If you can access the scale’s instructions, it’s best to consult those for how to calibrate the scale. Some scales will have a calibration mode, which you can turn on, add a weighted object, and wait for some indication (such as seeing a “0”) that it’s been calibrated. Others don’t have a separate calibration button. For those, you can generally follow these steps to calibrate the scale: 1. Put the scale on a flat, hard surface, such as a hardwood or tile floor. 2. Apply some pressure to the scale (such as with your foot) until you see “0” and then take the pressure off. 3. Wait for the scale to turn off again. 4. The scale should now be calibrated and ready for you to step on for your weight.