Online Tank Volume Calculator
Find the total capacity and filled volume of horizontal, vertical, oval, capsule, and elliptical tanks in several units.
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| Total Capacity | Filled Volume | 0% Full | |
|---|---|---|---|
| U.S. Gallons | 6639.39 | 3319.67 | |
| Imp. Gallons | 5528.44 | 2764.2 | |
| Liters | 25132.8 | 12566.3 | |
| Cubic Meters | 25.1328 | 12.5663 | |
| Cubic Feet | 887.556 | 443.775 |
What Is This Tool?
The Tank Volume Calculator works out how much a tank holds and how much liquid is inside at a given depth. Choose a tank shape, enter its dimensions and the filled depth, and it returns the total capacity and filled volume in US gallons, imperial gallons, liters, cubic meters, and cubic feet, plus the percentage full. It supports ten shapes, including horizontal and vertical cylinders, rectangles, ovals, capsules, and elliptical and dish-ended tanks.
How to Use This Tool?
- Select the tank shape that matches yours.
- Choose the length unit for your measurements.
- Enter the tank dimensions and the filled depth.
- Click Calculate to see the capacity and fill level.
Key Features
- Handles ten common tank shapes.
- Reports total capacity and the filled volume.
- Shows results in five different volume units at once.
- Calculates how full the tank is as a percentage.
- Accepts any length unit from millimeters to miles.
Examples
- A horizontal cylinder 8 m long and 2 m across holds about 25.13 m³.
- Filling that tank to half its diameter leaves it 50% full.
- A 1 m cube holds exactly 1 m³, or about 264 US gallons.
- A vertical cylinder fills evenly, so depth maps directly to volume.
Common Use Cases
- Estimating fuel, water, or chemical storage capacity.
- Checking how much liquid remains at a measured depth.
- Sizing tanks for agriculture or industry.
- Planning deliveries and refills from a dip reading.
- Comparing capacity across different tank shapes.
Tips & Best Practices
- Measure every dimension in the same unit.
- For cylinders, enter the diameter, not the radius.
- Keep the filled depth no greater than the tank's height or diameter.
- For an oval tank, the width and height must differ as the shape requires.
- Use the percentage-full figure as a quick sanity check.
Limitations
- It covers only the ten built-in tank shapes.
- All dimensions must be positive numbers.
- Dish-ended tanks use an approximation, so results may vary slightly.
- It assumes ideal shapes and level liquid.
Frequently Asked Questions
- What is filled depth?
- It is how deep the liquid sits in the tank, measured from the bottom, and it sets the filled volume and percentage full.
- Why are there five volume units?
- The same capacity is shown in US gallons, imperial gallons, liters, cubic meters, and cubic feet so you can use whichever suits you.
- Should I enter radius or diameter?
- Enter the diameter across the widest point of the tank, not the radius.
- Why did I get an over-filled warning?
- The filled depth was larger than the tank itself. Reduce it to at most the tank's height or diameter.
Key Terminology
- Total capacity
- The full volume a tank can hold when completely filled.
- Filled volume
- The amount of liquid in the tank at the given depth.
- Filled depth
- The vertical height of liquid measured from the bottom of the tank.
- Capsule tank
- A cylinder capped with a hemisphere at each end.
- Dish ends
- Curved end caps on a cylinder that add a little extra volume.