They'll generally declare it to be a 3-ton, 6-ton, or whatever weight capacity it's capable of lifting right in the name.
Thankfully, the weight capacity is often the first thing manufacturers tell you about.
After all, if the floor jack can't lift what you need it to, it's of no use to you. Weight capacity: The first and easiest detail to sort out is the weight capacity of any floor jack you're considering.
