The Rainwater Tank Size Calculator helps calculate a suitable tank capacity based on roof catchment area, location, rainfall data, and expected household water demand. It provides a practical way to size a system more confidently before moving into product selection.

By turning a few key inputs into a clearer storage recommendation, the tool helps remove guesswork from the planning process. It is ideal for homeowners, builders, and specifiers who want a more reliable starting point for rainwater storage planning.