How large can giant squid and colossal squid become?

The giant squid (Architeuthis) and the colossal squid (Mesonychoteuthis hamiltoni) are considered the world's largest invertebrates, though determining their maximum size remains a subject of scientific debate due to their elusive nature.12

• Giant Squid: While historical reports have claimed lengths exceeding 18 meters (59 feet), the maximum total length of scientifically examined specimens is approximately 13 meters (43 feet), including their tentacles. Their wet weight can reach up to one ton (907 kg).12
• Colossal Squid: These are generally considered more robust and heavier than the giant squid. Their body and tentacles combined can measure up to 14 meters (46 feet), and they can weigh more than 500 kg (1,100 pounds). Some researchers suggest they may reach 14 meters in length, though this remains debated.12

Because these cephalopods are rarely observed alive, size estimates are largely based on limited specimens, often found dead or washed ashore.12