Estimate your potential water savings with our precision interactive tool. Just enter your roof details and local rainfall.
Fill in the form on the left to discover how much rainwater you could be harvesting annually.
At Harvest Calculator, we believe that every drop counts. Our mission is to empower homeowners with access to precision calculation tools that turn eco-friendly ideas into real-world action.
We provide accurate metrics to help you properly size your rainwater harvesting tanks, ensuring that you optimize the catchment of your roof while preparing effectively against droughts and reducing local municipal water dependency.
Learn more about the different facets of rainwater collection systems.
Explore above-ground, underground, and slimline tank solutions perfect for residential areas.
Read MoreLearn about first-flush diverters, mesh sizes, and UV filters to keep your water safe.
Read MoreUtilize harvested rainwater for garden irrigation systems, increasing plant vitality.
Read MoreDiscover how to safely plumb rainwater to toilets and laundry to maximize savings.
Read More"This calculator helped me realize I merely needed a 500-gallon tank instead of a massive 2000-gallon one. It saved me over $1,000 on setup costs!"
"Amazingly accurate! My actual rainfall harvest this past year was incredibly close to the numbers predicted here. The website is intuitive and beautiful."
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Read ArticleUse our advanced calculator today and take the first step towards exceptional water conservation and utility independence.
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