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Water & Liquid Tank Volume Calculator

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Water & Liquid Tank Volume Calculator

Calculate the total and partial-fill volume of any storage tank from a few simple dimensions. Pick the tank shape, type the dimensions in your preferred unit, and instantly read the capacity in liters, US and UK gallons, cubic meters, cubic feet, and US fluid ounces. The calculator also estimates the weight of the contained liquid based on the substance you select.

Cómo Usar

Select the Tank Shape: rectangular box, vertical or horizontal cylinder, cone frustum, or capsule.
Choose the Length Unit (meters, centimeters, millimeters, inches, or feet) so every dimension is interpreted consistently.
Enter the dimensions revealed for that shape — for example length, width and height for a rectangle, or diameter and height for a cylinder.
Arrastra el Fill Level slider to model a partially filled tank. Vertical tanks scale linearly; the horizontal cylinder uses an exact circular-segment formula.
Elige el Liquid Type to estimate weight in kilograms and pounds for the filled portion.

Características

Five tank shapes – rectangular, vertical cylinder, horizontal cylinder, cone frustum, and capsule.
Multi-unit input – mix and match meters, centimeters, millimeters, inches, or feet.
Six volume units output – liters, US gallons, UK gallons, m³, ft³, and US fluid ounces.
Partial fill modeling – horizontal cylinders use the exact segment area formula, not a linear approximation.
Liquid weight estimator – built-in densities for water, gasoline, diesel, kerosene, crude oil, vegetable oil, milk, ethanol, sea water, and mercury.
Live recalculation – every change instantly refreshes the results table.
100% del lado del cliente – your dimensions never leave the browser.

 Preguntas frecuentes

How is the volume of a horizontal cylindrical tank calculated when partially filled?

A partially filled horizontal cylinder is solved with the circular-segment formula. If r is the cylinder radius and h is the liquid depth measured from the lowest point, the wetted cross-sectional area is A = r² × arccos((r − h) / r) − (r − h) × √(2rh − h²). Multiplying that area by the cylinder length gives the filled volume. This is exact, unlike the common mistake of assuming volume scales linearly with depth.
Why is one US gallon different from one UK (Imperial) gallon?

They are two independently defined units that share a name. One US liquid gallon equals exactly 3.785411784 liters, while one UK Imperial gallon equals exactly 4.54609 liters. The Imperial gallon is roughly 20% larger, so the same tank holds a smaller number when measured in Imperial gallons. Always confirm which gallon a specification refers to, especially for fuel and chemical capacities.
What is the volume formula for a cone frustum (tapered tank)?

A cone frustum is a cone with the tip sliced off. If r₁ is the bottom radius, r₂ is the top radius, and h is the vertical height, the volume is V = (π × h / 3) × (r₁² + r₁ × r₂ + r₂²). This reduces to the cylinder formula when r₁ = r₂ and to the cone formula when r₂ = 0, which is why it is the standard choice for tapered storage vessels.
Why does liquid weight depend on density rather than volume alone?

Mass equals volume multiplied by density. One liter of fresh water weighs about 1.000 kg because water's density is 1.000 g/mL by definition. Diesel fuel at roughly 0.832 g/mL weighs only 0.832 kg per liter, while mercury at 13.534 g/mL weighs more than thirteen times as much as water. Whenever a tank's load-bearing limit matters — trucks, mezzanines, roof tanks — sizing has to use the actual liquid's density, not water's.
What is a capsule tank and how does its volume differ from a plain cylinder?

A capsule is a cylinder capped on each end by a hemisphere of the same radius. Its volume equals the cylindrical body, π × r² × (L − 2r), plus a full sphere from the two hemispheres, (4/3) × π × r³. For the same outer length and diameter a capsule therefore holds slightly more than a cylinder with flat ends, which is why pressurized vessels and propane tanks are usually built in this shape — it also distributes pressure more evenly than flat caps.