Uptime Calculator
Table of contents
Uptime — what does it mean?How to use the uptime calculatorHow to calculate uptime and downtimeUptime calculations examplesUptime calculator is an efficient tool that will compute the downtime and uptime of your network, based on the uptime SLA percentage (service level agreement percentage).
Wondering what's the exact difference between 99.999 uptime and 99.9 availability? Want to know what's the server uptime calculation formula?
Carefully follow the article below to discover all of that and more! 📺
Uptime — what does it mean?
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 internetbased 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) 🕒
How to use the uptime calculator
Our SLA calculator is an exceptionally intuitive tool that requires precisely two steps:

Enter your uptime in %.

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 bluecolored 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.
How to calculate uptime and downtime
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!).

For a daily time in seconds:
Daily downtime periods = 86400 − (Uptime × 86400)
Daily uptime periods = Uptime × 86400
where:
 Uptime is given as a fraction.

For a weekly time in seconds:
Weekly downtime periods = 604800 − (Uptime × 604800)
Weekly uptime periods = Uptime × 604800
where:
 Uptime is given as a fraction.

For a monthly time in seconds:
Monthly downtime periods = 2592000 − (Uptime × 2592000)
Monthly uptime periods = Uptime × 2592000
where:
 Uptime is given as a fraction.

For a yearly time in seconds:
Yearly downtime periods = 31536000 − (Uptime × 31536000)
Yearly uptime periods = Uptime × 31536000
where:
 Uptime is given as a fraction.
Uptime calculations examples
🔅 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 ⏰