My asics is a good training plan, it works in both km and miles, as Hannah says. It also gives sugested timings for each mile/km based on your previous times. I have found it very helpful. Another place to look is at the Jeff Galoway plans as these are run/walk based, I used this plan and took 1hr 20mins off my marathon times (6:35 - 5:16). There are lots pf plans out there it depends on how you view your running as to which is best for you.