How much does Logan weigh with adamantium fused to his skeleton?

In the Marvel Universe, Logan (a.k.a. Wolverine) weighs approximately 300 pounds with the adamantium fused to his skeleton.

How does he stand weighing that much?

Wolverine is able to stand and move around with the added weight of the adamantium due to his enhanced physical abilities, healing factor, and strength. The adamantium reinforces his skeletal structure, making it extremely durable and resistant to damage, which allows him to support the additional weight. Additionally, Wolverine's muscular strength and agility enable him to move effectively despite the added mass.