Setting up your 401(k) contributions isn't rocket science, though it can feel that way, especially to those who aren't sure how much retirement will cost. There isn't a universal magic number, but there are a few pretty simple strategies you can use to come up with your retirement savings number right now.

Is your retirement forecast rainy or sunny? Do you see a green light on your road to retirement or are you stopped by a red light? Is your projected retirement age older than you’d like?