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the length of the bed frame is75" and width is 53" the hinges are long the length edge. the drawing shows the dark lines of how the rope is set up. the mattress is a full size 8" coil spring futon (60lbs) 1.5 sheets of plywood at 1/2"x75"x60" looking to find what i need for counter weight and the math to get the answer. thank you for your time.

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I've added some photos, after doing some math and getting the equation, It works great and I added a safty line on the weight so IF it breaks it's safe. Now off to automotive, got brakes to replace (my best subject) I wrapped the bricks in towel to help slid, wicked good. maine ah out

I know the length, heigth, width, depth, and the weight of the lift (80+- lbs). now I'm looking for the equation of the weight should be to assist in the lift. I like learning equations. I'll check other web site :-) thank you

What about the weight of everything else ?

A counter WEIGHT for a system like this is a very bad idea, because the weight required varies as a function of the angle between the strings and the supporting pulley.

You really need springs, where the tension is a function of the extended length.

I'm sure you can get a look at such a bed at a sleep center. Materials are the key to make the bed light and strong... If you don't know what they are, how you gonna math unknown numbers...