diff --git a/src/Mixins/Expectation.php b/src/Mixins/Expectation.php
index 303a3965..fa6c6ee8 100644
--- a/src/Mixins/Expectation.php
+++ b/src/Mixins/Expectation.php
@@ -272,6 +272,23 @@ final class Expectation
         return $this;
     }
 
+    /**
+     * Asserts that the size of the value and $expected are the same.
+     *
+     * @param  array<int|string, mixed>  $expected
+     * @return self<TValue>
+     */
+    public function toHaveSameSize(iterable $expected, string $message = ''): self
+    {
+        if (! is_countable($this->value) && ! is_iterable($this->value)) {
+            InvalidExpectationValue::expected('countable|iterable');
+        }
+
+        Assert::assertSameSize($expected, $this->value, $message);
+
+        return $this;
+    }
+
     /**
      * Asserts that the value contains the property $name.
      *
diff --git a/tests/Features/Expect/toHaveSameSize.php b/tests/Features/Expect/toHaveSameSize.php
new file mode 100644
index 00000000..9039f0c1
--- /dev/null
+++ b/tests/Features/Expect/toHaveSameSize.php
@@ -0,0 +1,24 @@
+<?php
+
+use Pest\Exceptions\InvalidExpectationValue;
+use PHPUnit\Framework\ExpectationFailedException;
+
+test('failures with wrong type', function () {
+    expect('foo')->toHaveSameSize([1]);
+})->throws(InvalidExpectationValue::class, 'Invalid expectation value type. Expected [countable|iterable].');
+
+test('pass', function () {
+    expect([1, 2, 3])->toHaveSameSize([4, 5, 6]);
+});
+
+test('failures', function () {
+    expect([1, 2, 3])->toHaveSameSize([1]);
+})->throws(ExpectationFailedException::class);
+
+test('failures with message', function () {
+    expect([1, 2, 3])->toHaveSameSize([1], 'oh no!');
+})->throws(ExpectationFailedException::class, 'oh no!');
+
+test('not failures', function () {
+    expect([1, 2, 3])->not->toHaveSameSize([1]);
+});