The relationship between kilograms (kg) and gold can be expressed by the following mathematical formula: Jin = kg× 2. This formula tells us how to convert kilograms into kilograms. You can get the answer by substituting kg = 15 into the above formula. The calculation result is: 15 kg is 30 kg. So the weight of 15kg is 30 kg. In daily life, 15kg is relatively heavy and needs to be carried with both hands. If you want to feel the weight of 15kg more intuitively, you can try to lift a bag of 15kg rice by hand and feel its weight.