What size MMA gloves is right for my hand size?

Check out local Sporting Goods stores, or Martial Arts stores and see if they carry them. It is best to try them on before you buy. If they don't carry the gloves, ask your instructor (this is assuming you go to MMA classes) what he/she recommends. If you don't go to classes, you can email the manufacturer and ask what size works best for you. I am guessing Medium would work