There is some magic involved in that calculation, because what health insurance is worth to you is not necessarily the same it is worth for the employer.
Two examples that illustrate the extreme ends of the spectrum: let's say you or a family member have a chronic or a serious illness, especially if it is a preexisting condition - for instance, cancer. In that case, health insurance can be worth literally millions of dollars to you. Even if you are a diabetic, the value of health insurance can be substantial. Sometimes, it could even make financial sense in that case to accept a very low-paying job.
On the other extreme of the scale, if you are very young and healthy, many people decide to forego insurance. In that case, the value of health insurance can be as little as the penalty (usually, 2% of your taxable income, I believe).
