A pedometer is a small device that counts the number of steps you take. Several fitness programs use pedometers as progress tracking devices. A step, or stride, is picking one foot up, stepping forward and setting it back down. A pedometer should read the steps of both legs to be accurate.
Step Test
The American College of Sports Medicine recommends testing your pedometer for accuracy. Position the pedometer as instructed by the manufacturer. Make sure the pedometer sits upright and isn't leaning forward, back or to the side. Reset the counter to zero. Walk 20 steps at your normal walking pace. If your pedometer reads between 18 and 22 steps, it is fairly accurate. If it reads significantly fewer steps, it may only be measuring the motion of one leg.
Positioning Pedometer
In order for your pedometer to accurately calculate the steps you take, you must have it positioned correctly. Most pedometers need to be horizontal to the ground to work properly. Attach the device to your waistband or belt in line with the front seam of your pants. If your pants don't have a seam, line of the pedometer up with the center of your kneecap. Some pedometers have mechanisms that can sense steps even when the device is in your pocket or bag. Follow the manufacturer's instructions for properly positioning your pedometer.
Accuracy
Several factors can affect the accuracy of your pedometer. The American College of Sports Medicine reports that pedometers are most accurate at speeds above 2.5 mph. If you are a slow walker, the pedometer may have difficulty tallying your steps. Abdominal size can also affect the accuracy of a pedometer. If your abdomen pushes the pedometer into a leaning position, the device may misread your steps, depending on the type of internal counting mechanism it has.
New Pedometer
If your pedometer fails the accuracy test, try repositioning it. Make sure that you wear it according to the manufacturer instructions. If this doesn't help, you may need to get a different pedometer. Pedometers have one of two types of counting mechanisms: a lever arm or an accelerometer. Tilting or leaning affects pedometers with horizontal lever arm mechanisms more than those with accelerometers.
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