diff --git a/app/Models/Ingredient.php b/app/Models/Ingredient.php
index 60946b7..4e255d9 100644
--- a/app/Models/Ingredient.php
+++ b/app/Models/Ingredient.php
@@ -5,6 +5,14 @@ namespace App\Models;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 
+/**
+ * @property string name
+ * @property string unit
+ * @property float calories
+ * @property float protein
+ * @property float fat
+ * @property float carbohydrates
+ */
 class Ingredient extends Model
 {
     use HasFactory;
diff --git a/app/Models/IngredientAmount.php b/app/Models/IngredientAmount.php
index 02d97d0..af366ab 100644
--- a/app/Models/IngredientAmount.php
+++ b/app/Models/IngredientAmount.php
@@ -5,7 +5,15 @@ namespace App\Models;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use JetBrains\PhpStorm\Pure;
 
+/**
+ * @property float amount
+ * @property float unit
+ * @property int weight
+ * @property \App\Models\Ingredient ingredient
+ * @property \App\Models\Recipe recipe
+ */
 class IngredientAmount extends Model
 {
     use HasFactory;
@@ -15,6 +23,7 @@ class IngredientAmount extends Model
      */
     protected array $fillable = [
         'amount',
+        'unit',
         'weight',
     ];
 
@@ -40,7 +49,22 @@ class IngredientAmount extends Model
     /**
      * Get total calories for the ingredient amount.
      */
-    public function calories(): float {
-        return $this->ingredient->calories * $this->amount;
+    #[Pure] public function calories(): float {
+        return $this->ingredient->calories * $this->amount * $this->unitMultiplier();
+    }
+
+    /**
+     * Get the multiplier for the ingredient unit and ingredient amount unit.
+     */
+    private function unitMultiplier(): float {
+        return match (true) {
+            $this->ingredient->unit === 'tsp' && $this->unit === 'tbsp' => 3,
+            $this->ingredient->unit === 'tsp' && $this->unit === 'cup' => 48,
+            $this->ingredient->unit === 'tbsp' && $this->unit === 'tsp' => 1/3,
+            $this->ingredient->unit === 'tbsp' && $this->unit === 'cup' => 16,
+            $this->ingredient->unit === 'cup' && $this->unit === 'tsp' => 1/48,
+            $this->ingredient->unit === 'cup' && $this->unit === 'tbsp' => 1/16,
+            default => 1
+        };
     }
 }
diff --git a/database/migrations/2020_12_21_214128_create_ingredients_table.php b/database/migrations/2020_12_21_214128_create_ingredients_table.php
index f805fff..b49a1f9 100644
--- a/database/migrations/2020_12_21_214128_create_ingredients_table.php
+++ b/database/migrations/2020_12_21_214128_create_ingredients_table.php
@@ -16,7 +16,7 @@ class CreateIngredientsTable extends Migration
         Schema::create('ingredients', function (Blueprint $table) {
             $table->id();
             $table->string('name');
-            $table->string('unit')->nullable();
+            $table->enum('unit', ['tsp', 'tbsp', 'cup'])->nullable();
             $table->unsignedFloat('calories')->default(0);
             $table->unsignedFloat('protein')->default(0);
             $table->unsignedFloat('fat')->default(0);
diff --git a/database/migrations/2020_12_21_215527_create_ingredient_amounts_table.php b/database/migrations/2020_12_21_215527_create_ingredient_amounts_table.php
index 2951c2b..dfe74d6 100644
--- a/database/migrations/2020_12_21_215527_create_ingredient_amounts_table.php
+++ b/database/migrations/2020_12_21_215527_create_ingredient_amounts_table.php
@@ -19,6 +19,7 @@ class CreateIngredientAmountsTable extends Migration
             $table->id();
             $table->foreignIdFor(Ingredient::class);
             $table->unsignedFloat('amount');
+            $table->enum('unit', ['tsp', 'tbsp', 'cup'])->nullable();
             $table->foreignIdFor(Recipe::class);
             $table->unsignedInteger('weight');
             $table->timestamps();
diff --git a/database/seeders/RecipeSeeder.php b/database/seeders/RecipeSeeder.php
index 550c8fa..eab3cc3 100644
--- a/database/seeders/RecipeSeeder.php
+++ b/database/seeders/RecipeSeeder.php
@@ -23,13 +23,15 @@ class RecipeSeeder extends Seeder
                 'ingredient_id' => Ingredient::where('name', 'flour, all-purpose')
                     ->first()->id,
                 'amount' => 1,
+                'unit' => 'cup',
                 'recipe_id' => $recipe->id,
                 'weight' => $weight++,
             ],
             [
                 'ingredient_id' => Ingredient::where('name', 'sugar, white')
                     ->first()->id,
-                'amount' => 0.125,
+                'amount' => 2,
+                'unit' => 'tbsp',
                 'recipe_id' => $recipe->id,
                 'weight' => $weight++,
             ],
@@ -37,6 +39,7 @@ class RecipeSeeder extends Seeder
                 'ingredient_id' => Ingredient::where('name', 'baking powder')
                     ->first()->id,
                 'amount' => 2,
+                'unit' => 'tsp',
                 'recipe_id' => $recipe->id,
                 'weight' => $weight++,
             ],
@@ -44,6 +47,7 @@ class RecipeSeeder extends Seeder
                 'ingredient_id' => Ingredient::where('name', 'salt')
                     ->first()->id,
                 'amount' => 1,
+                'unit' => 'tsp',
                 'recipe_id' => $recipe->id,
                 'weight' => $weight++,
             ],
@@ -58,6 +62,7 @@ class RecipeSeeder extends Seeder
                 'ingredient_id' => Ingredient::where('name', 'milk, whole')
                     ->first()->id,
                 'amount' => 1,
+                'unit' => 'cup',
                 'recipe_id' => $recipe->id,
                 'weight' => $weight++,
             ],
@@ -65,6 +70,7 @@ class RecipeSeeder extends Seeder
                 'ingredient_id' => Ingredient::where('name', 'vegetable oil')
                     ->first()->id,
                 'amount' => 2,
+                'unit' => 'tbsp',
                 'recipe_id' => $recipe->id,
                 'weight' => $weight++,
             ],