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+---
+title: $let
+description: The $let operator allows defining variables for use in a specified expression, enabling complex calculations and reducing code repetition.
+type: operators
+category: variable-expression
+---
+
+# $let
+
+The `$let` operator is used to define variables for use in a specified expression. It allows you to create temporary variables that can be referenced within the expression, making complex calculations more readable and preventing redundant computations.
+
+## Syntax
+
+```javascript
+{
+  $let: {
+    vars: { 
+      <var1>: <expression1>,
+      <var2>: <expression2>,
+      ...
+    },
+    in: <expression>
+  }
+}
+```
+
+## Parameters
+
+| Parameter | Description |
+| --- | --- |
+| **`vars`** | An object that defines the variables and their values. Each variable is assigned the result of an expression. |
+| **`in`** | The expression that uses the variables defined in the `vars` object. Variables are referenced using `$$<variable_name>`. |
+
+## Examples
+
+Consider this sample document from the stores collection.
+
+```json
+{
+    "_id": "0fcc0bf0-ed18-4ab8-b558-9848e18058f4",
+    "name": "First Up Consultants | Beverage Shop - Satterfieldmouth",
+    "location": {
+        "lat": -89.2384,
+        "lon": -46.4012
+    },
+    "staff": {
+        "totalStaff": {
+            "fullTime": 8,
+            "partTime": 20
+        }
+    },
+    "sales": {
+        "totalSales": 75670,
+        "salesByCategory": [
+            {
+                "categoryName": "Wine Accessories",
+                "totalSales": 34440
+            },
+            {
+                "categoryName": "Bitters",
+                "totalSales": 39496
+            },
+            {
+                "categoryName": "Rum",
+                "totalSales": 1734
+            }
+        ]
+    },
+    "promotionEvents": [
+        {
+            "eventName": "Unbeatable Bargain Bash",
+            "promotionalDates": {
+                "startDate": {
+                    "Year": 2024,
+                    "Month": 6,
+                    "Day": 23
+                },
+                "endDate": {
+                    "Year": 2024,
+                    "Month": 7,
+                    "Day": 2
+                }
+            },
+            "discounts": [
+                {
+                    "categoryName": "Whiskey",
+                    "discountPercentage": 7
+                },
+                {
+                    "categoryName": "Bitters",
+                    "discountPercentage": 15
+                },
+                {
+                    "categoryName": "Brandy",
+                    "discountPercentage": 8
+                },
+                {
+                    "categoryName": "Sports Drinks",
+                    "discountPercentage": 22
+                },
+                {
+                    "categoryName": "Vodka",
+                    "discountPercentage": 19
+                }
+            ]
+        },
+        {
+            "eventName": "Steal of a Deal Days",
+            "promotionalDates": {
+                "startDate": {
+                    "Year": 2024,
+                    "Month": 9,
+                    "Day": 21
+                },
+                "endDate": {
+                    "Year": 2024,
+                    "Month": 9,
+                    "Day": 29
+                }
+            },
+            "discounts": [
+                {
+                    "categoryName": "Organic Wine",
+                    "discountPercentage": 19
+                },
+                {
+                    "categoryName": "White Wine",
+                    "discountPercentage": 20
+                },
+                {
+                    "categoryName": "Sparkling Wine",
+                    "discountPercentage": 19
+                },
+                {
+                    "categoryName": "Whiskey",
+                    "discountPercentage": 17
+                },
+                {
+                    "categoryName": "Vodka",
+                    "discountPercentage": 23
+                }
+            ]
+        }
+    ]
+}
+```
+
+### Example 1: Basic variable usage
+
+Calculate staff efficiency metrics using defined variables.
+
+```javascript
+db.stores.aggregate([
+  { $match: {"_id": "40d6f4d7-50cd-4929-9a07-0a7a133c2e74"} },
+  {
+    $project: {
+      name: 1,
+      staffMetrics: {
+        $let: {
+          vars: {
+            fullTime: "$staff.totalStaff.fullTime",
+            partTime: "$staff.totalStaff.partTime",
+            totalSales: "$sales.totalSales"
+          },
+          in: {
+            totalStaff: { $add: ["$$fullTime", "$$partTime"] },
+            salesPerEmployee: { $divide: ["$$totalSales", { $add: ["$$fullTime", "$$partTime"] }] },
+            fullTimeRatio: { $divide: ["$$fullTime", { $add: ["$$fullTime", "$$partTime"] }] }
+          }
+        }
+      }
+    }
+  }
+])
+```
+
+This query returns the following result.
+
+```json
+[
+  {
+    "_id": '40d6f4d7-50cd-4929-9a07-0a7a133c2e74',
+    "name": 'Proseware, Inc. | Home Entertainment Hub - East Linwoodbury',
+    "staffMetrics": {
+      "totalStaff": 39,
+      "salesPerEmployee": 3893.948717948718,
+      "fullTimeRatio": 0.5128205128205128
+    }
+  }
+]
+```
+
+### Example 2: Nested $let expressions
+
+Calculate location-based insights with nested variable definitions.
+
+```javascript
+db.stores.aggregate([
+  { $match: {"_id": "40d6f4d7-50cd-4929-9a07-0a7a133c2e74"} },
+  {
+    $project: {
+      name: 1,
+      locationInsights: {
+        $let: {
+          vars: {
+            lat: "$location.lat",
+            lon: "$location.lon"
+          },
+          in: {
+            coordinates: { lat: "$$lat", lon: "$$lon" },
+            hemisphere: {
+              $let: {
+                vars: {
+                  northSouth: { $cond: [{ $gte: ["$$lat", 0] }, "North", "South"] },
+                  eastWest: { $cond: [{ $gte: ["$$lon", 0] }, "East", "West"] }
+                },
+                in: {
+                  latitudeHemisphere: "$$northSouth",
+                  longitudeHemisphere: "$$eastWest",
+                  quadrant: { $concat: ["$$northSouth", " ", "$$eastWest"] }
+                }
+              }
+            },
+            distanceFromEquator: { $abs: "$$lat" },
+            distanceFromPrimeMeridian: { $abs: "$$lon" }
+          }
+        }
+      }
+    }
+  }
+])
+```
+
+This query returns the following result.
+
+```json
+[
+  {
+    "_id": '40d6f4d7-50cd-4929-9a07-0a7a133c2e74',
+    "name": 'Proseware, Inc. | Home Entertainment Hub - East Linwoodbury',
+    "locationInsights": {
+      "coordinates": { "lat": 70.1272, "lon": 69.7296 },
+      "hemisphere": {
+        "latitudeHemisphere": 'North',
+        "longitudeHemisphere": 'East',
+        "quadrant": 'North East'
+      },
+      "distanceFromEquator": 70.1272,
+      "distanceFromPrimeMeridian": 69.7296
+    }
+  }
+]
+```