12 to 14 inches is an ideal number that you should go for. You can go for more or less weight but it’s going to have an effect on your experience with your electric string trimmer. The first thing that you are going to face is as you go for a wider range, the price is going to increase. So, you should identify how much width you need before going for extra width. If you have to work with a lot of areas, you’ll need a bit more width, which will help you a lot in the process.