diff --git a/app/Http/Controllers/FoodController.php b/app/Http/Controllers/FoodController.php
index 4f93ea6..74a9f41 100644
--- a/app/Http/Controllers/FoodController.php
+++ b/app/Http/Controllers/FoodController.php
@@ -3,6 +3,8 @@
 namespace App\Http\Controllers;
 
 use App\Models\Food;
+use App\Rules\StringIsDecimalOrFraction;
+use App\Support\Number;
 use App\Support\Nutrients;
 use Illuminate\Contracts\View\View;
 use Illuminate\Http\RedirectResponse;
@@ -70,7 +72,7 @@ class FoodController extends Controller
             'name' => 'required|string',
             'detail' => 'nullable|string',
             'brand' => 'nullable|string',
-            'serving_size' => 'required|numeric',
+            'serving_size' => ['required', new StringIsDecimalOrFraction],
             'serving_unit' => 'nullable|string',
             'serving_weight' => 'required|numeric',
             'calories' => 'nullable|numeric',
@@ -80,6 +82,7 @@ class FoodController extends Controller
             'carbohydrates' => 'nullable|numeric',
             'protein' => 'nullable|numeric',
         ]);
+        $attributes['serving_size'] = Number::floatFromString($attributes['serving_size']);
         $food->fill(array_filter($attributes))->save();
         return redirect(route('foods.show', $food))
             ->with('message', 'Changes saved!');
diff --git a/app/Http/Controllers/JournalEntryController.php b/app/Http/Controllers/JournalEntryController.php
index 93dd2c5..3fd44cf 100644
--- a/app/Http/Controllers/JournalEntryController.php
+++ b/app/Http/Controllers/JournalEntryController.php
@@ -9,6 +9,8 @@ use App\Models\Food;
 use App\Models\JournalEntry;
 use App\Models\Recipe;
 use App\Rules\ArrayNotEmpty;
+use App\Rules\StringIsDecimalOrFraction;
+use App\Support\Number;
 use App\Support\Nutrients;
 use Illuminate\Contracts\View\View;
 use Illuminate\Http\RedirectResponse;
@@ -82,7 +84,7 @@ class JournalEntryController extends Controller
             'date' => 'required|date',
             'meal' => 'required|string',
             'amounts' => ['required', 'array', new ArrayNotEmpty],
-            'amounts.*' => 'required_with:foods.*,recipes.*|nullable|numeric|min:0',
+            'amounts.*' => ['required_with:foods.*,recipes.*', 'nullable', new StringIsDecimalOrFraction],
             'units' => ['required', 'array', new ArrayNotEmpty],
             'units.*' => 'nullable|string',
             'foods' => 'required|array',
@@ -119,7 +121,7 @@ class JournalEntryController extends Controller
                 $food = $foods->get($id);
                 $nutrient_multiplier = Nutrients::calculateFoodNutrientMultiplier(
                     $food,
-                    $input['amounts'][$key],
+                    Number::floatFromString($input['amounts'][$key]),
                     $input['units'][$key],
                 );
                 foreach ($nutrients as $nutrient => $amount) {
@@ -134,7 +136,7 @@ class JournalEntryController extends Controller
             foreach ($recipes_selected as $key => $id) {
                 $recipe = $recipes->get($id);
                 foreach ($nutrients as $nutrient => $amount) {
-                    $nutrients[$nutrient] += $recipe->{"{$nutrient}PerServing"}() * $input['amounts'][$key];
+                    $nutrients[$nutrient] += $recipe->{"{$nutrient}PerServing"}() * Number::floatFromString($input['amounts'][$key]);
                 }
                 $summary[] = "{$input['amounts'][$key]} {$input['units'][$key]} {$recipe->name}";
             }
diff --git a/app/Http/Controllers/RecipeController.php b/app/Http/Controllers/RecipeController.php
index db5c691..e56309c 100644
--- a/app/Http/Controllers/RecipeController.php
+++ b/app/Http/Controllers/RecipeController.php
@@ -7,6 +7,8 @@ use App\Models\FoodAmount;
 use App\Models\Recipe;
 use App\Models\RecipeStep;
 use App\Rules\ArrayNotEmpty;
+use App\Rules\StringIsDecimalOrFraction;
+use App\Support\Number;
 use Illuminate\Contracts\View\View;
 use Illuminate\Http\RedirectResponse;
 use Illuminate\Http\Request;
@@ -63,7 +65,7 @@ class RecipeController extends Controller
             'description' => 'nullable|string',
             'servings' => 'required|numeric',
             'foods_amount' => ['required', 'array', new ArrayNotEmpty],
-            'foods_amount.*' => 'required_with:foods.*|nullable|numeric|min:0',
+            'foods_amount.*' => ['required_with:foods.*', 'nullable', new StringIsDecimalOrFraction],
             'foods_unit' => ['required', 'array'],
             'foods_unit.*' => 'nullable|string',
             'foods' => ['required', 'array', new ArrayNotEmpty],
@@ -88,7 +90,7 @@ class RecipeController extends Controller
                 $weight = 0;
                 foreach (array_filter($input['foods_amount']) as $key => $amount) {
