To calculate weight on a Powerhouse WM1501 machine, you need to adjust the weight stack to your desired resistance level by adding or removing weight plates. The weight amount is typically labeled on each weight plate, and you can multiply the number of plates you select by their weight to determine the total weight being lifted. For example, if each plate is 10 pounds and you select 4 plates, the total weight lifted would be 40 pounds.
Unfortunately, you cannot buy additional plates specifically designed for the Powerhouse WM1501. However, you may be able to find compatible weight plates from other brands that can fit the machine's weight stacks. It's important to ensure that the plates you purchase are of the correct size and weight to maintain safety and proper functionality.
According to the manual: 1st plate is 30 lbs and add 12 lbs for each additional plate for a max of 126 lbs.