Our calculator tool will allow you to refine your water tank search based on your available roof dimensions and yearly rainfall average for your area. If you need any help please ensure you provide a valid email address and our team will get back to you asap. Your Name(Required) First Last Your Email(Required) Your PhoneCalculationsYou will need to provide the following measurementsRoof Length (Metres)(Required)Roof Width (Metres)(Required)Roof Height (Metres)(Required)Average Rainfall (mm)(Required)The average yearly rainfall for your areaTotal Volume (L)CAPTCHA Δ