How much water are you using at your home? Follow the easy steps below and fill in the information boxes on our Water Use Calculator to learn. Our Calculator will give you a water budget for the inside and outside of your home. A water budget tells you the right amount of water you should be using. Compare the water budget to your actual water bill and see how much water you could be saving. Then try the Water Use Calculator again with more water efficient landscaping added and see the difference in savings $ this can make.