The way I read Penal Code Sections 4019(b) and 4019(c) is that for every 4 days actually served the inmate receives 2 days of conduct credit. This would be a total of 6 days credit for every 4 days served by my calculation. However, I see that many places online it is calculated as essentially half-time. And I note that PC 4019(f) says a term of four days will be deemed to have been served for every two days spent in actual custody. That seems to conflict with subsections (c) and (b) from my reading. Someone please explain using a 90 day sentence as an example. I believe the correct answer is that if an inmate receives a 90 days sentence he/she will only serve 46 days. But why is that the correct answer and not 60 days. Please explain.