AreVo - easy app to calculate surface area & volume of many geometrical shapes and liquid capacity of total and filled tanks.Estimate the total and filled volumes of tanks such as oil tanks and water tanks in US gallons and litres.Tanks Shapes: Horizontal Cylinder Tank, Vertical Cylinder Tank, Rectangle Tank, Horizontal Oval Tank, Vertical Oval Tank, Horizontal Capsule Tank, Vertical Capsule Tank, Elliptical Tank.These calculations should only be considered estimates