How can I calculate the force

I am doing a lab concerning Hooke's Law. I attached weights of different masses and measured the position the spring stretched to on a Hooke's Law apparatus.

How do I measure the force exerted on the spring in this situation?

Thanks in advance!

Use the law of earth's gravity. "Force=Mass*GravityFeild. If your doing it in metric, the Gravity feild is 9.8, If your doing it in standard, I think it's 16.

Hope that helps!

you calculate the force exerted on the spring by calculating the weight of the mass attached to it. W=m*g. w= weight and m=the mass of your masses and g=gravity which is 9.81. Hope this helps.