The Tank Volume Calculator provides instant, accurate storage capacity for vertical cylinders, horizontal cylinders, and rectangular tanks. Whether you are managing industrial water tanks, fuel drums, or storage containers, this tool delivers precise results in gallons, liters, cubic feet, and cubic meters. All calculations run 100% in your browser โ your measurements stay private. Whether you are designing a custom fish tank, calculating fuel storage requirements, or planning a water reservoir for your garden, knowing the exact volume capacity helps you make informed decisions.
How to Use This Calculator
- 1Select the shape: Choose between Vertical Cylinder, Horizontal Cylinder, or Rectangular tank.
- 2Enter dimensions: Input radius, height, length, and width as needed in feet.
- 3View results: See the volume instantly in all units โ no button to click.
- 4Copy any value: Use the Copy buttons to save individual results to your clipboard.
The Formulas Explained
For a Vertical Cylinder: Volume = ฯ ร rยฒ ร h. This calculates the base area and multiplies by height.
For a Rectangular Tank: Volume = L ร W ร H. Simple multiplication of all three dimensions.
Once volume is found in cubic feet, the tool converts to US Gallons (ร 7.48), Liters (cubic meters ร 1000), and Cubic Meters (cubic feet ร 0.0283).
Understanding Volume Units
Standard liquid measurement in the US. 1 gallon = 231 inยณ โ 3.785 liters. Used for fuel, water, and most liquids.
Metric standard used worldwide. 1 liter = 1000 cmยณ โ 0.264 gallons. Common in Europe, Asia, and science.
US customary unit. 1 ftยณ โ 7.48 gallons. Used in construction, HVAC, and shipping.
SI metric unit. 1 mยณ = 1000 liters โ 264 gallons. Standard for large-scale industrial calculations.
How It Works
The calculator supports rectangular tanks using length ร width ร height, and cylindrical tanks using ฯ ร radiusยฒ ร height. It automatically converts dimensions from your chosen unit (inches, feet, cm, meters) into volume outputs in gallons and liters. The formula is displayed for verification.
Tips for Best Results
Measure the inside dimensions (not outside) for accurate water capacity. Remember that actual fill volume is slightly less than total volume due to displacement from equipment. Use consistent units for all measurements.
Frequently Asked Questions
There are approximately 132.08 US gallons in a 500-liter tank.
Yes, the volume calculation is the same for any liquid, including water, oil, or fuel.
Simply divide the diameter by 2 to get the radius. For example, if your tank is 4 feet wide, the radius is 2 feet.
Yes, this tool is 100% free with no hidden costs, subscriptions, or limits.
Absolutely. All processing happens locally in your browser. Your data never leaves your device.
No, it calculates internal volume based on the dimensions you enter. For external tank dimensions, subtract wall thickness first.
Yes, results display simultaneously in US gallons and liters for convenience.
Currently supports rectangular (box) and cylindrical (round) tank shapes. Custom shapes may be added later.
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