My Distance Tracked is not Accurate.
Most Fitness Trackers track Steps and will try to equate the number of steps that you have taken to a distance you will have traveled.
Unless you have a Tracker that has a built in GPS or are using your Smartphones' GPS as a partner to your Tracker, then your device will need to work out the distance you have traveled by multiplying how far you move forward with each step you take, by the number of steps you have taken.
The distance you travel for each step is known as your Stride Length and is roughly worked out for you when you enter your body data (especially height) into your devices settings.
If you find that your distance is not as accurate as you think it should be, you may need to adjust your stride length. Please note though adjusting stride length does not alter the number of steps you are taking, only the distance your device will say you have traveled.
Generally speaking, you will need to count your steps whilst walking a known distance. You will then need to divide the distance you have traveled by the number of steps you have taken to give you your stride length.
Do ensure though that you read your manufacturers guidelines as you may need to calculate in metric or imperial units to give you the correct number to put in your settings.
Some trackers set the stride length slightly differently, they require you to walk/run a set distance and then tell the tracker how far you have travelled. Since the tracker already knows how many steps you have taken, it is able to work out your stride length itself.
You may be able to enter a different Stride Length for running, as your running stride length is probably different to your walking number.