uninsulated pipes

I want to convert my basement for living space and leave the pipes overhead uninsulated for steam heat since radiators will all be below the water line unless I hang them from the walls. I want to know if you could figure out the EDR for bare pipe like you figure it out for radiators when you measure their height, tubes, and sections. I guess you would just measure thickness and length.I can see all the pipes and can measure them all. How much EDR does 10 feet of 2 inch pipe put out? 1 1/2?, 1 1/4? What are the specific conversions so I dont't have to rely on vague estimations(add around 33%,60% etc.)and know if my boiler capacity can handle it. Please, one of you big brains out there get back to me. I need answers. Thanks, LEON in NJ