Shower Water Flow Calculator
Pick your shower head and routine to see the litres per shower, day and month, the hot-water share and ₹ cost, and whether your overhead tank or pump gives enough pressure. Indicative India 2026 — confirm locally.
Your shower & supply
Static pressure from an overhead tank is about 0.1 bar per metre of height (1 bar ≈ 10.2 m ≈ 33 ft of head). A rain shower typically wants ~1–1.5 bar to feel full. Cost combines water (₹/kL) and geyser heating for the hot-water share (~30 °C rise). All figures indicative — confirm locally.
Water per shower
0 L
at 15 L/min · 0 L per month for 2 showers/day
Per day
240 L
2 shower(s)
Per month
7,200 L
~30 days
Hot water / month
4,320 L
151 kWh to heat
Cost / month
₹1,530
water + geyser
Pressure is low for this head
You have ~0.6 bar from a 20 ft tank; this rain / overhead (large) head wants ~1.2 bar. You would need a tank ~40 ft high, or fit a pressure pump (~1.5 bar) for a full flow.
Switching to an aerated low-flow head (6 L/min) saves about 4,320 L and ₹918 per month on the same routine.
Monthly water use by head type at your minutes & showers/day. Indicative — confirm locally.
Right head, right pressure
Get shower head, pressure and water-saving advice for your bathroom from DesignAI.
Estimates are indicative for India 2026 and assume ~30 days a month, a ~30 °C geyser temperature rise and static (no-flow) tank pressure — real pressure drops once water flows and with pipe friction, bends and part-open taps. Flow rates vary by make and model, so confirm your head's rated litres per minute, your actual water tariff and electricity rate, and get a plumber to check pressure before buying a rain shower or pump.
Frequently asked questions
- How does the shower water flow calculator work out litres per shower?
- It multiplies your shower head flow rate in litres per minute by your minutes per shower, then scales by showers per day and about 30 days for the monthly figure. A rain head runs near 15 litres per minute, a normal fixed head near 10, a handheld near 8 and an aerated low-flow head near 6, so an 8-minute rain shower is roughly 120 litres. It also splits out the hot-water share to estimate geyser energy and adds a rough water and electricity cost.
- How much pressure does a rain shower need in India, and will my overhead tank give it?
- A large rain head usually wants about 1 to 1.5 bar to feel full, while normal and handheld heads are happy on roughly 0.4 to 0.5 bar. From an overhead tank you get about 0.1 bar for every metre of height, so 1 bar needs the tank around 10 metres or 33 feet above the shower. Many homes fall short and add a pressure pump of about 1.5 bar. The tool compares your tank height or pump against the head you picked.
- How accurate are these numbers and what should I verify?
- Treat them as indicative for planning, not exact billing. The calculator uses static no-flow pressure, so real pressure drops once water moves and with pipe friction, bends and part-open taps. Flow rates vary by make and model. Confirm your head's rated litres per minute from the manufacturer, use your actual water tariff and electricity rate, and have a plumber check pressure before buying a rain shower or booster pump.
Related Guides — Deep-dive reading
Bathroom Water Supply India: Cold & Hot Feed, Pipe Sizing, Pressure & Booster Pumps (2026)
How water actually reaches your fixtures in an Indian home — gravity-fed cold from the overhead tank, hot from the geyser, the pipe sizes that decide whether your shower gushes or dribbles, isolation valves at every fixture, booster pumps and hard-water protection, all mapped to IS 1172.
BathroomsGravity-Fed Plumbing System in India: How Overhead Tanks Push Water to Every Tap
The overhead-tank-to-fixture model that most Indian homes run on — how head height creates pressure, why the tank sits on the roof, how much pressure each floor really gets, how to size pipes for gravity flow, and exactly where gravity struggles and how to fix it.
PlumbingOverhead Shower India: Ceiling vs Wall-Arm, Head Sizes, Pressure & What It Costs (2026)
The fixed overhead shower explained for Indian homes — ceiling-mounted vs wall-arm, 150 to 300 mm head sizes, the water pressure and flow rate a good spray really needs on a gravity-fed tank, anti-clog silicone nozzles for hard water, mounting height, and how it stacks up against rain and hand showers.
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