"The Juggernaut possesses Class 100 strength, enabling him to lift (press) over 100 tons. The Juggernaut is said to be unstoppable, and the upper limit to his strength is not known".
" Until recent times, the Juggernaut possessed a variety of superhuman physical abilities mystical in origin.
The Juggernaut possessed vast superhuman strength, the limits of which were never revealed. The Juggernaut's strength was sufficient for him to battle powerhouses such as Thor and the Incredible Hulk, placing his strength well into the Class 100 level, being able to lift in excess of 100 tons. Truly, only the Hulk was ever observed to be able to match the Juggernaut's nearly limitless physical strength
Aside from his incredible strength, the Juggernaut's body possessed an extraordinary degree of invulnerability to injury, allowing him to trade blows with some of the strongest heroes of the Marvel Universe. The Juggernaut could withstand high powered energy blasts, falls from great heights, exposure to temperatures greater than that of the surface of the Sun, exposure to vaccum environments, etc. without sustaining even the slightest injury The Juggernaut could increase his invulnerability to even higher levels by generating a mystical forcefield around his body. This field was sufficient to enable him to withstand powerful energy blasts from beings as powerful as the Silver Surfer, multiple blows from Thor's hammer, and Wolverine's adamantium claws.
The Juggernaut was, literally, an unstoppable force. Once in motion, whether it be running or walking, no physical force could prevent his forward momentum. His pace could be slowed considerably by powerful energy blasts, many tons of rocks, etc. but nothing completely halted his forward momentum. This is true with the one exception of his battle with the Incredible Hulk as War II where much to Juggernaut's shock he was stopped".
Marvel own Wed Site gives him a 7 Strength level which is Incalcuable Strength on par with Hulk Thanos Thor Abomination and The Destroyer.