diff --git a/src/Checks/DatabaseSizeCheck.php b/src/Checks/DatabaseSizeCheck.php
new file mode 100644
index 0000000..53c38c3
--- /dev/null
+++ b/src/Checks/DatabaseSizeCheck.php
@@ -0,0 +1,74 @@
+<?php
+
+namespace Vormkracht10\LaravelOK\Checks;
+
+use Illuminate\Database\ConnectionResolverInterface;
+use Illuminate\Database\MySqlConnection;
+use Illuminate\Database\PostgresConnection;
+use Vormkracht10\LaravelOK\Checks\Base\Check;
+use Vormkracht10\LaravelOK\Checks\Base\Result;
+
+class DatabaseSizeCheck extends Check
+{
+    protected string $connection;
+
+    protected int $max;
+
+    public function onConnection(string $name): static
+    {
+        $this->connection = $name;
+
+        return $this;
+    }
+
+    public function setMaxDatabaseSizeInGigabytes(int $amount): static
+    {
+        return $this->setMaxDatabaseSizeInMegabytes($amount * 1024);
+    }
+
+    public function setMaxDatabaseSizeInMegabytes(int $amount): static
+    {
+        return $this->setMaxDatabaseSize($amount * 1024 * 1024);
+    }
+
+    public function setMaxDatabaseSize(int $bytes): static
+    {
+        $this->max = $bytes;
+
+        return $this;
+    }
+
+    public function run(): Result
+    {
+        $result = Result::new();
+
+        $max = $this->max * 1024 * 1024 * 1024;
+
+        $size = $this->getDatabaseSize();
+
+        if ($size > $max) {
+            $mb = fn ($bytes) => round($bytes / 1024 / 1024);
+
+            return $result->failed("Database has a size of {$mb($size)}MB, max is configured at {$mb($max)}MB");
+        }
+
+        return $result->ok('Database size is under the configured threshold');
+    }
+
+    protected function getDatabaseSize(): int
+    {
+        $connectionName = $this->connection ?? config('database.default');
+
+        $connection = app(ConnectionResolverInterface::class)->connection($connectionName);
+
+        return match (true) {
+            $connection instanceof MySqlConnection => $connection->selectOne('SELECT size FROM (SELECT table_schema "name", ROUND(SUM(data_length + index_length)) AS size FROM information_schema.tables GROUP BY table_schema) alias_one WHERE name = ?', [
+                $connection->getDatabaseName(),
+            ])->size,
+            $connection instanceof PostgresConnection => $connection->selectOne('SELECT pg_database_size(?) AS size;', [
+                $connection->getDatabaseName(),
+            ])->size,
+            default => throw new \Exception("Database [{$connection->getDatabaseName()}] not supported"),
+        };
+    }
+}