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The CONFIDENCE function is one of the statistical functions. It is used to return the confidence interval.

The CONFIDENCE function syntax is:

CONFIDENCE(alpha, standard-dev, size)


alpha is the significance level used to compute the confidence level, a numeric value greater than 0 but less than 1.

standard-dev is the population standard deviation, a numeric value greater than 0.

size is the sample size, a numeric value greater than or equal to 1.

The numeric values can be entered manually or included into the cells you make reference to.

To apply the CONFIDENCE function,

  1. select the cell where you wish to display the result,
  2. click the Insert function Insert function icon icon situated at the top toolbar,
    or right-click within a selected cell and select the Insert Function option from the menu,
    or click the Function icon icon situated at the formula bar,
  3. select the Statistical function group from the list,
  4. click the CONFIDENCE function,
  5. enter the required arguments separating them by commas,
  6. press the Enter button.

The result will be displayed in the selected cell.


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