Use ParamRef() in an MDX calculated measure to read a parameter's runtime value:

ParamRef("ParameterName")

The parameter name must be a quoted string constant and must match the definition exactly, including case and spaces. ParamRef() returns the current runtime value; when no current value is available, it uses the parameter's Default value.

Example

For a Numeric parameter named GrowthRate that stores a decimal rate (0.1 means 10%):

[Measures].[Net Sales] * (1 + ParamRef("GrowthRate"))

If you instead store percentage points (10 means 10%), divide by 100:

[Measures].[Net Sales] * (1 + ParamRef("GrowthRate") / 100)

${name} text substitution

A formula can also contain ${name}. Datafor replaces it with the parameter value (the bound filter's value, otherwise the default) before the formula is parsed. Because it is plain text substitution, quote text values yourself:

IIf([Store].CurrentMember.Name = "${Region}", [Measures].[Net Sales], NULL)

[Measures].[Net Sales] * (1 + ${GrowthRate})

Use ParamRef() when the value is a number you compute with, and ${name} when you need the value inside a string or an MDX expression.

Create the measure

Create a report-level measure with New measure → New measure in the component's Measures picker; Insert parameter adds a ParamRef() for the parameter you pick. See Calculated Measures for the steps and What-if Analysis for a complete example with a slider. A name that does not match a parameter gives Unknown parameter when the component queries.

Related: Creating Parameters · Bind Filters to Parameters