Free Tool · Plumbing
Water Demand & Tank Size Calculator
Estimate daily water demand and the underground & overhead tank capacity your building needs, on a per-capita basis (IS 1172). Adjust the inputs, then get an engineered plumbing design from our team.
Your building
Per-capita demand from IS 1172. Final tank sizing also considers fire-water reserve, flushing split and municipal / DISCOM norms.
Underground tank—
Overhead tank—
Daily demand—
Per-capita basis—
Domestic / flushing—
Annual demand—
Get an engineered plumbing design — free
Our public-health engineers will size tanks, pumps and the distribution network for your building. We'll attach the estimate above automatically.
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Thanks! Our plumbing team will send your tailored water & tank design within one business day.
Indicative estimates only — not a binding design. Actual demand depends on occupancy pattern, fixtures, fire reserve and local bye-laws.