Can weak force be calculated? If yes, how so?

Equations describing the interactions of gravity and electromagnetic force can be calculated, while the mass difference between a nucleus and its constituent parts serves as a measure of the strong force.

The weak force is distinct from other forces in that it is an interaction that changes a particle from one state to another rather than a force that causes particles to attract or repel one another.

One way to look at it is that in an atomic nucleus, the strong force that holds protons and neutrons together is in conflict with the electromagnetic force that causes positively charged protons to repel one another. If a nucleus is unstable due to an excess of protons, the weak force can convert a proton into a neutron to stabilize it.

The decay of a proton into a neutron, positron, and electron neutrino is described by the weak force.

Yes, weak force interactions can be calculated using mathematical frameworks like quantum field theory. Specifically, the theory of electroweak interaction combines electromagnetic and weak interactions into a unified framework. Calculations involve Feynman diagrams to represent particle interactions and perturbation theory to make predictions.