Rainwater Harvesting Calculator
Rainwater Harvesting Calculator — quick estimate
Estimate how much rainwater your roof can capture each year, the storage you'd need and the tanker-water cost you'd save — RWH is mandatory in most Indian cities. Adjust the inputs, then get an engineered design.
Your catchment
Harvest = catchment area × rainfall × runoff coefficient (1 mm over 1 m² ≈ 1 litre). Recharge/storage sizing depends on a design storm and site geology.
Get an engineered rainwater harvesting design — free
Our team will design the collection, filtration, storage and recharge system for your site and handle approvals. We'll attach the estimate above automatically.
Your request is in
Thanks! Our plumbing team will send your tailored rainwater harvesting design within one business day.
Indicative estimates only — not a binding design. Actual yield depends on rainfall pattern, first-flush losses, filter efficiency and your municipal RWH bye-laws.
Need an exact BOQ, rate analysis or measurement sheet?
This is a quick engineering estimate. For tendering, billing or audit, our QS & estimation team prepares an item-wise BOQ, rate analysis and a verified measurement sheet to IS / CPWD norms — backed by 15+ years and ISO 9001:2015 quality processes.