Excel Checkbox

Software

im currently working on an inventory spread sheet and i want to use several check boxes, to help me out i want to be able to enter the amount of bags in stock and then have a check box for 100 lb one for 50 lb 25 lb 18 kg 30 kg well you get the picture and i want to be able to check them so that they calculate the bag number to the amount of pounds or kilograms please help me out thank you.