Water Usage Calculators
Last updated: October 2026
Water Heater Usage Calculator
Estimate your water heater's annual energy cost based on hot water demand and temperature rise.
Water Tank Sizing Calculator
Determines the minimum recommended water tank capacity for a home or commercial building based on occupant count, daily usage, desired storage duration, peak demand, and a safety buffer.
Water Pressure & Flow Calculator
Estimate the flow rate (GPM) each fixture can get when several run at once, given pipe size, supply pressure, elevation change, and pipe length.
Household Water Usage Calculator
Estimate your household's weekly water consumption from showers, toilets, laundry, and dishwashing.
Water Bill Cost Calculator
Estimates your monthly water bill using a two-tier rate structure, a fixed base charge, and a sewer multiplier β just like most municipal utilities calculate it.
Greywater Recycling Calculator
Estimate your household's weekly greywater output from showers, sinks, and laundry, then see how many gallons per person are available for garden irrigation or toilet flushing after system losses.
Lawn Irrigation Calculator
Estimate the weekly water volume required to irrigate a lawn based on its area, the grass type, and the season.
Swimming Pool Water Volume Calculator
Estimate the volume of water in a swimming pool from its length, width, average depth, and shape.
Water Leak Cost Calculator
Quantifies the water wasted and money lost from household leaks like dripping faucets and running toilets.
Hydroponic Water & Nutrient Calculator
Calculate daily water and nutrient solution consumption for your hydroponic setup based on growing area, system type, plant maturity, temperature, and light hours.
Drip Leak Water Waste Calculator
Find out how much water a dripping faucet wastes per year and what it costs you.
Car Wash Water Calculator
Estimates annual water costs for washing your vehicles by comparing home hose washing (about 150 gal), bucket washing (60 gal), commercial car washes (35 gal), professional eco washes (15 gal), and waterless or steam cleaning (about 1 gal).
Dishwasher vs Hand Washing Calculator
Compares the water a dishwasher uses with washing dishes by hand under a running tap, and shows the monthly difference in liters.
Aquarium Water Change Calculator
Determine how many gallons to change in your aquarium and how often, based on tank size, fish bioload, feeding habits, and filter quality.