Use this tool to calculate the molecular weights of chemical compounds. Enter the chemical formula of the chosen substance in the input field at the bottom of this model. Use the "up" and "down" arrows located at the side of the input field to change the mode of typing subscripts. Once the formula is in place, press "Calculate" to obtain the result (the answer in atomic weight units will appear in the main window of the model.) In this model, correctness of the elements' names is verified, however, no verification of the formula is made from the standpoint of taking the valences of all atoms into account. Note that atomic weights of the elements used in these calculations correspond to the natural occurrence of the isotopes.