The weight loss planner is something that you could design or utilize those that are available online. Those that are online might not be suitable for you since it might have parameters that you would not be necessarily tracking. If you do find one which you feel is perfect for the program you would be undergoing, go right ahead and get it. Most online tools do not need any mending. All of them have been created keeping the user in mind and hence does not require much alteration. Some of them would be customizable where you could just erase off those parameters you feel are not required to be there. While some of them are alterable, the others are rigid and have to be used the way it is available. It is totally up to you on which one you would like to choose. If you do not want to be spending too much time create and design a planner, just go ahead and pick one from online. Otherwise, spend some quality time in creating a planner. If you feel it would be better to use something that is more hands on and creates a better understanding for you, there is absolutely nothing that is stopping you from creating one on your own.
Both the manual and online planners come with their own pros and cons. You might want to think through all of that before you choose one for your program. Manual ones into you which you would need to fill in the data might not be very accurate since you would have to do the math. More often than not, when you are dealing with numbers, you tend to go wrong somewhere or the other. Minor errors are fine as long as it does not put your program on a halt, however major errors could actually crash your program. Since the planner is more of a motivating tool, major errors could actually demoralize you and push you to quit the weight reduction program. Most would not have the patience to calculate once again just to check if they have in fact gone wrong somewhere leading them to quit the program thinking that it is not actually working.
Use the weight loss planner in a very sensible way to obtain premium results. If you are doing it manually, make sure you use a calculator to get your deductions and additions right. You would have made yourself a great planner; you would not want to dump it just because you could not calculate right.