Water Volume and Use

These calculators estimate quantities of water at home or on a property. They give the volume of a fish tank or well, the septic tank size for a household, the rainwater a roof can collect and daily, monthly and yearly water use.

Tools in this group

• Aquarium Volume Calculator — Pick the fish tank shape and enter its outside dimensions to get the gallons and litres of water and the weight it puts on the stand.
• Pipe Volume Calculator — Pick a PVC size or enter the inside diameter and the length to get the water in the pipe in gallons and litres, and gallons per foot.
• Rainwater Harvesting Calculator — Enter the roof area, the rainfall and the roof material to see how much rainwater you can collect, and size a cistern from monthly rainfall and demand.
• Septic Tank Size Calculator — Enter the number of bedrooms or the daily flow to get the septic tank size in gallons and litres, with a chart for 1 to 8 bedrooms.
• Water Usage Calculator — Enter the people in the home and how you use water to estimate gallons per day, month and year, and where the water goes.
• Well Volume Calculator — Enter the casing diameter, well depth and depth to water to get the gallons in the well, the purge volume and an optional shock chlorination dose.