The amazing thing about the Hulk is that unlike nearly every other superhero ever created, the Hulk's strength has absolutely no upper limit. He can lift a commercial airplane – which weighs around 100 tons – when he is at his calmest; that's no problem for him.
Strength. Captain Marvel can lift 200 tons when in Binary mode—a hefty 400,000 pounds that is well over the combined lift of Cap, Iron Man, Widow, Black Panther, Scarlet Witch, Vision, Ant-Man, the Wasp, Doctor Strange, and Hawkeye.
Colossus' incredible strength class is 100+, which means he can consistently lift above 100 tons. Colossus' most ridiculous feats in the comics further prove his elevated strength class.
“Hulk is the strongest there is” is always a safe rule to follow. Hulk and Thor are probably of similar strength “at rest,” and Captain Marvel might be able to charge up her lifting ability to that level (though she's usually more of a “flying blaster” type), but Hulk's entire “thing” is strength.
Assuming a proportional relationship between grip strength and what the average male American can lift, back-of-the-envelope math suggests Thanos could heft 120 million pounds, 10 million pounds more than the weight of the Titanic.
UNLIMITED STRENGTH
The answer; there isn't one. The amazing thing about the Hulk is that unlike nearly every other superhero ever created, the Hulk's strength has absolutely no upper limit. He can lift a commercial airplane – which weighs around 100 tons – when he is at his calmest; that's no problem for him.
Superhuman Strength: Loki, without the aid of anything, through his own biology, possesses superhuman strength that is substantially superior to that of an average Asgardian male. He possesses sufficient physical strength to lift up to 50 tons.
Great Power. Like his namesake, Spider-Man's strength and agility stand far above those of the average human, allowing him to lift nearly ten tons and to leap and move at incredible speeds with high accuracy.
Superhuman Strength: Deadpool is rated as having a low degree of superhuman strength allowing him to lift 800 pounds. Peak Human Speed: Deadpool can run as fast as a trained athlete.
A spider can lift 170x their weight, and if Peter has inherited a spider's powers, he could lift about 25000 pounds, roughly translating to 12.5 ton. But in the comics it has been proven he can lift up to 100-300 tons if under extreme conditions.
According to his official Marvel page, Spider-Man is capable of lifting up to ten tons, and that means that he is a lot stronger than some of the other characters that have peak-human strength. However, Spider-Man's strength pales in comparison to the likes of Thor and the Hulk.
Superhuman Strength: Thor possesses class 100 strength and is easily capable of lifting 100 tons. Superhuman Durability: While in the form of an Asgardian Goddess, Thor possesses virtual invulnerability and immunity to all known Earthly diseases and infections.
Strength Level: At full power, Galactus possesses Class 100 strength, enabling him to lift well over 100 tons, and he can use his vast power to increase his strength immeasurably beyond that.
Strength Level: Venom possesses superhuman strength enabling him to lift (press) almost 11 tons. Known Superhuman Powers: The alien costume, which has grafted itself to the nervous system of Eddie Brock, somehow absorbed the powers of Spider-Man during its brief symbiotic relationship with him.
Thor can lift well over 100 tons with no difficulty, he is in the so-called Class-100 strength category. This means he is in the same strength category as the Hulk, but we have seen in Thor: Ragnarok that Thor can catapult the Hulk to the other side of the room with ease.
The Hulk: 11 million lb.
In the MCU, he's rarely seen lifting solid objects; he usually winds up smashing them instead.
The adamantium renders his bones virtually unbreakable and his claws capable of penetrating almost any substance depending on its thickness and the force he exerts. His reinforced skeleton also enables him to withstand heavy physical pressure, giving his muscles sufficient force to briefly lift 800 pounds or more.
While not superhuman, he is nearly as strong as a human being can become. He can lift (press) a maximum of 750 pounds with supreme effort. Abilities: An accomplished gymnast and acrobat, T'Challa is also an expert tracker. In addition, he has mastered various African martial arts.
Strength Level: Hercules is of "Class 100" strength, able to lift (press) over 100 tons. (The average male Olympian god is capable of lifting about 25 tons.) Known Superhuman Powers: Hercules' principal power is his superhuman strength.
Gamora is incredibly strong, as she is capable of lifting up to 25 tons. This is due to the fact she isn't a human but rather a Zehoberei alien. Much of her strength can likewise be owed to Thanos' cybernetic enhancements, as the majority of her skeleton has been replaced.
How high that strength level rises would vary in different comic books, but most classify Thor in the “Class-100” strength category, which means he can lift well over 100 tons without too much difficulty.
In fact, the comics have put Superman's strength at a point where he's able to lift around 2 billion tons! To put that into perspective, the Empire State Building is only 365,000 tons!
Batman's Strength Is On A Nearly Superhuman Level
In Batman #655, Bruce is shown to be bench pressing over 1000 pounds during one of his regular workouts. In Batman Odyssey #2, Bruce mentions that his maximum leg press is 2500 pounds.
The Extremis armor increases Stark's strength to the point that he is able to lift up to 100 tons, the same as a calm Hulk.