Tank Volume Calculator
Whether you are sizing a water storage tank, estimating rainwater collection capacity, or planning a fish pond, knowing exact tank volume is essential. This calculator handles both cylindrical (round) and rectangular (box) tanks and provides volume in gallons, liters, and cubic feet with a fill time estimate.
For cylindrical tanks, the volume formula is V = π x (diameter/2)² x height. For rectangular tanks, it's simply V = length x width x depth. Results are converted to gallons using the factor of 7.48 gallons per cubic foot.
The fill time estimate helps you plan water delivery or pump sizing. A standard garden hose delivers about 5-10 GPM, while a 1-inch well pump typically delivers 10-15 GPM. Municipal water connections usually provide 15-25 GPM depending on line pressure and pipe size.
For real-world applications, keep in mind that tanks are rarely filled to 100% capacity. Most tank manufacturers recommend leaving 5-10% headspace. Underground tanks also have inlet and outlet fittings that reduce usable volume. For septic tanks and cisterns, consult local building codes for minimum capacity requirements.