Originally Posted by vetteboy79
You don't need to be that scientific about it.
Find something that you know how much it weighs, put it on the spring, measure the deflection.
Hell, put the spring in a doorway and stand on it yourself. Use the door frame to balance while someone else measures the spring. Good enough for a ballpark estimate anyway.
How far does it need to compress to get a somewhat accurate estimate. For example if I (220 lbs) stand on one of the 16 inch 2.5 spring it compresses about 1/2 inch. Does this mean its a 440 lb spring?