Few know that "better" than me. In my Excel spreadsheet, (Corner Weights and Percentages) you can enter the kart and driver weight, front weight, cross weight and left side weight and you will get the individual corner weights and percentages. Or you can put in the corner weights and get the total weight and percentages as well as the front, cross and left side weights. You can change the the total weight and the individual corner
percentages do not change. Readouts are accurate to within .01%, both percentages and weight.
Actually, I'm really surprised that more people haven't requested the program. It's free. My newest version comes with a set up sheet with the percentages and weights transferred from the first spreadsheet, and a blank set up sheet for filling out at the track. It even includes air density calculations. Putting the temperature and the barometric pressure and see your air density number immediately. That one's not free. If you're doing corner weights for friends, paid for or not, it's the perfect way to send them home with all the information. Along with a blank set up sheet they can fill in at the track by hand.