Confidence Interval Calculator


Upper and Lower Bound Calculator

Confidence interval calculator is online calcualtor to find lower bound and upper bound statistics.

Upper and lower bound calculator

  • lower bound calculator
  • upper bound calculator

Here are the major steps of using this confidence interval calculation tool.

  • Enter Confidence Level, Mean, Sample Size and Standard Deviation

When you are using this tool, a total of four inputs need to be entered. These include the confidence level which is in percentage form, mean value, value of SD and size of sample. Consider that the confidence level is 80%, mean is 20, sample size is 15 and standard deviation is 12. Simply enter these values in the text boxes provided. After that, you only have to click the calculate button to produce the output.

  • Checking the values of confidence interval, lower bound and upper bound

In accordance with the input values entered by the user, a total of three outputs are produced.  These include the lower bound, upper bound and confidence interval. Let us consider the values mentioned above.

  1. Confidence level is 80%
  2. Mean is 20
  3. Sample size is 15
  4. Standard Deviation is 12.

When you enter the input values listed above, the following results would be shown on your screen.

  • Lower bound is 16
  • Upper Bound is 24
  • Confidence Interval is 3.97

However, you can also calculate the average confidence interval by using an average calculator by entering multiple confidence interval values.


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