                     $food_amounts[$key] = new FoodAmount([
-                        'amount' => (float) $amount,
+                        'amount' => Number::floatFromString($amount),
                         'unit' => $input['foods_unit'][$key],
                         'weight' => $weight++,
                     ]);
diff --git a/app/Rules/StringIsDecimalOrFraction.php b/app/Rules/StringIsDecimalOrFraction.php
new file mode 100644
index 0000000..ba27a33
--- /dev/null
+++ b/app/Rules/StringIsDecimalOrFraction.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Rules;
+
+use App\Support\Number;
+use Illuminate\Contracts\Validation\Rule;
+
+class StringIsDecimalOrFraction implements Rule
+{
+    /**
+     * Determine if the string is a decimal or fraction, excluding zero.
+     *
+     * @param string $attribute
+     * @param mixed $value
+     * @return bool
+     */
+    public function passes($attribute, $value): bool
+    {
+        try {
+            $result = Number::floatFromString($value);
+            return $result != 0;
+        }
+        catch (\InvalidArgumentException $e) {
+            // Allow to pass through, method will return false.
+        }
+        return false;
+    }
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message(): string
+    {
+        return 'The :attribute must be a decimal or fraction.';
+    }
+}
diff --git a/app/Support/Number.php b/app/Support/Number.php
new file mode 100644
index 0000000..d5697a5
--- /dev/null
+++ b/app/Support/Number.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Support;
+
+use Phospr\Fraction;
+
+class Number
+{
+    /**
+     * Get a float value from a decimal or fraction string.
+     *
+     * @param string $value
+     *   Value in decimal or string format.
+     * @return float
+     *   Float representation of the value.
+     *
+     * @throws \InvalidArgumentException
+     */
+    public static function floatFromString(string $value): float {
+        if ((float) $value == $value) {
+            $result = (float) $value;
+        }
+        else {
+            $result = Fraction::fromString($value)->toFloat();
+        }
+        return $result;
+    }
+
+    /**
+     * Get a string faction representation of a float.
+     *
+     * @todo Handle repeating values like 1/3, 2/3, etc.
+     *
+     * @see https://rosettacode.org/wiki/Convert_decimal_number_to_rational#PHP
+     *
+     * @param float $value
+     *   Value to convert to string fraction.
+     * @return string
+     *   String fraction.
+     */
+    public static function fractionStringFromFloat(float $value): string {
+        $fraction = (string) Fraction::fromFloat($value);
+        if ($fraction === '33333333/100000000') {
+            $fraction = '1/3';
+        }
+        elseif ($fraction === '66666667/100000000') {
+            $fraction = '2/3';
+        }
+        return $fraction;
+    }
+}
diff --git a/composer.json b/composer.json
index 38f67e0..cbac5de 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,8 @@
         "fruitcake/laravel-cors": "^2.0",
         "guzzlehttp/guzzle": "^7.0.1",
         "laravel/framework": "^8.12",
-        "laravel/tinker": "^2.5"
+        "laravel/tinker": "^2.5",
+        "phospr/fraction": "^1.2"
     },
     "require-dev": {
         "barryvdh/laravel-ide-helper": "^2.9",
diff --git a/composer.lock b/composer.lock
index c84e615..a391417 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "6798cd035bece9ee986d5e3a59036303",
+    "content-hash": "7054301f9158e201ddff5b37f41a1c5a",
     "packages": [
         {
             "name": "asm89/stack-cors",
@@ -1829,6 +1829,49 @@
             },
             "time": "2020-11-07T02:01:34+00:00"
         },
+        {
+            "name": "phospr/fraction",
+            "version": "v1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phospr/fraction.git",
+                "reference": "3f195b920bca0ba4eac8575e397af283782c699d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phospr/fraction/zipball/3f195b920bca0ba4eac8575e397af283782c699d",
+                "reference": "3f195b920bca0ba4eac8575e397af283782c699d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "4.0.*"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Phospr\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Tom Haskins-Vaughan",
+                    "email": "tom@tomhv.uk"
+                }
+            ],
+            "description": "A composer-installable fractions library",
+            "support": {
+                "issues": "https://github.com/phospr/fraction/issues",
+                "source": "https://github.com/phospr/fraction/tree/master"
+            },
+            "time": "2016-12-21T15:33:12+00:00"
+        },
         {
             "name": "phpoption/phpoption",
             "version": "1.7.5",
