stuck at the same weight

I have been stuck at the same weight for a lot of things for a while now. I am 5'7 and weigh 140. I am currently benching 240 for my max, and squating 315 about 3 times. Any ideas how to get my numbers up? 
For chest i do:
4x12 normal bench
4x12 incline bench 
4x12 decline bench
3x15 dumbell flys
2x max push ups

for legs:
5 sets 12 10 8 6 12 squats
4 x10 leg extensions 
4x10 hamstring curls
4x15 calf raises
3x15 leg press

thanks for the help

Switch things up, try a different routine, eat more, try a lower rep range, there are tons of things you can do. Try eating more and maybe doing less volume and try to get higher weight
Do a few sets working up to a 3rm on squat and bench, then do 1 aux lift for bench (flat/incline DB bench is a good choice) and 1-2 for legs (SLDL/Leg Curls and Calf Raises would be fine.

 "I will do today what you won't, so I can do tomorrow what you can't."
"There is no elevator to success, you must take the stairs."

is that your full routine? how often do you you do this?

full routine for those days.. i also do back, shoulder, arms, and cardio workout if thats what your asking? but i do chest and legs once a week..

Do them twice a week then. I think your problem is diet, but I think 7 days of rest is more than enough rest, and most lifts can be done more than once a week.

 "I will do today what you won't, so I can do tomorrow what you can't."
"There is no elevator to success, you must take the stairs."

yeah.. i dont diet at all i just eat whatever haha.. any advice on a diet?

What is your level of experience?

A set up like this is fine for someone with an ideal level of experience in training. But for a beginner, your best bet is to rely on bench presses alone until you develop a foundation, once you do this- You take what you have and work on what you don't have.

Example, I worked on flat benches alone for about a consistent 18 months, then I noticed that my upper chest wasn't developed nor was my lower, so I added in decline and incline presses. You first make a base, then you start the accessory stuff.

List your diet, we'll critique.

Personal Trainer/Nutrition Consultant

What helped me go up in lifts was a lot lot lot more food which = weight gain.

Compounds only; I cut out pointless isolation exercises. IMO they waste gym time.

Anddd.. Lower reps. The 12 reps stuff, you need to cut that in half and do like 5 sets of 6 on Monday, then on Friday attempt a max out. Wednesday is a recovery day.

Try the Texas Method. We have a lot of threads on it here, and google knows a little bit about it.

i have been lifting for about 3 years now.. i wish i had a diet to give you guys to help me with but i dont have one.. i will eat whatever is put in front of me or sounds good at the time