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I usually do weights and cardio on the same day, but I was wondering if it matters whether I do the two on separate days or on the same day?

It depends what your goals are and how much time you have.

If you are aiming to improve your aerobic fitness about then you will want to do mainly cv work with 2 half hour muscle strength/endurance worth of exercises each week.

On the other hand if you are wanting to increase muscle strength and size than most of your time will be devoted to resistance work with two 30 min high intensity interval cv sessions a week.

Finally, if your gaol is overall fitness ( aerobic, muscle strength/endurance, flexibility and motor skills) then combining resistance and cv work in the sessions if ideal.

or if you are a fat ass like me:

I alternate everyday, strictly cardio days of 60 mins, and then resistance training with 20-30 min cardio at the end.

But my goals are to retain, build muscle while dropping fat.

Do weights first and then cardio after... I do both on the same day and it doesn't bother mer.

I would do weights and then some light cardio afterward to work out the lactic acid in my muscles--helps prevent being sore. Also, the least expensive recovery drink is chocolate milk and you should drink it within a half hour after training...or maybe less. Recovery is key!! Both weights and cardio can be done in the same day but I would separate them. Weights morning/cardio evening. I never lifted two days in a row though.

I work out three times a week. I don't need a ton of cardio, primarily use it as a warm-up, but I definitely do cardio and weights on the same day.

I do one hour of weight training 5-6 days per week. Then, 30 minutes of cardio after the weights on most days on the same day. My focus is mainly building muscle.

Thanks for the response guys, my goal at the moment is to lose body fat while retaining the muscle I have. I usually go to the gym 3 times a week with about 30-60 minutes resistance training followed by 30 minutes on the treadmill. Then I run 6 miles on another day. So does it matter if I do both resistance training and cardio on the same day? Or would it be better for me to do it on separate days?

If your primary goal is to lose body fat, then I don't think it matters if you do both cardio and weights on the same day. (Intense) cardio is definitely more important of the two for losing body fat, although I think diet is probably more important than anything else.

FWIW, I've been going to the gym 3-4 times a week and I do cardio and weights on the same day. My body fat is between 6-8%.