Oxycodone (contained in percocet, roxicodone, oxycontin) is about 2 times the strength of morphine (i.e., 10 mg of morphine equals 5 mg of oxycodone). Therefore, 5 mg of oxycodone is about 16 mg of hydrocodone so oxycodone is about 3 times stronger than hydrocodone. However, geminigirl is right in that everyone is different. I have read that some say hydrocodone works better for their pain than percocet and viceversa. For me, percocet works a lot better for my pain.