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Not easily!
Calculating it on paper is difficult as the leaves come it at different points and have different rates and lengths. They are a progressive spring by nature.
To measure it on the car you'd need to compress the spring and measure the force required to move it one inch (and because it's progressive you'd want to do it at two inches and three inches too). How you do that is a different matter. Bathroom scales won't be strong enough. You could remove it from the car, clamp it down, and hang known weights from the end and measure the deflection...
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