given in percentage, but sometimes we tend to omit the percentage (%) sign. You can encounter records that include the 99.97 uptime or 99.99 % of uptime

So what does 99.9 mean exactly? ℹ️

99.9 uptime means that the machine (possibly a server) was working and available for users for 99.9% of the time.

This value is especially crucial for internet-based enterprises or businesses that require fast and reliable networks (e.g., financial operations).

Looking for more time management calculators? Let's try out a few of them:

• Time value of money calculator 💵
• Advanced day counter 📅
• Time card calculator (or work time) 🕒

Our SLA calculator is an exceptionally intuitive tool that requires precisely two steps:

1. Enter your uptime in %.

2. Choose whether you prefer to display the precise downtime or uptime of your device/network.

💡 If you want to, you may change the units in which the downtime or uptime are displayed — simply click on the blue-colored elements next to your variables.

For your convenience, our network availability calculator will display your results in detail by default and count them down to 1/100 of the second — look at the grey fields underneath.

🎉Happy with the results? You may also discover the download time calculator.

Our uptime/downtime percentage calculator uses the following equations:

Downtime = 100% − Uptime (when both downtime and uptime are given in percentages)

or

Downtime = 1 − Uptime (when both of these values are given in fractions — you may use our fraction to percent calculator since it works both ways!).

1. For a daily time in seconds:

   Daily downtime periods = 86400 − (Uptime × 86400)

   Daily uptime periods = Uptime × 86400

   where:

   • Uptime is given as a fraction.

2. For a weekly time in seconds:

   Weekly downtime periods = 604800 − (Uptime × 604800)

   Weekly uptime periods = Uptime × 604800

   where:

   • Uptime is given as a fraction.

3. For a monthly time in seconds:

   Monthly downtime periods = 2592000 − (Uptime × 2592000)

   Monthly uptime periods = Uptime × 2592000

   where:

   • Uptime is given as a fraction.

4. For a yearly time in seconds:

   Yearly downtime periods = 31536000 − (Uptime × 31536000)

   Yearly uptime periods = Uptime × 31536000

   where:

   • Uptime is given as a fraction.

🔅 Let's follow the example of a weekly uptime 99.9 calculation:

We first need to calculate the 100% of seconds in a week:

• Every minute has 60 second
• Every hour has 60 minutes
• Every day has 24 hours
• Every week has 7 days

Let's multiply all these numbers: 60×60×24×7 = 604,800

The whole week, that is 100% of the time, equals 604,800 seconds.

Our uptime was 99.9%, which is 99.9% / 100 = 0.999 in fractional form.

Let's multiply the uptime fraction by the total number of seconds in a week:

0.999 × 604,800 seconds = 604,195.5 seconds

Our server was up for 604,195.5 seconds in a week.

🔅 To calculate the downtime:

Downtime = 1 − Uptime

Downtime = 1 − 0.999 = 0.001

Let's multiply the downtime fraction by the total number of seconds in a week:

0.001 × 604,800 seconds = 604.8 seconds

Our server was down for 604.8 seconds in a week.

Is everything done? Let's practice! Calculate the following uptimes:

• 99.99 uptime; and
• 99.999 uptime ⏰