---
type: "fhirpath-function"
title: "FHIRPath Function: floor"
function: "floor"
category: "Math"
section: "5.8.4"
source: "fhirpath/functions.json"
---
# FHIRPath Function: floor
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Returns the first integer less than or equal to the input.
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Accepts input types of Decimal or Quantity.
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When used with a Decimal input type, the result is an Integer.<br/>
When used with a Quantity, the result is a Quantity with the same units and the value *(Decimal)* set to the integer result calculated.
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If the input collection is empty, the result is empty.
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If the input collection contains multiple items, the evaluation of the expression will end and signal an error to the calling environment.
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``` fhirpath
1.floor() // 1
2.1.floor() // 2
(-2.1).floor() // -3
```
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> Note: We may consider a FloorLong() function to handle Long output types.
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## Summary
- **Category**: Math
- **Section**: `5.8.4`
- **Return Type**: `Integer | Quantity`
- **Empty Input Result**: `empty`
- **Errors on Multiple Input**: `true`
## Description
Returns the first integer less than or equal to the input.
## Arguments
- none
## Type Mapping
- `Integer-Integer`
- `Decimal-Integer`
- `Quantity-Quantity`
## Example
```fhirpath
1.floor() // 1
2.1.floor() // 2
(-2.1).floor() // -3
```