Tap Water Savings Calculator
Compare tap water vs bottled water costs and see how much you can save by switching. Free online tap water savings calculator with charts and breakdowns.
About This Calculator
Our tap water vs bottled water calculator helps you compare the real cost of drinking bottled water versus switching to tap water. By entering your household's daily water consumption, number of residents, local tap water rate, and the price of bottled water, you'll see exactly how much you could save every day, month, and year — plus long-term savings over 5, 10, 20, and 50 years.
The calculation is straightforward: daily consumption = water per person × number of people. Tap water cost = consumption × local tap water rate per liter. Bottled water cost = (consumption ÷ bottle capacity) × cost per bottle. The difference is your savings. Tap water is typically hundreds to thousands of times cheaper than bottled water, making it one of the easiest ways to reduce household expenses while helping the environment.
Regional Notes
India: Tap water costs approximately ₹0.01-₹0.02 per liter depending on your city and water authority. A 1-liter bottle of packaged drinking water costs ₹15-₹30. Municipal corporations in Delhi, Mumbai, Bangalore, and Chennai provide treated tap water, though boiling or filtering is recommended in many areas.
United States: Tap water costs about $0.004 per liter on average ($1.50 per 1,000 gallons). A 1-liter bottle of branded water costs $1.00-$2.50. The EPA regulates public tap water under the Safe Drinking Water Act, making it safe in most municipalities.
United Kingdom: Tap water costs approximately £0.003 per liter (£1.50-£3.00 per cubic meter). A 1-liter bottle of mineral water costs £0.50-£1.50. UK tap water is among the safest in the world, regulated by the Drinking Water Inspectorate.
Frequently Asked Questions
How does the Tap Water vs Bottled Water calculator work?
The calculator compares the daily, monthly, and annual costs of drinking tap water versus bottled water. Enter your household's daily water consumption per person, number of people, local tap water cost per liter, bottle capacity, and cost per bottle. The tool calculates your potential savings from switching to tap water.
How much money can I save by drinking tap water instead of bottled water?
Savings vary by region. In India, a family of 4 drinking 2L per person per day could save approximately ₹20,000-₹30,000 per year by switching from bottled water (₹20/L) to tap water (~₹0.01/L). In the US, a family of 3 could save $1,000-$1,500 per year. In the UK, a family of 3 could save £800-£1,200 per year. The calculator computes exact figures for your inputs.
Is tap water safe to drink instead of bottled water?
In many countries, tap water is perfectly safe and often contains more minerals than bottled water. In the US, UK, Canada, Australia, and most European countries, tap water is regulated to strict safety standards. In India, water quality varies by city — many urban areas have treated water that is safe after boiling or filtering. When in doubt, use a water filter rather than buying single-use plastic bottles.
What are the environmental benefits of drinking tap water?
Drinking tap water eliminates plastic bottle waste — a typical family of 4 switching to tap water can prevent 2,000-3,000 plastic bottles from entering landfills each year. Tap water also has a much lower carbon footprint since it avoids the manufacturing, bottling, and transportation emissions associated with bottled water.
How much tap water does a person need daily?
Health experts recommend about 2 liters (8 glasses) of water per day for women and 3 liters (12 glasses) for men, though this includes water from food and other beverages. The calculator defaults to 2 liters per person per day, which you can adjust based on your actual consumption.
What is the cost of tap water compared to bottled water per liter?
Tap water costs vary by location but is dramatically cheaper than bottled water. In India, tap water costs about ₹0.01-₹0.02 per liter while bottled water costs ₹15-₹25 per liter — tap water is 1,000-2,000 times cheaper. In the US, tap water costs about $0.004 per liter versus $1.00-$2.00 per liter for bottled water. In the UK, tap water costs about £0.003 per liter versus £0.50-£1.50 per liter for bottled water.
Can I share my tap water savings calculation?
Yes, the URL automatically saves your input values, so you can bookmark or share the exact calculation with others. Simply copy the URL after calculating your results.
What factors affect tap water vs bottled water savings?
The main factors are your household size, daily water consumption per person, local tap water cost (which varies by municipality), bottle size (typically 0.5L, 1L, or 1.5L), and cost per bottle (which varies by brand and purchase location). Bulk buying bottled water in larger packs reduces cost per liter but still costs significantly more than tap water.