What exactly are you trying to do? Is it a BSIM based model? If so you can likely look at the model card and the BSIM manual to plug in the model card values into the equations.
This is not exactly a question with an answer short enough to addressed here. Doing this in a meaningfully accurate way, requires a well crafted methodology, and a carefully designed measurement setup.
There are a number of good books on the subject, and a huge number of papers in the literature. Try googling the topic, or search the phrase "mosfet modeling" on amazon.
The details will, as Timir notes above, depend on exactly what you are trying to calibrate. Is it for a spice type circuit model, or you trying to calibrate a tcad model?