What is the minimum number of sketches needed to create a loft?

To create a loft in SolidWorks, at least two sketches are necessary. A loft features a smooth transition between these sketches, which are typically placed on different planes or locations within the 3D space. Each sketch represents a different profile of the shape you want to create, allowing for a complex geometry that blends from one profile to the next.

The sketches can be of various shapes and sizes, and they don't necessarily have to be similar. By leveraging the loft function, you can achieve a wide range of designs, such as varied cross-sections or transitioning from one shape to another, like moving from a square base to a circular top.

Using only one sketch would not suffice because a single profile lacks the necessary variance needed to define a three-dimensional object in the lofting process. Additional sketches would only be required if you wish to add complexity, such as more profiles, or if you need to guide the loft along certain paths or surfaces, but the minimum requirement is indeed two sketches to define the fundamental loft operation.