Body fat percentage refers to the proportion of body fat weight in the whole weight of human body, also known as body fat percentage, which reflects the amount of body fat, so you may have counted it wrong. The lack of elements and water is lower than normal. Maybe you just finished exercising and haven't added anything. A little lower is no problem. It is recommended to complete the measurement before the next exercise.

Formula for calculating body fat rate of adult women:

Parameter a= waist circumference (cm) ×0.74

Parameter b= weight (kg) ×0.082+34.89.

Body fat weight (kg) = a-b

Body fat rate = (total body fat weight/body weight) × 100%