SOC and Voltage

I have a 2016 prius c and would like to slowly discharge the battery to 0% SOC so that i can eventually slow charge it with my grid charger. But i am unsure what voltage i should be dishcarging it down to.

For refernce:
What is the voltage for 100% SOC and 0% SOC ? How to calculate it ?



You can draw reference to a prius and i can apply the maths to my prius c if that make things easier for you.

thank you !