diff --git a/resources/views/foods/edit.blade.php b/resources/views/foods/edit.blade.php
index c395047..c98a3a1 100644
--- a/resources/views/foods/edit.blade.php
+++ b/resources/views/foods/edit.blade.php
@@ -72,11 +72,10 @@
 
                                     <x-inputs.input id="serving_size"
                                                     class="block mt-1"
-                                                    type="number"
-                                                    step="any"
+                                                    type="text"
                                                     name="serving_size"
                                                     size="10"
-                                                    :value="old('serving_size', $food->serving_size)"/>
+                                                    :value="old('serving_size', \App\Support\Number::fractionStringFromFloat($food->serving_size))"/>
                                 </div>
 
                                 <!-- Serving unit -->
diff --git a/resources/views/foods/index.blade.php b/resources/views/foods/index.blade.php
index bdb7728..16061bc 100644
--- a/resources/views/foods/index.blade.php
+++ b/resources/views/foods/index.blade.php
@@ -33,7 +33,7 @@
                                     </div>
                                 @endif
                                 <div class="font-bold">
-                                    Serving size {{ $food->serving_size }}
+                                    Serving size {{ \App\Support\Number::fractionStringFromFloat($food->serving_size) }}
                                     {{ $food->serving_unit }}
                                     ({{ $food->serving_weight }}g)
                                 </div>
diff --git a/resources/views/journal-entries/create.blade.php b/resources/views/journal-entries/create.blade.php
index 5d0c858..6519955 100644
--- a/resources/views/journal-entries/create.blade.php
+++ b/resources/views/journal-entries/create.blade.php
@@ -60,11 +60,10 @@
                             <x-inputs.label for="recipes" :value="__('Recipe')" class="col-span-4"/>
                             @for ($i = 0; $i < 10; $i++)
                                 <div>
-                                    <x-inputs.input type="number"
+                                    <x-inputs.input type="text"
                                                     name="amounts[]"
                                                     class="block w-full"
-                                                    :value="old('amounts.' . $i)"
-                                                    step="any" />
+                                                    :value="old('amounts.' . $i)" />
                                 </div>
                                 <div class="col-span-2">
                                     <x-inputs.select name="units[]"
diff --git a/resources/views/recipes/create.blade.php b/resources/views/recipes/create.blade.php
index c949ab5..66e570c 100644
--- a/resources/views/recipes/create.blade.php
+++ b/resources/views/recipes/create.blade.php
@@ -69,10 +69,10 @@
                         <h3 class="pt-2 mb-2 font-extrabold">Ingredients</h3>
                         @for($i = 0; $i < 20; $i++)
                             <div class="flex flex-row space-x-4 mb-4">
-                                <x-inputs.input type="number"
+                                <x-inputs.input type="text"
                                                 name="foods_amount[]"
-                                                :value="old('foods_amount.' . $i)"
-                                                step="any" />
+                                                size="5"
+                                                :value="old('foods_amount.' . $i)" />
                                 <x-inputs.select name="foods_unit[]"
                                                  :options="$food_units"
                                                  :selectedValue="old('foods_unit.' . $i)">
diff --git a/resources/views/recipes/show.blade.php b/resources/views/recipes/show.blade.php
index f67e404..c193bba 100644
--- a/resources/views/recipes/show.blade.php
+++ b/resources/views/recipes/show.blade.php
@@ -13,7 +13,7 @@
                     <h3 class="mb-2 mt-4 font-bold">Ingredients</h3>
                     @foreach($recipe->foodAmounts as $ia)
                         <div class="flex flex-row space-x-2 mb-2">
-                            <div>{{ $ia->amount }}</div>
+                            <div>{{ \App\Support\Number::fractionStringFromFloat($ia->amount) }}</div>
                             @if($ia->unit)<div>{{ $ia->unit }}</div>@endif
                             <div>{{ $ia->food->name }}</div>
                         </div>