How many people did Queen Mary I have killed?

If it's Queen Mary of England(Bloody Mary)you are referring to, I think it was 287.
http://www.the-tudors.org.uk/why-was-queen-mary-tudor-known-as-bloody-mary.htm

Just realised I didn't clarify that as Queen Mary I of England, AKA Bloody Mary.

After Mary's death, Foxe's Book of Martyrs listed 284 burned at the stake, including bishops, women, two boys and even two babies. Nearly 400 more died by imprisonment and starvation. Thus the Queen earned her name "Bloody Mary." However, it should be remembered that she killed far fewer religious and political opponents per year than her tyrannical father, Henry.

http://www.christianhistorytimeline.com/DAILYF/2003/11/daily-11-30-2003.shtml