Then it would perform the following calculations to work out the volume of the tank: For the final example, let’s imagine that I have an oval tank which is 7 feet long horizontally. See below for four full examples showing in detail how our calculator works. Get hassle-free estimates from local home improvement professionals and find out how much your project will cost. One gallon is equal to 0.003785 cubic meters, so use this simple formula to convert: The volume in cubic meters is equal to the gallons multiplied by 0.003785. Let’s say that I have a cylindrical oil tank which measures 7 yards in length and has a round face 5 feet in diameter (the distance across the circular end passing through the central point). The mass of one liter liquid water is almost exactly one kilogram. Now, let’s say that I want to fill the tank to a depth of 3 inches. 8,000. Are You Planning a Home Improvement Project? The calculator works out the total volume of water by doing  the following calculations: $$x = 2 × cos^{-1} \biggl({Radius – Filled\,Depth \over Radius}\biggr) = 2 × cos^{-1} \biggl({50\,cm – 1.5\,ft \over 50\,cm}\biggr) = 170.2$$, $$Radius = {Width \over 2} = {100\,cm \over 2} = 50\,cm$$, $$Filled\,Volume = {1 \over 2} × 50\,cm^2 × (170.2 – sin⁡\,170.2) × 7\,ft + (7\,ft × 1.5\,ft × (100\,cm – 4\,ft)) = 26.37\,ft^3 = 197.25\,US\,Gallons$$. The total volume of a cone bottom tank is calculated by using the formula: $$Volume = Volume\,Cylinder + Volume\,Frustrum$$, $$Volume\,Cylinder = \pi × Top\,Radius^2 × Cylinder\,Height$$, $$Volume\,Frustrum = {1 \over 3} × \pi × Frustrum\,Height × (Top\,Radius^2 + Bottom\,Radius^2 + Top\,Radius × Bottom\,Radius)$$, $$Top\,Radius = {Top\,Diameter \over 2}$$, $$Bottom\,Radius = {Bottom\,Diameter \over 2}$$. Cubic Meters to US Gallons (Liquid) formula It would perform the following calculations. The calculator would then perform the following calculations: Let’s now say that I have a water capsule tank (a cylindrical tank with circular ends) which measures 10 inches in diameter and 30 inches in horizontal side length. 1,000 Cubic Meters to Gallons (Imperial) = 219969.2483 40 Cubic Meters to Gallons (Imperial) = 8798.7699 10,000 Cubic Meters to Gallons (Imperial) = 2199692.483 The US liquid gallon is a unit of fluid volume equal to four quarts, eight pints, or sixteen cups. That’s why we built our online tank volume calculator. One cubic meter is equal to the volume of a cube with each edge measuring one meter. A metric unit of volume, commonly used in expressing concentrations of a chemical in a volume of air. To calculate the total volume of the liquid the calculator would do the following operations: $$Filled\,Volume = Length × Width × Filled\,Depth = 2\,ft × 4\,ft × 3\,in = 2\,ft^3 = 14.96\,US\,Gal$$, $$Volume= \pi × Radius^2 × \biggl(Length+ {4 × Radius \over 3}\biggr)$$, $$Volume= \pi × \biggl({10\,in \over 2}\biggr)^2 × \biggl(30\,in + {4 \over 3} × {10\,in \over 2}\biggr) = \pi × 5\,in^2 × \biggl(30\,in + {20\,in \over 3}\biggr) = 2879.793\,in^3 = 47.2\,l$$.