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The formula should be included in the field description inside an html comment (so that it remains invisible when showing the field description), preceded by the following keyword: @@Formula: (note the colon at the end). For example:

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You can naturally include the real description of the custom field as well. For example:

The formula itself is a Java-style expression that can reference any issue field value, include arithmetic operators as well as any other Java operator, and Java method calls (such as the .size() example above). Access to issue field values is achieved by the following syntax:

where <field_ID> is a built-in JIRA field ID (see this list) or a custom field ID (in the form customfield_nnnnn).

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Note that you must make sure the formula returns a number, or null.

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Example

Adding two fields

To add two custom fields, such as "Business Value" and "Technical Value" to get an "Overall Value":

<!-- @@Formula: (issue.get("customfield_10114") != null ? issue.get("customfield_10114") : 0) + (issue.get("customfield_10150") != null ? issue.get("customfield_10150") : 0) -->

Custom formatting

You can also specify custom formatting for the value of the Calculated Number field. In the Description field, add your formatting formula using the following syntax:

The formula itself is a Java-style expression that can reference the value returned by the formula using the value variable. You can also use the numberTool object to format the number value:

numberTool.format(value)

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Example

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To display an icon to the left of the field value depending on the field value:

<!-- @@Format: 
if (value > 21)
  return "<img src='/images/icons/priority_trivial.gif'> "+numberTool.format(value);
else if (value >= 10)
  return "<img src='/images/icons/priority_major.gif'> "+numberTool.format(value);
else 
  return "<img src='/images/icons/priority_blocker.gif'> "+numberTool.format(value);
 -->

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