Home water use calculator
Get a rough picture of how much water your household uses each day and year, and see which activities use the most. Adjust the typical figures to match your home for a closer estimate.
The biggest household water uses
Most of the water a home uses indoors goes on a handful of everyday activities. Showering and toilet flushing are usually the two largest, simply because everyone does them every day. Laundry and the dishwasher come next, while taps for cooking, drinking and washing up make up a steady background amount. Add an outdoor garden and, in dry months, watering can rival everything inside. This calculator focuses on the main indoor uses and lets you fold general tap and kitchen use into the "other" figure.
Seeing the split as bars makes the priorities obvious. There's little point agonising over a dripping tap if your real water goes on long daily showers — and the reverse is true too. The point of the breakdown is to show you where your effort will actually pay off.
How to cut each one
Once you know where your water goes, the fixes are refreshingly simple — and most cost little or nothing. Shorter showers and a low-flow showerhead tackle the biggest use; an efficient or dual-flush toilet, or simply not flushing tissues, trims the next. Running the dishwasher and washing machine only when full cuts both water and energy, and fixing drips quickly stops a slow, invisible loss.
- Shorten showers by a couple of minutes and fit a low-flow head.
- Use a dual-flush toilet or a cistern displacement device.
- Only run the dishwasher and washing machine when full.
- Fix dripping taps and running toilets promptly.
- Fit aerators on taps and turn them off while brushing or scrubbing.
Hidden and virtual water
The water that comes out of your taps is only part of the story. Almost everything you buy — food, clothes, electronics — took water to produce, often far more than you'd guess. A single cotton shirt or a portion of beef carries a large "virtual" water footprint from the fields and factories that made it. Cutting tap use at home is worthwhile, but the choices in your shopping basket can matter just as much. Our water footprint guide explains how this hidden water adds up and where the biggest savings really lie.
Want the real number? Take a water meter reading, wait a week, then read it again. The difference is your true household use — far more accurate than any estimate, and a great baseline for tracking improvements.
Related guides & tools
Water use FAQ
How much water does a household use per day?
It varies widely by country, climate and habits, but a typical person uses somewhere in the region of 100 to 200 litres a day across showers, toilets, dishes, laundry and the kitchen. Showers and toilets are usually the two biggest indoor uses. The most reliable figure is your own water meter reading over a week.
What uses the most water in a home?
Indoors, showering and toilet flushing typically top the list, followed by laundry and the kitchen. Outdoors, garden watering can dwarf everything in summer. Older toilets and power showers use far more than efficient modern fixtures, which is why small upgrades can make a real difference.
Are the flow figures in this calculator exact?
No. They're typical example figures you can edit, not exact measurements. Shower flow, toilet and appliance volumes vary by model and country, so we let you adjust the shower flow rate and treat the rest as rough averages. Change them to match your fixtures for a closer estimate.
How can I cut my water use?
Take shorter showers, fit a low-flow showerhead and tap aerators, fix drips promptly, run dishwashers and washing machines only when full, and water the garden wisely. Each change is small on its own, but together they noticeably lower both your water use and any metered bill.
Every drop counts
You've seen where your water goes — now tackle the biggest use first. Small habits add up to real savings over a year.