---
type: "fhirpath-operator"
title: "FHIRPath Operator: * (multiply)"
operator: "*"
category: "Math"
section: "6.6.1"
source: "fhirpath/operations.json"
---
# FHIRPath Operator: * (multiply)
Multiplies both arguments (supported for Integer, Decimal, and Quantity). For multiplication involving quantities, the resulting quantity will have an appropriate unit as determined by application of the UCUM specification:

``` fhirpath
12 'cm' * 3 'cm' // 36 'cm2'
3 'cm' * 12 'cm2' // 36 'cm3'
```
## Summary
- **Category**: Math
- **Section**: `6.6.1`
- **Left Argument**: `Integer | Decimal | Quantity`
- **Right Argument**: `Integer | Decimal | Quantity`
- **Return Type**: `Integer | Decimal | Quantity`
- **Empty Input Result**: `empty`
- **Errors on Multiple Input**: `true`
## Description
Multiplies both arguments. Each operand must be a single element. Both operands must be of the same type or compatible types. For quantities, the resulting quantity will have an appropriate unit as determined by UCUM specification.
## Type Mapping
- `Integer-Integer`
- `Decimal-Decimal`
- `Integer-Decimal`
- `Decimal-Integer`
- `Quantity-Quantity`