diff --git a/src/Mixins/Expectation.php b/src/Mixins/Expectation.php
index 6b69014b..57040711 100644
--- a/src/Mixins/Expectation.php
+++ b/src/Mixins/Expectation.php
@@ -6,6 +6,7 @@ namespace Pest\Mixins;
 
 use BadMethodCallException;
 use Closure;
+use Countable;
 use DateTimeInterface;
 use Error;
 use InvalidArgumentException;
@@ -272,6 +273,22 @@ final class Expectation
         return $this;
     }
 
+    /**
+     * Asserts that the size of the value and $expected are the same.
+     *
+     * @return self<TValue>
+     */
+    public function toHaveSameSize(Countable|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.
      *