Discover how much money and water you can save using rainwater instead of tap water. This Rainfall Watering Savings Calculator shows lawn watering, washing cars, or bathing pets annual savings – just what green gardeners and families want! Estimate Water and Cost Savings from Rainwater Use
Rain, Rain – Don't Go Away
If you have ever sat and observed a proper Irish or British rainstorm and thought, "This is a lot of free water going down the drain," then you're correct. All that rain off your roof could be paying you back, bucket by bucket. That's where this Rainfall Watering Savings Calculator comes in handy.
What It Does
No matter if you're topping off the lawn, washing the family car, or giving your dirty dog a bath after their latest field trip, this calculator tells you how much tap water (and money) you could save per year by utilizing rainwater rather than tap water.
Just choose your activity, Lawn Watering, Car Washing, or Pet Washing, and then enter…
- How often per month you do it
- How many litres (or gallons) you typically use
- The average cost of water per litre (already pre-worked for the UK)
- Click "Calculate Savings" and you're done! You will be presented with how much litres, gallons, and pounds you can save a year.
Rainfall Watering Savings Calculator
Estimate how much water and money you save by using rainwater instead of tap water.
Why It Matters
With UK water costs averaging around £1.50–£2.75 per 1,000 litres, the savings add up quickly, especially during dry spells when your lawn or car needs extra attention. Beyond the money, using rainwater helps reduce demand on treatment plants and cuts your environmental footprint, small steps that make a big difference.
You’ll also have the satisfaction of knowing that your rain barrel isn’t just decorative. It’s your personal savings tank!
Final Word
The next you see clouds rolling in, smile, that's Mother Nature's water delivery system, courtesy of the planet! Try out this calculator throughout the year to do your own math on how much you can save and post your results in the comments below.
Have you tried rainwater yet? Post your installation or any resourceful hacks you've found for saving water, your advice may encourage others to go greener (and cost-wiser) too!
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