Rainwater & Water-Conservation Calculators
Free, practical tools for catching and saving water at home — size a rain barrel, see where your indoor water goes, price out a drip, time an irrigation session, estimate greywater reuse, and turn savings into dollars.
Rain Barrel Calculator
Turn your roof area and local rainfall into gallons of harvestable rainwater, then see how many barrels you'd need to catch it all and how much would overflow
Household Water Use Calculator
Estimate daily, monthly, and yearly indoor water use from showers, toilets, faucets, laundry, and the dishwasher, based on typical fixture flow rates
Leak Drip Loss Calculator
Turn a dripping faucet's rate into gallons and liters lost per day, month, and year — and see why 'just a drip' adds up faster than it looks
Irrigation Timing Calculator
Work out how many minutes to run a sprinkler or drip line per session to hit a weekly watering target, from your system's measured application rate
Greywater Calculator
Estimate how many gallons of shower, bathroom-sink, and laundry water a household could realistically reuse for irrigation after accounting for system losses
Water Savings Calculator
Convert gallons saved into dollars saved on your water bill, combining your water rate with any sewer surcharge and your usage reduction