---
type: "fhirpath-function"
title: "FHIRPath Function: convertsToQuantity"
function: "convertsToQuantity"
category: "Conversion"
section: "5.5.7.2"
source: "fhirpath/functions.json"
---
# FHIRPath Function: convertsToQuantity
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## Summary
- **Category**: Conversion
- **Section**: `5.5.7.2`
- **Return Type**: `Boolean`
- **Empty Input Result**: `empty`
- **Errors on Multiple Input**: `true`
## Description
If the input collection contains a single item, this function will return true if the item can be converted to a Quantity.
## Arguments
- `unit` (optional): `String` - Optional unit to check convertibility to
## Type Mapping
- `Any-Boolean`
## Example
```fhirpath
'10 mg'.convertsToQuantity() // returns true
'abc'.convertsToQuantity() // returns false
```